View source for Accumulated cyclone energy

{{Short description|Measure of tropical cyclone activity}}
{{more citations needed|date=April 2019}}
{{use dmy dates|date=January 2024}}
[[File:2024 Accumulated Cyclone Energy Index compared to 30-year average.svg |thumb |upright=1.35 | An example ACE over the course of a single season in the Atlantic. 2024's hurricane season saw an early flareup of activity including the earliest Category 5 storm on record, an unusual mid-season pause, and a final flareup to end the season.<ref name=Axios_20241127>{{cite web |last1=Freedman |first1=Andrew |title=2024's record-breaking, destructive Atlantic hurricane season ends |url=https://www.axios.com/2024/11/27/atlantic-2024-hurricane-season-end |publisher=Axios |archive-url=https://archive.today/20241201042757/https://www.axios.com/2024/11/27/atlantic-2024-hurricane-season-end |archive-date=1 December 2024 |date=27 November 2024 |url-status=live |quote= Data: Colorado State University }}</ref>]]

'''Accumulated cyclone energy''' ('''ACE''') is a metric used to compare overall activity of [[tropical cyclones]], utilizing the available records of windspeeds at six-hour intervals to synthesize storm duration and strength into a single index value.<ref name="NWS CPC">{{cite web |title=Measuring overall activity: The Accumulated Cyclone Energy (ACE) index |url=https://www.cpc.ncep.noaa.gov/products/outlooks/hurricane2003/August/background_information.html |website=National Weather Service Climate Prediction Center |publisher=NOAA |access-date=30 January 2024}}</ref> The ACE index may refer to a single storm or to groups of storms such as those within a particular month, a full season or combined seasons.<ref>{{cite web |title=Climate Change Indicators: Tropical Cyclone Activity |url=https://www.epa.gov/climate-indicators/climate-change-indicators-tropical-cyclone-activity |website=United States Environmental Protection Agency |date=27 June 2016 |publisher=EPA |access-date=30 January 2024}}</ref> It is calculated by summing the square of tropical cyclones' [[maximum sustained winds]], as recorded every six hours, but only for windspeeds of at least tropical storm strength (≥ 34 kn; 63&nbsp;km/h; 39&nbsp;mph);<ref name="NHC Glossary">{{cite web |title=Glossary of NHC Terms|url=https://www.nhc.noaa.gov/aboutgloss.shtml |website=National Oceanic and Atmospheric Administration, National Hurricane Center and Central Pacific Hurricane Center |access-date=31 January 2024}}</ref> the resulting figure is divided by 10,000 to place it on a more manageable scale.<ref name="NWS CPC"/>

The calculation originated as the Hurricane Destruction Potential (HDP) index, which sums the squares of tropical cyclones' maximum sustained winds while at hurricane strength, at least 64 knots (≥ 119&nbsp;km/h; 74&nbsp;mph)<ref name="NHC Glossary"/> at six-hour recorded intervals across an entire season.<!-- to calculate the hurricane's destruction potential --><ref name="1988 AHS">{{cite report|title=Forecast of Atlantic Seasonal Hurricane Activity for 1988 |date=May 26, 1988 |pages=13–14 |url=https://tropical.colostate.edu/Forecast/Archived_Forecasts/1980s/1988-06.pdf|publisher=Colorado State University|author=Gray, William Mason}}</ref> The HDP index was later modified to further include tropical storms, that is, all wind speeds of at least 34 knots (≥ 63&nbsp;km/h; 39&nbsp;mph),<ref name="NHC Glossary"/> to become the ''accumulated cyclone energy'' index.<ref name="SOC 1999">{{cite journal |author1=Bell, Gerald D |author2=Halpert, Michael S|author3=Schnell, Russell C|author4=Higgins, R. Wayne|author5=Lawrimore, Jay|author6=Kousky, Vernon E|author7=Tinker, Richard|author8=Thiaw, Wasila |author9=Chelliah, Muthuvel| author10=Artusa, Anthony|title=Climate Assessment for 1999|journal = Bulletin of the American Meteorological Society| date = June 2000|volume =81|issue=6|pages=S19|doi=10.1175/1520-0477(2000)81[s1:CAF]2.0.CO;2|doi-access=free}}</ref>

The highest ACE calculated for a single tropical cyclone on record worldwide is 87.01, set by [[Cyclone Freddy]] in 2023.<ref>{{cite web |title=Real-Time Southern Hemisphere Statistics by Storm for 2022/2023 |url=http://tropical.atmos.colostate.edu/Realtime/index.php?loc=southernhemisphere |url-status=live |archive-url=https://web.archive.org/web/20230311184841/http://tropical.atmos.colostate.edu/Realtime/index.php?loc=southernhemisphere |archive-date=11 March 2023 |access-date=11 March 2023 |publisher=Colorado State University}}</ref>

==History==
The ACE index is an offshoot of Hurricane Destruction Potential (HDP), an index created in 1988 by [[William M. Gray|William Gray]] and his associates at [[Colorado State University]]<ref name="1988 AHS" /> who argued the destructiveness of a hurricane's wind and storm surge is better related to the square of the maximum wind speed (<math>v_\max^2</math>)
than simply to the maximum wind speed (<math>v_\max</math>).<ref name="1988 AHS" /> The HDP index is calculated by squaring the estimated maximum sustained wind speeds for tropical cyclones while at hurricane strength, that is, wind speeds of at least 64 knots (≥ 119&nbsp;km/h; 74&nbsp;mph).<ref name="NHC Glossary"/> The squared windspeeds from six-hourly recorded intervals are then summed across an entire season.<ref name="SOC 1999"/><ref name="1988 AHS" /> This scale was subsequently modified in 1999 by the United States [[National Oceanic and Atmospheric Administration]] (NOAA) to include not only hurricanes but also tropical storms, that is, all cyclones while windspeeds are at least 34 knots (≥ 63&nbsp;km/h; 39&nbsp;mph).<ref name="NHC Glossary"/> Since the calculation was more broadly adjusted by NOAA, the index has been used in a number of different ways such as to compare individual storms, and by various agencies and researchers including the Australian [[Bureau of Meteorology]] and the [[India Meteorological Department]].<ref name="Variation" /><ref>{{cite report|title=Weekly Tropical Climate Note July 14, 2020 |url=http://www.bom.gov.au/climate/tropical-note/archive/20200714.archive.shtml|publisher=Australian Bureau of Meteorology|access-date=September 4, 2020|date=July 14, 2020|archive-url=https://web.archive.org/web/20200904160004/http://www.bom.gov.au/climate/tropical-note/archive/20200714.archive.shtml|archive-date=September 4, 2020|url-status=live}}</ref> The purposes of the ACE index include to categorize how active tropical cyclone seasons were as well as to identify possible long-term trends in a certain area such as the Lesser Antilles.<ref name="background">{{cite web |last=Lea, Wood |first=Adam, Nick |date=May 5, 2023 |title=Early May Forecast for Northwest Pacific Typhoon Activity in 2023 |url=https://www.tropicalstormrisk.com/docs/TSRNWPForecastMay2023.pdf |archive-url= |archive-date= |access-date= |publisher=Tropical Storm Risk.com}}</ref>

==Calculation==
''Accumulated cyclone energy'' is calculated by summing the squares of the estimated maximum sustained velocity of tropical cyclones when wind speeds are at least tropical storm strength (≥ 34 kn; 63&nbsp;km/h; 39&nbsp;mph)<ref name="NHC Glossary"/> at recorded six-hour intervals. The sums are usually divided by 10,000 to make them more manageable.  One unit of ACE equals {{nowrap | 10<sup>−4</sup>&nbsp;[[Knot (unit)|kn]]<sup>2</sup>,}} and for use as an index the unit is assumed.  Thus:

: <math>\text{ACE} = 10^{-4} \sum v_\max^2</math>     (for <math>v_\max</math> ≥ 34 kn),

where <math>v_\max</math> is estimated sustained wind speed in [[knot (unit)|knots]] at six-hour intervals.<ref name="SOC 1999"/>

[[Kinetic energy]] is proportional to the square of velocity. However, unlike the measure defined above, kinetic energy is also proportional to the mass <math>m</math>(corresponding to the size of the storm) and represents an integral of force equal to mass times acceleration, <math>F = m \times a</math>, where acceleration is the antiderivative of velocity, or <math>v_\max</math>.  The integral is a difference at the limits of the square antiderivative, rather than a sum of squares at regular intervals. Thus, the term applied to the index, ''accumulated cyclone energy'', is a misnomer since the index is neither a measure of kinetic energy nor "accumulated energy."

==Atlantic Ocean==
[[File:Accumulated Cyclone Energy of North Atlantic hurricanes, OWID multilingual.svg|thumb|upright=1.4|Accumulated cyclone energy of North Atlantic hurricanes.<ref>{{cite web |title= BACKGROUND INFORMATION: NORTH ATLANTIC HURRICANE SEASON |url= https://www.cpc.ncep.noaa.gov/products/outlooks/Background.html|website= NOAA CPC|access-date=15 February 2020}}</ref>]]
{{main|Atlantic hurricane season}}
Within the Atlantic Ocean, the United States [[National Oceanic and Atmospheric Administration]] and others use the ACE index of a season to classify the season into one of four categories.<ref>{{cite web |title= BACKGROUND INFORMATION: NORTH ATLANTIC HURRICANE SEASON |url= https://www.cpc.ncep.noaa.gov/products/outlooks/Background.html|website= NOAA CPC|access-date=15 February 2020}}</ref> These four categories are extremely active, above-normal, near-normal, and below-normal, and are worked out using an approximate quartile partitioning of seasons based on the ACE index over the 70 years between 1951 and 2020.<ref>{{cite web |title= BACKGROUND INFORMATION: NORTH ATLANTIC HURRICANE SEASON |url= https://www.cpc.ncep.noaa.gov/products/outlooks/Background.html|website= NOAA CPC|access-date=15 February 2020}}</ref> The median value of the ACE index from 1951 to 2020 is 96.7 x 10<sup>4</sup> kt<sup>2</sup><ref>{{cite web |title= BACKGROUND INFORMATION: NORTH ATLANTIC HURRICANE SEASON |url= https://www.cpc.ncep.noaa.gov/products/outlooks/Background.html|website= NOAA CPC|access-date=15 February 2020}}</ref>


{| class="wikitable"
|+ Classification criteria
! Category !! ACE Index [kt<sup>2</sup>] !! % of 1951–2020<br>median
|-
| Extremely active || > 159.6 || > 165%
|-
| Above-normal || 126.1–159.6 || 130%–165%
|-
| Near-normal || 73.0–126.1 || 75%–130%
|-
| Below-normal || < 73.0 || < 75%
|-
| colspan=6 style="text-align:center;" |'''Reference:'''<ref>{{cite web |title= BACKGROUND INFORMATION: NORTH ATLANTIC HURRICANE SEASON |url= https://www.cpc.ncep.noaa.gov/products/outlooks/Background.html|website= NOAA CPC|access-date=15 February 2020}}</ref>
|}

{| class="wikitable sortable"
|+ Top 10 Atlantic hurricane seasons
! scope="col" | Season
! scope="col" | [[Tropical cyclone#Tropical storm|TS]]
! scope="col" | [[Tropical cyclone scales#Atlantic, Eastern and Central Pacific|HU]]
! scope="col" | [[Tropical cyclone scales#Atlantic, Eastern and Central Pacific|MH]]
! scope="col" | ACE
|-
| [[1933 Atlantic hurricane season|1933]] || 20 || 11 || 6 || 258.57
|-
| [[2005 Atlantic hurricane season|2005]] || 28 || 15 || 7 || 245.3
|-
| [[1893 Atlantic hurricane season|1893]] || 12 || 10 || 5 || 231.15
|-
| [[1926 Atlantic hurricane season|1926]] || 11 || 8 || 6 || 229.56
|-
| [[1995 Atlantic hurricane season|1995]] || 19 || 11 || 5 || 227.10
|-
| [[2004 Atlantic hurricane season|2004]] || 15 || 9 || 6 || 226.88
|-
| [[2017 Atlantic hurricane season|2017]] || 17 || 10 || 6 || 224.88
|-
| [[1950 Atlantic hurricane season|1950]] || 16 || 11 || 6 || 211.28
|-
| [[1961 Atlantic hurricane season|1961]] || 12 || 8  || 5 || 188.9
|-
| [[1998 Atlantic hurricane season|1998]] || 14 || 10 || 3 || 181.76
|}

===Individual storms in the Atlantic===
The highest ever ACE estimated for a single storm in the Atlantic is 73.6, for the [[1899 San Ciriaco hurricane|San Ciriaco hurricane]] in [[1899 Atlantic hurricane season|1899]]. A Category 4 hurricane which lasted for four weeks, this single storm had an ACE higher than many whole Atlantic storm seasons. Other Atlantic storms with high ACEs include [[Hurricane Ivan]] in [[2004 Atlantic hurricane season|2004]], with an ACE of 70.4, [[Hurricane Irma]] in [[2017 Atlantic hurricane season|2017]], with an ACE of 64.9,<!--Please refer to Talk:2017 Atlantic hurricane season/ACE calcs--> the [[1893 Great Charleston hurricane|Great Charleston Hurricane in 1893]], with an ACE of 63.5, [[Hurricane Isabel]] in [[2003 Atlantic hurricane season|2003]], with an ACE of 63.3, and the [[1932 Cuba hurricane]], with an ACE of 59.8.{{Atlantic hurricane best track}}

Since 1950, the highest ACE of a tropical storm was [[Tropical Storm Philippe (2023)|Tropical Storm Philippe]] in [[2023 Atlantic hurricane season|2023]], which attained an ACE of 9.4.<ref>{{Cite web |title=Real-Time North Atlantic Ocean Statistics compared with climatology |url=http://tropical.atmos.colostate.edu/Realtime/index.php?loc=northatlantic |access-date=2023-10-05 |website=tropical.atmos.colostate.edu}}</ref> The highest ACE of a Category 1&nbsp;hurricane was [[Hurricane Nadine (2012)|Hurricane Nadine]] in [[2012 Atlantic hurricane season|2012]], which attained an ACE of 26.3. The record for lowest ACE of a tropical storm is jointly held by [[2000 Atlantic hurricane season#Tropical Storm Chris|Tropical Storm Chris]] in [[2000 Atlantic hurricane season|2000]] and [[Tropical Storm Philippe (2017)|Tropical Storm Philippe]] in [[2017 Atlantic hurricane season|2017]], both of which were tropical storms for only six hours and had an ACE of just 0.1225. The lowest ACE of any hurricane was [[2005 Atlantic hurricane season|2005]]'s [[Hurricane Cindy (2005)|Hurricane Cindy]], which was only a hurricane for six hours, and [[2007 Atlantic hurricane season|2007]]'s [[Hurricane Lorenzo (2007)|Hurricane Lorenzo]], which was a hurricane for twelve hours; Cindy had an ACE of just 1.5175 and Lorenzo had a lower ACE of only 1.475. The lowest ACE of a major hurricane (Category&nbsp;3 or higher), was [[Hurricane Gerda]] in [[1969 Atlantic hurricane season|1969]], with an ACE of 5.3.<ref name="Individual ACE">{{cite web|title=Atlantic hurricanes by ACE - 1950-2012|url=http://policlimate.com/tropical/atlantic_storms_ace_maxw.dat|website=Policlimate|access-date=7 August 2017|archive-url=https://web.archive.org/web/20170810205229/http://policlimate.com/tropical/atlantic_storms_ace_maxw.dat|archive-date=10 August 2017|url-status=dead}}</ref>
The following table shows those storms in the Atlantic basin from 1851–2021 that have attained over 50 points of ACE.<ref name="Individual ACE"/>

{| class="wikitable sortable"
!Storm
!Year
![[Saffir–Simpson scale|Peak classification]]
!ACE
!Duration
|-
|[[1899 San Ciriaco hurricane|Hurricane Three]]
|[[1899 Atlantic hurricane season|1899]]
|bgcolor=#{{storm colour|4}}|{{center|Category&nbsp;4 hurricane}}
|73.6
|28 days
|-
|[[Hurricane Ivan]]
|[[2004 Atlantic hurricane season|2004]]
|bgcolor=#{{storm colour|5}}|{{center|Category&nbsp;5 hurricane}}
|70.4
|23 days
|-
|[[Hurricane Irma]]
|[[2017 Atlantic hurricane season|2017]]
|bgcolor=#{{storm colour|5}}|{{center|Category&nbsp;5 hurricane}}
|64.9<!--Please refer to Talk:2017 Atlantic hurricane season/ACE calcs-->
|13 days
|-
|[[1893 Great Charleston hurricane|Hurricane Nine]]
|[[1893 Atlantic hurricane season|1893]]
|bgcolor=#{{storm colour|3}}|{{center|Category&nbsp;3 hurricane}}
|63.5
|20 days
|-
|[[Hurricane Isabel]]
|[[2003 Atlantic hurricane season|2003]]
|bgcolor=#{{storm colour|5}}|{{center|Category&nbsp;5 hurricane}}
|63.3
|14 days
|-
|[[1932 Cuba hurricane|Hurricane Fourteen]]
|[[1932 Atlantic hurricane season|1932]]
|bgcolor=#{{storm colour|5}}|{{center|Category&nbsp;5 hurricane}}
|59.8
|15 days
|-
|[[Hurricane Donna]]
|[[1960 Atlantic hurricane season|1960]]
|bgcolor=#{{storm colour|4}}|{{center|Category&nbsp;4 hurricane}}
|57.6
|16 days
|-
|[[Hurricane Carrie]]
|[[1957 Atlantic hurricane season|1957]]
|bgcolor=#{{storm colour|4}}|{{center|Category&nbsp;4 hurricane}}
|55.8
|21 days
|-
|[[Hurricane Inez]]
|[[1966 Atlantic hurricane season|1966]]
|bgcolor=#{{storm colour|5}}|{{center|Category&nbsp;5 hurricane}}
|54.6
|21 days
|-
|[[Hurricane Sam]]
|[[2021 Atlantic hurricane season|2021]]
|bgcolor=#{{storm colour|4}}|{{center|Category&nbsp;4 hurricane}}
|53.8
|14 days
|-
|[[Hurricane Luis]]
|[[1995 Atlantic hurricane season|1995]]
|bgcolor=#{{storm colour|4}}|{{center|Category&nbsp;4 hurricane}}
|53.7
|15 days
|-
|[[Hurricane Allen]]
|[[1980 Atlantic hurricane season|1980]]
|bgcolor=#{{storm colour|5}}|{{center|Category&nbsp;5 hurricane}}
|52.3
|12 days
|-
|[[Hurricane Esther]]
|[[1961 Atlantic hurricane season|1961]]
|bgcolor=#{{storm colour|5}}|{{center|Category&nbsp;5 hurricane}}
|52.2
|18 days
|-
|[[Hurricane Matthew]]
|[[2016 Atlantic hurricane season|2016]]
|bgcolor={{storm colour|5}}|{{center|Category&nbsp;5 hurricane}}
|50.9
|12 days
|-
|}

===Historical ACE in recorded Atlantic hurricane history===
<div style="float:right;padding-top:1em">
{{ #invoke:Chart | bar chart
| delimiter = /
| group 1 =
  211
/ 127
/ 87
/ 104
/ 113
/ 165
/ 54
/ 84
/ 121
/ 77
/ 88
/ 189
/ 36
/ 118
/ 154
/ 84
/ 145
/ 122
/ 35
/ 166
/ 34
/ 97
/ 28
/ 43
/ 61
/ 73
/ 81
/ 25
/ 62
/ 91
/ 147
/ 93
/ 29
/ 17
/ 71
/ 88
/ 36
/ 34
/ 103
/ 135
/ 91
/ 34
/ 75
/ 39
/ 32
/ 228
/ 166
/ 40
/ 182
/ 176
/ 116
/ 106
/ 67
/ 177
/ 227
/ 245
/ 79
/ 72
/ 144
/ 53
/ 165
/ 126
/ 132
/ 36
/ 67
/ 63
/ 142
/ 225
/ 132
/ 132
/ 180
/ 145
/ 93
/ 139
/ 160
| tooltip 1 =
  1950: 211
/ 1951: 127
/ 1952: 87
/ 1953: 104
/ 1954: 113
/ 1955: 165
/ 1956: 54
/ 1957: 84
/ 1958: 121
/ 1959: 77
/ 1960: 88
/ 1961: 189
/ 1962: 36
/ 1963: 118
/ 1964: 153
/ 1965: 84
/ 1966: 145
/ 1967: 122
/ 1968: 35
/ 1969: 149
/ 1970: 34
/ 1971: 97
/ 1972: 28
/ 1973: 43
/ 1974: 61
/ 1975: 73
/ 1976: 81
/ 1977: 25
/ 1978: 62
/ 1979: 91
/ 1980: 148
/ 1981: 93
/ 1982: 29
/ 1983: 17
/ 1984: 71
/ 1985: 88
/ 1986: 36
/ 1987: 34
/ 1988: 103
/ 1989: 135
/ 1990: 91
/ 1991: 34
/ 1992: 75
/ 1993: 39
/ 1994: 32
/ 1995: 228
/ 1996: 166
/ 1997: 40
/ 1998: 182
/ 1999: 177
/ 2000: 116
/ 2001: 106
/ 2002: 67
/ 2003: 176
/ 2004: 227
/ 2005: 245
/ 2006: 79
/ 2007: 72
/ 2008: 144
/ 2009: 53
/ 2010: 165
/ 2011: 126
/ 2012: 132
/ 2013: 36
/ 2014: 67
/ 2015: 63
/ 2016: 141
/ 2017: 225
/ 2018: 132
/ 2019: 132
/ 2020: 180
/ 2021: 146
/ 2022: 93
/ 2023: 139
/ 2024: 161
| group names = Accumulated Cyclone Energy
| x legends = 1950 ////////// 1960 ////////// 1970 ////////// 1980 ////////// 1990 ////////// 2000 ////////// 2010 ////////// 2020 ////
}}
</div>
There is an undercount bias of tropical storms, hurricanes, and major hurricanes before the satellite era (prior to the mid–1960s), due to the difficulty in identifying storms.

'''Classification criteria'''
{{legend|Salmon|Extremely active|border=solid 1px #AAAAAA}}
{{legend|Gold|Above-normal|border=solid 1px #AAAAAA}}
{{legend|White|Near-normal|border=solid 1px #AAAAAA}}
{{legend|Cyan|Below-normal|border=solid 1px #AAAAAA}}
{| class="wikitable sortable mw-collapsible"
|+ Accumulated Cyclone Energy - Atlantic <ref>{{cite web |title=Real-Time Tropical Cyclone North Atlantic Ocean Statistics |url=https://tropical.atmos.colostate.edu/Realtime/index.php?arch&loc=northatlantic |url-status=live |archive-url=https://web.archive.org/web/20231129211326/https://tropical.atmos.colostate.edu/Realtime/ |archive-date=November 29, 2023 |access-date=April 29, 2024 |publisher=Colorado State University |location=Fort Collins, Colorado}}</ref>
! scope="col" | Season
! scope="col" | ACE
! scope="col" | [[Tropical cyclone#Tropical storm|TS]]
! scope="col" | [[Tropical cyclone scales#Atlantic, Eastern and Central Pacific|HU]]
! scope="col" | [[Tropical cyclone scales#Atlantic, Eastern and Central Pacific|MH]]
! scope="col" | Classification
|- style="background:Cyan;"
|[[1851 Atlantic hurricane season|1851]]
|36.24
|6
|3
|1
|Below normal
|-
|[[1852 Atlantic hurricane season|1852]]
|73.28
|5
|5
|1
|Near normal
|-
|[[1853 Atlantic hurricane season|1853]]
|76.49
|8
|4
|2
|Near normal
|- style="background:Cyan;"
|[[1854 Atlantic hurricane season|1854]]
|31.00
|5
|3
|1
|Below normal
|- style="background:Cyan;"
|[[1855 Atlantic hurricane season|1855]]
|18.12
|5
|4
|1
|Below normal
|- style="background:Cyan;"
|[[1856 Atlantic hurricane season|1856]]
|48.94
|6
|4
|2
|Below normal
|- style="background:Cyan;"
|[[1857 Atlantic hurricane season|1857]]
|46.84
|4
|3
|0
|Below normal
|- style="background:Cyan;"
|[[1858 Atlantic hurricane season|1858]]
|44.79
|6
|6
|0
|Below normal
|- style="background:Cyan;"
|[[1859 Atlantic hurricane season|1859]]
|55.73
|8
|7
|1
|Below normal
|- style="background:Cyan;"
|[[1860 Atlantic hurricane season|1860]]
|62.06
|7
|6
|1
|Below normal
|- style="background:Cyan;"
|[[1861 Atlantic hurricane season|1861]]
|49.71
|8
|6
|0
|Below normal
|- style="background:Cyan;"
|[[1862 Atlantic hurricane season|1862]]
|46.03
|6
|3
|0
|Below normal
|- style="background:Cyan;"
|[[1863 Atlantic hurricane season|1863]]
|50.35
|9
|5
|0
|Below normal
|- style="background:Cyan;"
|[[1864 Atlantic hurricane season|1864]]
|26.55
|5
|3
|0
|Below normal
|- style="background:Cyan;"
|[[1865 Atlantic hurricane season|1865]]
|49.13
|7
|3
|0
|Below normal
|-
|[[1866 Atlantic hurricane season|1866]]
|83.65
|7
|6
|1
|Near normal
|- style="background:Cyan;"
|[[1867 Atlantic hurricane season|1867]]
|59.97
|9
|7
|1
|Below normal
|- style="background:Cyan;"
|[[1868 Atlantic hurricane season|1868]]
|34.65
|4
|3
|0
|Below normal
|- style="background:Cyan;"
|[[1869 Atlantic hurricane season|1869]]
|51.02
|10
|7
|1
|Below normal
|-
|[[1870 Atlantic hurricane season|1870]]
|87.8
|11
|10
|2
|Near normal
|-
|[[1871 Atlantic hurricane season|1871]]
|88.39
|8
|6
|2
|Near normal
|- style="background:Cyan;"
|[[1872 Atlantic hurricane season|1872]]
|65.38
|5
|4
|0
|Below normal
|- style="background:Cyan;"
|[[1873 Atlantic hurricane season|1873]]
|69.47
|5
|3
|2
|Below normal
|- style="background:Cyan;"
|[[1874 Atlantic hurricane season|1874]]
|47.05
|7
|4
|0
|Below normal
|- style="background:Cyan;"
|[[1875 Atlantic hurricane season|1875]]
|72.48
|6
|5
|1
|Below normal
|- style="background:Cyan;"
|[[1876 Atlantic hurricane season|1876]]
|56.05
|5
|4
|2
|Below normal
|-
|[[1877 Atlantic hurricane season|1877]]
|73.36
|8
|3
|1
|Near normal
|- style="background:Salmon;"
|[[1878 Atlantic hurricane season|1878]]
|180.85
|12
|10
|2
|Extremely active
|- style="background:Cyan;"
|[[1879 Atlantic hurricane season|1879]]
|63.63
|8
|6
|2
|Below normal
|- style="background:Gold;"
|[[1880 Atlantic hurricane season|1880]]
|131.08
|11
|9
|2
|Above normal
|- style="background:Cyan;"
|[[1881 Atlantic hurricane season|1881]]
|59.25
|7
|4
|0
|Below normal
|- style="background:Cyan;"
|[[1882 Atlantic hurricane season|1882]]
|59.4675
|6
|4
|2
|Below normal
|-style="background:Cyan;"
|[[1883 Atlantic hurricane season|1883]]
|66.7
|4
|3
|2
|Below normal
|-style="background:Cyan;"
|[[1884 Atlantic hurricane season|1884]]
|72.06
|4
|4
|1
|Below normal
|- style="background:Cyan;"
|[[1885 Atlantic hurricane season|1885]]
|58.3
|8
|6
|0
|Below normal
|- style="background:Salmon;"
|[[1886 Atlantic hurricane season|1886]]
|166.165
|12
|10
|4
|Extremely active
|- style="background:Salmon;"
|[[1887 Atlantic hurricane season|1887]]
|181.26
|19
|11
|2
|Extremely active
|-
|[[1888 Atlantic hurricane season|1888]]
|84.945
|9
|6
|2
|Near normal
|-
|[[1889 Atlantic hurricane season|1889]]
|104.0425
|9
|6
|0
|Near normal
|- style="background:Cyan;"
|[[1890 Atlantic hurricane season|1890]]
|33.345
|4
|2
|1
|Below normal
|-
|[[1891 Atlantic hurricane season|1891]]
|116.105
|10
|7
|1
|Near normal
|-
|[[1892 Atlantic hurricane season|1892]]
|115.8375
|9
|5
|0
|Near normal
|- style="background:Salmon;"
|[[1893 Atlantic hurricane season|1893]]
|231.1475
|12
|10
|5
|Extremely active
|- style="background:Gold;"
|[[1894 Atlantic hurricane season|1894]]
|135.42
|7
|5
|4
|Above normal
|- style="background:Cyan;"
|[[1895 Atlantic hurricane season|1895]]
|68.765
|6
|2
|0
|Below normal
|- style="background:Gold;"
|[[1896 Atlantic hurricane season|1896]]
|136.0825
|7
|6
|2
|Above normal
|- style="background:Cyan;"
|[[1897 Atlantic hurricane season|1897]]
|54.54
|6
|3
|0
|Below normal
|- 
|[[1898 Atlantic hurricane season|1898]]
|113.2375
|11
|5
|1
|Near Normal
|-
|- style="background:gold;"
|[[1899 Atlantic hurricane season|1899]]
|151.025
|10
|5
|2
|Above normal
|-
|[[1900 Atlantic hurricane season|1900]]
|83.345
|7
|3
|2
|Near normal
|- 
|[[1901 Atlantic hurricane season|1901]]
|98.975
|13
|6
|0
|Near normal
|- style="background:Cyan;"
|[[1902 Atlantic hurricane season|1902]]
|32.65
|5
|3
|0
|Below normal
|-
|[[1903 Atlantic hurricane season|1903]]
|102.07
|10
|7
|1
|Near normal
|- style="background:Cyan;"
|[[1904 Atlantic hurricane season|1904]]
|30.345
|6
|4
|0
|Below normal
|- style="background:Cyan;"
|[[1905 Atlantic hurricane season|1905]]
|28.3775
|5
|1
|1
|Below normal
|- style="background:Salmon;"
|[[1906 Atlantic hurricane season|1906]]
|162.88
|11
|6
|3
|Extremely active
|- style="background:Cyan;"
|[[1907 Atlantic hurricane season|1907]]
|13.06
|5
|0
|0
|Below normal
|-
|[[1908 Atlantic hurricane season|1908]]
|95.11
|10
|6
|1
|Near normal
|-
|[[1909 Atlantic hurricane season|1909]]
|93.34
|12
|6
|4
|Near normal
|- style="background:Cyan;"
|[[1910 Atlantic hurricane season|1910]]
|63.9
|5
|3
|1
|Below normal
|- style="background:Cyan;"
|[[1911 Atlantic hurricane season|1911]]
|34.2875
|6
|3
|0
|Below normal
|- style="background:Cyan;"
|[[1912 Atlantic hurricane season|1912]]
|57.2625
|7
|4
|1
|Below normal
|- style="background:Cyan;"
|[[1913 Atlantic hurricane season|1913]]
|35.595
|6
|4
|0
|Below normal
|- style="background:Cyan;"
|[[1914 Atlantic hurricane season|1914]]
|2.53
|1
|0
|0
|Below normal
|- style="background:Gold;"
|[[1915 Atlantic hurricane season|1915]]
|130.095
|6
|5
|3
|Above normal
|- style="background:Gold;"
|[[1916 Atlantic hurricane season|1916]]
|144.0125
|15
|10
|5
|Above normal
|- style="background:Cyan;"
|[[1917 Atlantic hurricane season|1917]]
|60.6675
|4
|2
|2
|Below normal
|- style="background:Cyan;"
|[[1918 Atlantic hurricane season|1918]]
|39.8725
|6
|4
|1
|Below normal
|- style="background:Cyan;"
|[[1919 Atlantic hurricane season|1919]]
|55.04
|5
|2
|1
|Below normal
|- style="background:Cyan;"
|[[1920 Atlantic hurricane season|1920]]
|29.81
|5
|4
|0
|Below normal
|-
|[[1921 Atlantic hurricane season|1921]]
|86.53
|7
|5
|2
|Near normal
|- style="background:Cyan;"
|[[1922 Atlantic hurricane season|1922]]
|54.515
|5
|3
|1
|Below normal
|- style="background:Cyan;"
|[[1923 Atlantic hurricane season|1923]]
|49.31
|9
|4
|1
|Below normal
|-
|[[1924 Atlantic hurricane season|1924]]
|100.1875
|11
|5
|2
|Near normal
|- style="background:Cyan;"
|[[1925 Atlantic hurricane season|1925]]
|7.2525
|4
|1
|0
|Below normal
|- style="background:Salmon;"
|[[1926 Atlantic hurricane season|1926]]
|229.5575
|11
|8
|6
|Extremely active
|- style="background:Cyan;"
|[[1927 Atlantic hurricane season|1927]]
|56.4775
|8
|4
|1
|Below normal
|-
|[[1928 Atlantic hurricane season|1928]]
|83.475
|6
|4
|1
|Near normal
|- style="background:Cyan;"
|[[1929 Atlantic hurricane season|1929]]
|48.0675
|5
|3
|1
|Below normal
|- style="background:Cyan;"
|[[1930 Atlantic hurricane season|1930]]
|49.7725
|3
|2
|2
|Below normal
|- style="background:Cyan;"
|[[1931 Atlantic hurricane season|1931]]
|47.835
|13
|3
|1
|Below normal
|- style="background:Salmon;"
|[[1932 Atlantic hurricane season|1932]]
|169.6625
|15
|6
|4
|Extremely active
|- style="background:Salmon;"
|[[1933 Atlantic hurricane season|1933]]
|258.57
|20
|11
|6
|Extremely active
|-
|[[1934 Atlantic hurricane season|1934]]
|79.0675
|13
|7
|1
|Near normal
|-
|[[1935 Atlantic hurricane season|1935]]
|106.2125
|8
|5
|3
|Near normal
|-
|[[1936 Atlantic hurricane season|1936]]
|99.775
|17
|7
|1
|Near normal
|- style="background:Cyan;"
|[[1937 Atlantic hurricane season|1937]]
|65.85
|11
|4
|1
|Below normal
|-
|[[1938 Atlantic hurricane season|1938]]
|77.575
|9
|4
|2
|Near normal
|- style="background:Cyan;"
|[[1939 Atlantic hurricane season|1939]]
|43.6825
|6
|3
|1
|Below normal
|-style="background:Cyan;"
|[[1940 Atlantic hurricane season|1940]]
|67.79
|9
|6
|0
|Below normal
|- style="background:Cyan;"
|[[1941 Atlantic hurricane season|1941]]
|51.765
|6
|4
|3
|Below normal
|- style="background:Cyan;"
|[[1942 Atlantic hurricane season|1942]]
|62.485
|11
|4
|1
|Below normal
|-
|[[1943 Atlantic hurricane season|1943]]
|94.01
|10
|5
|2
|Near normal
|-
|[[1944 Atlantic hurricane season|1944]]
|104.4525
|14
|8
|3
|Near normal
|- style="background:Cyan;"
|[[1945 Atlantic hurricane season|1945]]
|63.415
|11
|5
|2
|Below normal
|- style="background:Cyan;"
|[[1946 Atlantic hurricane season|1946]]
|19.6125
|7
|3
|0
|Below normal
|-
|[[1947 Atlantic hurricane season|1947]]
|88.49
|10
|5
|2
|Near normal
|-
|[[1948 Atlantic hurricane season|1948]]
|94.9775
|10
|6
|4
|Near normal
|-
|[[1949 Atlantic hurricane season|1949]]
|96.4475
|16
|7
|2
|Near normal
|- style="background:Salmon;"
|[[1950 Atlantic hurricane season|1950]]
|211.2825
|16
|11
|6
|Extremely active
|- style="background:Gold;"
|[[1951 Atlantic hurricane season|1951]]
|126.325
|12
|8
|3
|Above normal
|- style="background:Cyan;"
|[[1952 Atlantic hurricane season|1952]]
|69.08
|11
|5
|2
|Below normal
|-
|[[1953 Atlantic hurricane season|1953]]
|98.5075
|14
|7
|3
|Near normal
|-
|[[1954 Atlantic hurricane season|1954]]
|110.88
|16
|7
|3
|Near normal
|- style="background:Gold;"
|[[1955 Atlantic hurricane season|1955]]
|158.17
|13
|9
|4
|Above normal
|- style="background:Cyan;"
|[[1956 Atlantic hurricane season|1956]]
|56.6725
|12
|4
|1
|Below normal
|-
|[[1957 Atlantic hurricane season|1957]]
|78.6625
|8
|3
|2
|Near normal
|-
|[[1958 Atlantic hurricane season|1958]]
|109.6925
|12
|7
|3
|Near normal
|-
|[[1959 Atlantic hurricane season|1959]]
|77.1075
|14
|7
|2
|Near normal
|- style="background:Cyan;"
|[[1960 Atlantic hurricane season|1960]]
|72.9
|8
|4
|2
|Below normal
|- style="background:Salmon;"
|[[1961 Atlantic hurricane season|1961]]
|188.9
|12
|8
|5
|Extremely active
|- style="background:Cyan;"
|[[1962 Atlantic hurricane season|1962]]
|35.5675
|7
|4
|0
|Below normal
|-
|[[1963 Atlantic hurricane season|1963]]
|117.9325
|10
|7
|3
|Near normal
|-
|- style="background:Gold;"
|[[1964 Atlantic hurricane season|1964]]
|153
|13
|7
|5
|Above normal
|-
|[[1965 Atlantic hurricane season|1965]]
|84.33
|10
|4
|1
|Near normal
|- style="background:Gold;"
|[[1966 Atlantic hurricane season|1966]]
|145.2175
|15
|7
|3
|Above normal
|-
|[[1967 Atlantic hurricane season|1967]]
|121.705
|13
|6
|1
|Near normal
|- style="background:Cyan;"
|[[1968 Atlantic hurricane season|1968]]
|45.0725
|9
|5
|0
|Below normal
|- style="background:Gold;"
|[[1969 Atlantic hurricane season|1969]]
|149
|18
|12
|3
|Above normal
|- style="background:Cyan;"
|[[1970 Atlantic hurricane season|1970]]
|40.18
|14
|7
|2
|Below normal
|-
|[[1971 Atlantic hurricane season|1971]]
|96.5275
|13
|6
|1
|Near normal
|- style="background:Cyan;"
|[[1972 Atlantic hurricane season|1972]]
|35.605
|7
|3
|0
|Below normal
|- style="background:Cyan;"
|[[1973 Atlantic hurricane season|1973]]
|47.85
|8
|4
|1
|Below normal
|- style="background:Cyan;"
|[[1974 Atlantic hurricane season|1974]]
|68.125
|11
|4
|2
|Below normal
|-
|[[1975 Atlantic hurricane season|1975]]
|76.0625
|9
|6
|3
|Near normal
|-
|[[1976 Atlantic hurricane season|1976]]
|84.1725
|10
|6
|2
|Near normal
|- style="background:Cyan;"
|[[1977 Atlantic hurricane season|1977]]
|25.3175
|6
|5
|1
|Below normal
|- style="background:Cyan;"
|[[1978 Atlantic hurricane season|1978]]
|63.2175
|12
|5
|2
|Below normal
|-
|[[1979 Atlantic hurricane season|1979]]
|92.9175
|9
|6
|2
|Near normal
|- style="background:Gold;"
|[[1980 Atlantic hurricane season|1980]]
|148.9375
|11
|9
|2
|Above normal
|-
|[[1981 Atlantic hurricane season|1981]]
|100.3275
|12
|7
|3
|Near normal
|- style="background:Cyan;"
|[[1982 Atlantic hurricane season|1982]]
|31.5025
|6
|2
|1
|Below normal
|- style="background:Cyan;"
|[[1983 Atlantic hurricane season|1983]]
|17.4025
|4
|3
|1
|Below normal
|-
|[[1984 Atlantic hurricane season|1984]]
|84.295
|13
|5
|1
|Near normal
|-
|[[1985 Atlantic hurricane season|1985]]
|87.9825
|11
|7
|3
|Near normal
|- style="background:Cyan;"
|[[1986 Atlantic hurricane season|1986]]
|35.7925
|6
|4
|0
|Below normal
|- style="background:Cyan;"
|[[1987 Atlantic hurricane season|1987]]
|34.36
|7
|3
|1
|Below normal
|-
|[[1988 Atlantic hurricane season|1988]]
|102.9925
|12
|5
|3
|Near normal
|- style="background:Gold;"
|[[1989 Atlantic hurricane season|1989]]
|135.125
|11
|7
|2
|Above normal
|-
|[[1990 Atlantic hurricane season|1990]]
|96.8025
|14
|8
|1
|Near normal
|- style="background:Cyan;"
|[[1991 Atlantic hurricane season|1991]]
|35.5375
|8
|4
|2
|Below normal
|-
|[[1992 Atlantic hurricane season|1992]]
|76.2225
|7
|4
|1
|Near normal
|- style="background:Cyan;"
|[[1993 Atlantic hurricane season|1993]]
|38.665
|8
|4
|1
|Below normal
|- style="background:Cyan;"
|[[1994 Atlantic hurricane season|1994]]
|32.02
|7
|3
|0
|Below normal
|- style="background:Salmon;"
|[[1995 Atlantic hurricane season|1995]]
|227.1025
|19
|11
|5
|Extremely active
|- style="background:Salmon;"
|[[1996 Atlantic hurricane season|1996]]
|166.1825
|13
|9
|6
|Extremely active 
|- style="background:Cyan;"
|[[1997 Atlantic hurricane season|1997]]
|40.9275
|8
|3
|1
|Below normal
|- style="background:Salmon;"
|[[1998 Atlantic hurricane season|1998]]
|181.7675
|14
|10
|3
|Extremely active
|- style="background:Salmon;"
|[[1999 Atlantic hurricane season|1999]]
|176.5275
|12
|8
|5
|Extremely active
|-
|[[2000 Atlantic hurricane season|2000]]
|119.1425
|15
|8
|3
|Near normal
|-
|[[2001 Atlantic hurricane season|2001]]
|110.32
|15
|9
|4
|Near normal
|- style="background:Cyan;"
|[[2002 Atlantic hurricane season|2002]]
|67.9925
|12
|4
|2
|Below normal
|- style="background:Salmon;"
|[[2003 Atlantic hurricane season|2003]]
|176.84
|16
|7
|3
|Extremely active
|- style="background:Salmon;"
|[[2004 Atlantic hurricane season|2004]]
|226.88
|15
|9
|6
|Extremely active
|- style="background:Salmon;"
|[[2005 Atlantic hurricane season|2005]]
|245.3
|28
|15
|7
|Extremely active
|-
|[[2006 Atlantic hurricane season|2006]]
|78.535
|10
|5
|2
|Near normal
|-
|[[2007 Atlantic hurricane season|2007]]
|73.885
|15
|6
|2
|Near normal
|- style="background:Gold;"
|[[2008 Atlantic hurricane season|2008]]
|145.7175
|16
|8
|5
|Above normal
|- style="background:Cyan;"
|[[2009 Atlantic hurricane season|2009]]
|52.58
|9
|3
|2
|Below normal
|- style="background:Salmon;"
|[[2010 Atlantic hurricane season|2010]]
|165.4825
|19
|12
|5
|Extremely active
|- style="background:Gold;"
|[[2011 Atlantic hurricane season|2011]]
|126.3025
|19
|7
|4
|Above normal
|- style="background:Gold;"
|[[2012 Atlantic hurricane season|2012]]
|132.6325
|19
|10
|2
|Above normal
|- style="background:Cyan;"
|[[2013 Atlantic hurricane season|2013]]
|36.12
|14
|2
|0
|Below normal
|-- style="background:Cyan;"
|[[2014 Atlantic hurricane season|2014]]
|66.725
|8
|6
|2
|Below normal
|- style="background:Cyan;"
|[[2015 Atlantic hurricane season|2015]]
|62.685
|11
|4
|2
|Below normal
|- style="background:Gold;"
|[[2016 Atlantic hurricane season|2016]]
|141.2525
|15
|7
|4
|Above normal
|- style="background:Salmon;"
|[[2017 Atlantic hurricane season|2017]]
|224.8775
|17
|10
|6
|Extremely active
|- style='background:Gold;"
|[[2018 Atlantic hurricane season|2018]]
|132.5825
|15
|8
|2
|Above normal
|- 
|- style='background:Gold;"
|[[2019 Atlantic hurricane season|2019]]
|132.2025
|18
|6
|3
|Above normal
|- 
|- style='background:Salmon;"
|[[2020 Atlantic hurricane season|2020]]
|180.3725
|30
|14
|7
|Extremely active
|- 
|- style='background:Gold;"
|[[2021 Atlantic hurricane season|2021]]
|145.5575
|21
|7
|4
|Above normal
|-
|- style=
|[[2022 Atlantic hurricane season|2022]]
|94.4225
|14
|8
|2
|Near normal
|- style='background:Gold;"
|[[2023 Atlantic hurricane season|2023]]
|145.5565
|20
|7
|3
|Above normal
|- style='background:Salmon;'
|[[2024 Atlantic hurricane season|2024]]
|161.63
|18
|11
|5
|Extremely active 
|}

==Eastern Pacific==
{{main|Pacific hurricane}}
{{Highest ACE Pacific hurricane seasons}}
Within the Eastern Pacific Ocean, the United States [[National Oceanic and Atmospheric Administration]] and others use the ACE index of a season to classify the season into one of three categories.<ref name="EPAC background">{{cite web|publisher=United States Climate Prediction Center|title=Background information: Eastern Pacific Hurricane Season|date=May 22, 2019|url=https://www.cpc.ncep.noaa.gov/products/Epac_hurr/Background.html|access-date=August 22, 2020|archive-url=https://web.archive.org/web/20200724071552/https://www.cpc.ncep.noaa.gov/products/outlooks/Background.html|archive-date=July 24, 2020|url-status=live}}</ref> These four categories are extremely active, above-, near-, and below-normal and are worked out using an approximate tercile partitioning of seasons based on the ACE index and the number of tropical storms, hurricanes, and major hurricanes over the 30 years between 1991 and 2020.<ref name="EPAC background"/>

For a season to be defined as above-normal, the ACE index criterion and two or more of the other criteria given in the table below must be satisfied.<ref name="EPAC background"/>

The mean value of the ACE index from 1991 to 2020 is 108.7 × 10<sup>4</sup> kt<sup>2</sup>, while the median value is 97.2 × 10<sup>4</sup> kt<sup>2</sup>.<ref name="EPAC background"/>

{| class="wikitable"
|+ Classification criteria
! scope="col" | Category
! scope="col" | ACE Index
! scope="col" | % of 1991–2020<br>median
! scope="col" | Tropical<br>storms
! scope="col" | Hurricanes
! scope="col" | Major<br>hurricanes
|-style="background:salmon
! Extremely active
|> 170 || > 180% || 22 or more || 10-16 or more || 9-11 or more
|-
|- style="background:gold;"
!Above-normal
|110-169 || 110%–175% || 15-19 or more || 8 or more || 6 or more
|-
!Near normal
|80–110 || 80–112% || 10-19 or fewer || 9 or fewer || 2-5 or fewer
|- style="background:Cyan;"
!Below-normal
|< 22-80 || < 75% ||colspan=3 {{N/A}}
|-
| colspan=6 style="text-align:center;" |'''Reference:'''<ref name="EPAC background"/>
|}

===Individual storms in the Pacific===
The highest ever ACE estimated for a single storm in the Eastern or Central Pacific, while located east of the [[International Date Line]] is 62.8, for [[Hurricane Fico]] of [[1978 Pacific hurricane season|1978]]. Other Eastern Pacific storms with high ACEs include [[Hurricane John (1994)|Hurricane John]] in [[1994 Pacific hurricane season|1994]], with an ACE of 54.0, [[1991 Pacific hurricane season#Hurricane Kevin|Hurricane Kevin]] in [[1991 Pacific hurricane season|1991]], with an ACE of 52.1, and [[Hurricane Hector (2018)|Hurricane Hector]] of [[2018 Pacific hurricane season|2018]], with an ACE of 50.5.<ref name="HURDAT2 - EPAC/CPAC">{{cite web |title=Eastern Pacific Best Track Data - (1949 - present) |url=https://www.nhc.noaa.gov/data/hurdat/hurdat2-nepac-1949-2017-050418.txt |publisher=National Hurricane Center |access-date=12 August 2018}}</ref>

The following table shows those storms in the Eastern and Central Pacific basins from 1971 through 2023 that have attained over 30 points of ACE.<ref name="Individual Storms - EPAC">{{cite web |last1=Webb |first1=Eric |title=Hurricane Hector 2018 - Discussion |url=https://twitter.com/webberweather/status/1027734105251885057 |website=Twitter |access-date=12 August 2018}}</ref>

{| class="wikitable sortable"
!Storm
!Year
![[Saffir–Simpson scale|Peak classification]]
!ACE
!Duration
|-
|[[Hurricane Fico]]
|[[1978 Pacific hurricane season|1978]]
|bgcolor=#{{storm colour|4}}|{{center|Category&nbsp;4 hurricane}}
|62.8
|20 days
|-
|[[Hurricane John (1994)|Hurricane John]] {{dagger}}
|[[1994 Pacific hurricane season|1994]]
|bgcolor=#{{storm colour|5}}|{{center|Category&nbsp;5 hurricane}}
|54.0<!-- Only includes ACE while east of 180W -->
|19 days<!-- Only includes time spent while east of 180W -->
|-
|[[1991 Pacific hurricane season#Hurricane Kevin|Hurricane Kevin]]
|[[1991 Pacific hurricane season|1991]]
|bgcolor=#{{storm colour|4}}|{{center|Category&nbsp;4 hurricane}}
|52.1
|17 days
|-
|[[Hurricane Hector (2018)|Hurricane Hector]] {{dagger}} 
|[[2018 Pacific hurricane season|2018]]
|bgcolor=#{{storm colour|4}}|{{center|Category&nbsp;4 hurricane}}
|50.5<!-- Only includes ACE while east of 180W -->
|13 days<!-- Only includes time spent while east of 180W -->
|-
|[[Hurricane Dora (2023)|Hurricane Dora]] {{dagger}}
|[[2023 Pacific hurricane season|2023]]
|bgcolor=#{{storm colour|4}}|{{center|Category&nbsp;4 hurricane}}
|48.4<!-- Only includes ACE while east of 180W -->
|12 days<!-- Only includes ACE while east of 180W -->
|-
|[[Hurricane Tina (1992)|Hurricane Tina]]
|[[1992 Pacific hurricane season|1992]]
|bgcolor=#{{storm colour|4}}|{{center|Category&nbsp;4 hurricane}}
|47.7
|22 days
|-
|[[1990 Pacific hurricane season#Hurricane Trudy|Hurricane Trudy]]
|[[1990 Pacific hurricane season|1990]]
|bgcolor=#{{storm colour|4}}|{{center|Category&nbsp;4 hurricane}}
|45.8
|16 days
|-
|[[Hurricane Lane (2018)|Hurricane Lane]]
|[[2018 Pacific hurricane season|2018]]
|bgcolor=#{{storm colour|5}}|{{center|Category&nbsp;5 hurricane}}
|44.2
|13 days
|-
|[[Hurricane Dora (1999)|Hurricane Dora]] {{dagger}}
|[[1999 Pacific hurricane season|1999]]
|bgcolor=#{{storm colour|4}}|{{center|Category&nbsp;4 hurricane}}
|41.4<!-- Only includes ACE while east of 180W -->
|13 days<!-- Only includes time spent while east of 180W -->
|-
|[[2015 Pacific hurricane season#Hurricane Jimena|Hurricane Jimena]]
|[[2015 Pacific hurricane season|2015]]
|bgcolor=#{{storm colour|4}}|{{center|Category&nbsp;4 hurricane}}
|40.0
|15 days
|-
|[[Hurricane Guillermo (1997)|Hurricane Guillermo]]
|[[1997 Pacific hurricane season|1997]]
|bgcolor=#{{storm colour|5}}|{{center|Category&nbsp;5 hurricane}}
|40.0
|16 days
|-
|[[Hurricane Norbert (1984)|Hurricane Norbert]]
|[[1984 Pacific hurricane season|1984]]
|bgcolor=#{{storm colour|4}}|{{center|Category&nbsp;4 hurricane}}
|39.6
|12 days
|-
|[[Hurricane Norman (2018)|Hurricane Norman]]
|[[2018 Pacific hurricane season|2018]]
|bgcolor=#{{storm colour|4}}|{{center|Category&nbsp;4 hurricane}}
|36.6
|12 days
|-
|[[Hurricane Celeste (1972)|Hurricane Celeste]]
|[[1972 Pacific hurricane season|1972]]
|bgcolor=#{{storm colour|4}}|{{center|Category&nbsp;4 hurricane}}
|36.3
|16 days
|-
|[[Hurricane Sergio (2018)|Hurricane Sergio]]
|[[2018 Pacific hurricane season|2018]]
|bgcolor=#{{storm colour|4}}|{{center|Category&nbsp;4 hurricane}}
|35.5
|13 days
|-
|[[2016 Pacific hurricane season#Hurricane Lester|Hurricane Lester]]
|[[2016 Pacific hurricane season|2016]]
|bgcolor=#{{storm colour|4}}|{{center|Category&nbsp;4 hurricane}}
|35.4
|14 days
|-
|[[2015 Pacific hurricane season#Hurricane Olaf|Hurricane Olaf]]
|[[2015 Pacific hurricane season|2015]]
|bgcolor=#{{storm colour|4}}|{{center|Category&nbsp;4 hurricane}}
|34.6
|12 days
|-
|[[1991 Pacific hurricane season#Hurricane Jimena|Hurricane Jimena]]
|[[1991 Pacific hurricane season|1991]]
|bgcolor=#{{storm colour|4}}|{{center|Category&nbsp;4 hurricane}}
|34.5
|12 days
|-
|[[1973 Pacific hurricane season#Hurricane Doreen|Hurricane Doreen]]
|[[1973 Pacific hurricane season|1973]]
|bgcolor=#{{storm colour|4}}|{{center|Category&nbsp;4 hurricane}}
|34.3
|16 days
|-
|[[Hurricane Ioke]] {{dagger}}
|[[2006 Pacific hurricane season|2006]]
|bgcolor=#{{storm colour|5}}|{{center|Category&nbsp;5 hurricane}}
|34.2<!-- Only includes ACE while east of 180W -->
|7 days<!-- Only includes time spent while east of 180W -->
|-
|[[1990 Pacific hurricane season#Hurricane Marie|Hurricane Marie]]
|[[1990 Pacific hurricane season|1990]]
|bgcolor=#{{storm colour|4}}|{{center|Category&nbsp;4 hurricane}}
|33.1
|14 days
|-
|[[1992 Pacific hurricane season#Hurricane Orlene|Hurricane Orlene]]
|[[1992 Pacific hurricane season|1992]]
|bgcolor=#{{storm colour|4}}|{{center|Category&nbsp;4 hurricane}}
|32.4
|12 days
|-
|[[1993 Pacific hurricane season#Hurricane Greg|Hurricane Greg]]
|[[1993 Pacific hurricane season|1993]]
|bgcolor=#{{storm colour|4}}|{{center|Category&nbsp;4 hurricane}}
|32.3
|13 days
|-
|[[Hurricane Hilary (2011)|Hurricane Hilary]]
|[[2011 Pacific hurricane season|2011]]
|bgcolor=#{{storm colour|4}}|{{center|Category&nbsp;4 hurricane}}
|31.2
|9 days
|-
|}
{{dagger}} &ndash; Indicates that the storm formed in the Eastern/Central Pacific, but crossed 180°W at least once; therefore, only the ACE and number of days spent in the Eastern/Central Pacific are included.

===Historical ACE in recorded Pacific hurricane history===
<div style="float:right;padding-top:1em">
{{ #invoke:Chart | bar chart
| delimiter = /
| group 1 =
  139
/ 136
/ 114
/ 90
/ 112
/ 121
/ 22
/ 207
/ 57
/ 77
/ 72
/ 161
/ 206
/ 193
/ 192
/ 107
/ 132
/ 127
/ 110
/ 245
/ 178
/ 295
/ 201
/ 185
/ 100
/ 53
/ 167
/ 134
/ 90
/ 95
/ 90
/ 124
/ 56
/ 71
/ 96
/ 155
/ 52
/ 83
/ 125
/ 49
/ 118
/ 98
/ 76
/ 198
/ 286
/ 183
/ 100
/ 318
/ 97
/ 73
/ 93
/ 116
/ 164
/ 82
| tooltip 1 =
  1971: 139
/ 1972: 136
/ 1973: 114
/ 1974: 90
/ 1975: 112
/ 1976: 121
/ 1977: 22
/ 1978: 207
/ 1979: 57
/ 1980: 77
/ 1981: 72
/ 1982: 161
/ 1983: 206
/ 1984: 193
/ 1985: 192
/ 1986: 107
/ 1987: 132
/ 1988: 127
/ 1989: 110
/ 1990: 245
/ 1991: 178
/ 1992: 295
/ 1993: 201
/ 1994: 185
/ 1995: 100
/ 1996: 53
/ 1997: 167
/ 1998: 134
/ 1999: 90
/ 2000: 95
/ 2001: 90
/ 2002: 124
/ 2003: 56
/ 2004: 71
/ 2005: 96
/ 2006: 155
/ 2007: 52
/ 2008: 83
/ 2009: 125
/ 2010: 49
/ 2011: 118
/ 2012: 98
/ 2013: 76
/ 2014: 198
/ 2015: 286
/ 2016: 183
/ 2017: 100
/ 2018: 318
/ 2019: 97
/ 2020: 73
/ 2021: 93
/ 2022: 116
/ 2023: 164
/ 2024: 82
| group names = Accumulated Cyclone Energy
| x legends = 1971 ///////// 1980 ////////// 1990 ////////// 2000 ////////// 2010 ///////// 2020 /////
}}
</div>
{{Multiple image|direction=vertical|align=right|image1=PDO.svg|image2=Hist east pac ace trend 1981-2015.gif|width=250|caption1=Observed monthly values for the [[Pacific Decadal Oscillation|PDO]] index, 1900–''present''.|caption2=Historical East Pacific Seasonal Activity, 1981–2015.}}

Data on ACE is considered reliable starting with the [[1971 Pacific hurricane season|1971 season]].

'''Classification criteria'''
{{legend|Salmon|Extremely active|border=solid 1px #AAAAAA}}
{{legend|Gold|Above-normal|border=solid 1px #AAAAAA}}
{{legend|White|Near-normal|border=solid 1px #AAAAAA}}
{{legend|Cyan|Below-normal|border=solid 1px #AAAAAA}}
{| class="wikitable sortable mw-collapsible"
|+ Accumulated Cyclone Energy - Pacific
! scope="col" | Season
! scope="col" | ACE
! scope="col" | [[Tropical cyclone#Tropical storm|TS]]
! scope="col" | [[Tropical cyclone scales#Atlantic, Eastern and Central Pacific|HU]]
! scope="col" | [[Tropical cyclone scales#Atlantic, Eastern and Central Pacific|MH]]
! scope="col" | Classification
|- style="background:gold;"
![[1971 Pacific hurricane season|1971]]
|139
|18
|12
|6
|Above normal
|- style="background:gold;"
![[1972 Pacific hurricane season|1972]]
|136
|14
|8
|4
|Above normal
|-
|- style="background:Gold;"
![[1973 Pacific hurricane season|1973]]
|114
|12
|7
|3
|Above normal
|-
![[1974 Pacific hurricane season|1974]]
|90
|18
|11
|3
|Near normal
|-
|- style="background:Gold;"
![[1975 Pacific hurricane season|1975]]
|112
|17
|9
|4
|Above normal
|- style="background:Gold;"
![[1976 Pacific hurricane season|1976]]
|121
|15
|9
|5
|Above normal
|- style="background:Cyan;"
![[1977 Pacific hurricane season|1977]]
|22
|8
|4
|0
|Below normal
|- style="background:Salmon;"
![[1978 Pacific hurricane season|1978]]
|207
|19
|14
|7
|Extremely active
|- style="background:Cyan;"
![[1979 Pacific hurricane season|1979]]
|57
|10
|6
|4
|Below normal
|- style="background:cyan;"
![[1980 Pacific hurricane season|1980]]
|77
|14
|7
|3
|Below normal
|- style="background:Cyan;"
![[1981 Pacific hurricane season|1981]]
|72
|15
|8
|1
|Below normal
|- style="background:Gold;"
![[1982 Pacific hurricane season|1982]]
|161
|23
|12
|5
|Above normal
|- style="background:Salmon;"
![[1983 Pacific hurricane season|1983]]
|206
|21
|12
|8
|Extremely active
|- style="background:Salmon;"
![[1984 Pacific hurricane season|1984]]
|193
|21
|13
|7
|Extremely active
|- style="background:Salmon;"
![[1985 Pacific hurricane season|1985]]
|192
|24
|13
|8
|Extremely active 
|-
|- style="background:white;"
![[1986 Pacific hurricane season|1986]]
|107
|17
|9
|3
|Near normal
|- style="background:Gold;"
![[1987 Pacific hurricane season|1987]]
|132
|20
|10
|4
|Above normal
|- style="background:Gold;"
![[1988 Pacific hurricane season|1988]]
|127
|15
|7
|3
|Above normal
|-
|- style="background:Gold;"
![[1989 Pacific hurricane season|1989]]
|110
|17
|9
|4
|Above normal
|- style="background:Salmon;"
![[1990 Pacific hurricane season|1990]]
|245
|21
|16
|6
|Extremely active
|- style="background:Salmon;"
![[1991 Pacific hurricane season|1991]]
|178
|14
|10
|5
|Extremely active
|- style="background:Salmon;"
![[1992 Pacific hurricane season|1992]]
|295
|27
|16
|10
|Extremely active
|- style="background:Salmon;"
![[1993 Pacific hurricane season|1993]]
|201
|15
|11
|9
|Extremely active
|- style="background:Salmon;"
![[1994 Pacific hurricane season|1994]]
|185
|20
|10
|5
|Extremely active
|-
![[1995 Pacific hurricane season|1995]]
|100
|10
|7
|3
|Near normal
|- style="background:cyan;"
![[1996 Pacific hurricane season|1996]]
|53
|9
|5
|2
|Below normal
|- style="background:gold;"
![[1997 Pacific hurricane season|1997]]
|167
|19
|9
|7
|Above normal
|- style="background:gold;"
![[1998 Pacific hurricane season|1998]]
|134
|13
|9
|6
|Above normal
|-
|- style="background:white;"
![[1999 Pacific hurricane season|1999]]
|90
|9
|6
|2
|Near normal
|-
![[2000 Pacific hurricane season|2000]]
|95
|19
|6
|2
|Near normal
|-
|- style="background:white;"
![[2001 Pacific hurricane season|2001]]
|90
|15
|8
|2
|Near normal
|-
|- style="background:gold;"
![[2002 Pacific hurricane season|2002]]
|125
|16
|8
|6
|Above normal
|- style="background:Cyan;"
![[2003 Pacific hurricane season|2003]]
|56
|16
|7
|0
|Below normal
|- style="background:Cyan;"
![[2004 Pacific hurricane season|2004]]
|71
|12
|6
|3
|Below normal
|-
![[2005 Pacific hurricane season|2005]]
|96
|15
|7
|2
|Near normal
|- style="background:gold;"
![[2006 Pacific hurricane season|2006]]
|155
|19
|11
|6
|Above normal
|- style="background:Cyan;"
![[2007 Pacific hurricane season|2007]]
|52
|11
|4
|1
|Below normal
|-
|- style="background:white;"
![[2008 Pacific hurricane season|2008]]
|83
|17
|7
|2
|Near normal
|- style="background:Gold;"
![[2009 Pacific hurricane season|2009]]
|127
|20
|8
|5
|Above normal
|- style="background:Cyan;"
![[2010 Pacific hurricane season|2010]]
|52
|8
|3
|2
|Below normal
|- style="background:Gold;"
![[2011 Pacific hurricane season|2011]]
|121
|11
|10
|6
|Above normal
|-
![[2012 Pacific hurricane season|2012]]
|98
|17
|10
|5
|Near normal
|- style="background:cyan;"
![[2013 Pacific hurricane season|2013]]
|76
|20
|9
|1
|Below normal
|- style="background:Salmon;"
![[2014 Pacific hurricane season|2014]]
|201
|22
|16
|9
|Extremely active
|- style="background:Salmon;"
![[2015 Pacific hurricane season|2015]]
|290
|26
|16
|11
|Extremely active
|- style="background:Salmon;”
![[2016 Pacific hurricane season|2016]]
|184
|22
|13
|6
|Extremely active
|-
![[2017 Pacific hurricane season|2017]]
|100
|18
|9
|4
|Near normal
|- style="background:Salmon;"
![[2018 Pacific hurricane season|2018]]
|318
|23
|13
|10
|Extremely active
|- 
![[2019 Pacific hurricane season|2019]]
|97
|19
|7
|4
|Near normal
|- style="background:Cyan;"
![[2020 Pacific hurricane season|2020]]
|73
|17
|4
|3
|Below normal
|- 
![[2021 Pacific hurricane season|2021]]
|93
|19
|8
|2
|Near normal
|- style="background:Gold;”
![[2022 Pacific hurricane season|2022]]
|116
|19
|10
|4
|Above normal
|- style="background:gold;”
![[2023 Pacific hurricane season|2023]]
|164
|17
|10
|8
|Above normal
|- style="background:white;"
![[2024 Pacific hurricane season|2024]]
|82
|14
|5
|3
|Near normal
|}

== Western Pacific ==
{{Expand section|date=July 2023}}
{{main|Pacific typhoon season}}
{| class="wikitable" style="float:right"
!TSR forecasts
Date
!Tropical
storms
!Total
Typhoons
!Intense
TCs
!{{Abbr|ACE|Accumulated Cyclone Energy}}
!{{Abbr|Ref.|Reference}}
|-
|<small>Average (1991–2020)</small>
|25.5
|16.0
|9.3
|301
|<ref name="TSR May2">{{cite report |url=http://www.tropicalstormrisk.com/docs/TSRNWPForecastMay2024.pdf |title=Extended Range Forecast for Northwest Pacific Typhoon Activity in 2024 |last1=Lea |first1=Adam |last2=Wood |first2=Nick |date=May 7, 2023 |publisher=Tropical Storm Risk Consortium |access-date=May 7, 2023 |archive-url=https://web.archive.org/web/20230506091817/http://www.tropicalstormrisk.com/docs/TSRNWPForecastMay2024.pdf |archive-date=May 6, 2023 |url-status=live}}</ref>
|}
{| class="wikitable"
! Category !! 1990 –2020 ACE Index [kt<sup>2</sup>] 
|-
| Extremely active || > 328 
|-
| Near-normal || 259 - 328 
|-
| Below-normal || < 259 
|-
| colspan="5" style="text-align:center;" |'''Reference:'''<ref name="background" />
|}{{Top 10 Most Intense Pacific typhoon season}}

===Historical ACE in recorded Western Pacific typhoon history===
There is an undercount bias of tropical storms, typhoons, and super typhoon before the satellite era (prior to the mid–1950s), due to the difficulty in identifying storms.

'''Classification criteria'''{{clarification|date=November 2024}}
{{legend|Salmon|Extremely active|border=solid 1px #AAAAAA}}
{{legend|Gold|Above-normal|border=solid 1px #AAAAAA}}
{{legend|White|Near-normal|border=solid 1px #AAAAAA}}
{{legend|Cyan|Below-normal|border=solid 1px #AAAAAA}}

{| class="wikitable sortable mw-collapsible"
|+ Accumulated cyclone energy - Pacific typhoon
! scope="col" | Season
! scope="col" | ACE
! scope="col" | [[Tropical cyclone#Tropical storm|TS]]
! scope="col" | [[Tropical cyclone scales#Western Pacific|TY]]
! scope="col" | [[Tropical cyclone scales#Western Pacific|STY]]
! scope="col" | Classification
|- style="background:Cyan;"
|[[1950 Pacific typhoon season|1950]]
|160.2
|18
|12
|1
|Below normal
|-
|[[1951 Pacific typhoon season|1951]]
|283.4
|25
|16
|1
|Near normal
|-
|- style="background:Salmon;"
|[[1952 Pacific typhoon season|1952]]
|338
|29
|20
|6
|Extremely active
|-
|- style="background:Salmon;"
|[[1953 Pacific typhoon season|1953]]
|362.6
|24
|17
|5
|Extremely active
|-
|[[1954 Pacific typhoon season|1954]]
|305.5
|19
|15
|5
|Near normal
|-
|- style="background:Cyan;"
|[[1955 Pacific typhoon season|1955]]
|249.8
|31
|20
|4
|Below normal
|-
|[[1956 Pacific typhoon season|1956]]
|305.6
|26
|18
|5
|Near normal
|-
|- style="background:Salmon;"
|[[1957 Pacific typhoon season|1957]]
|440.2
|22
|18
|8
|Extremely active
|-
|- style="background:Salmon;"
|[[1958 Pacific typhoon season|1958]]
|445.8
|23
|21
|9
|Extremely active
|-
|- style="background:Salmon;"
|[[1959 Pacific typhoon season|1959]]
|397.6
|25
|18
|8
|Extremely active
|-
|[[1960 Pacific typhoon season|1960]]
|326.7
|30
|19
|2
|Near normal
|-
|- style="background:Salmon;"
|[[1961 Pacific typhoon season|1961]]
|365.6
|27
|20
|8
|Extremely active
|-
|- style="background:Salmon;"
|[[1962 Pacific typhoon season|1962]]
|423
|30
|23
|6
|Extremely active
|-
|- style="background:Salmon;"
|[[1963 Pacific typhoon season|1963]]
|386
|25
|19
|8
|Extremely active
|-
|- style="background:Salmon;"
|[[1964 Pacific typhoon season|1964]]
|403.1
|38
|26
|7
|Extremely active
|-
|- style="background:Salmon;"
|[[1965 Pacific typhoon season|1965]]
|436.3
|34
|21
|11
|Extremely active
|-
|[[1966 Pacific typhoon season|1966]]
|302.2
|30
|20
|3
|Near normal
|-
|- style="background:Salmon;"
|[[1967 Pacific typhoon season|1967]]
|398.1
|34
|19
|5
|Extremely active
|-
|- style="background:Salmon;"
|[[1968 Pacific typhoon season|1968]]
|356.8
|27
|20
|4
|Extremely active
|-
|- style="background:Cyan;"
|[[1969 Pacific typhoon season|1969]]
|203.7
|19
|13
|2
|Below normal
|-
|[[1970 Pacific typhoon season|1970]]
|287.5
|24
|12
|7
|Near normal
|-
|- style="background:salmon;"
|[[1971 Pacific typhoon season|1971]]
|380.2
|35
|25
|6
|Extremely active
|-
|- style="background:salmon;"
|[[1972 Pacific typhoon season|1972]]
|413
|29
|22
|2
|Extremely active
|-
|- style="background:Cyan"
|[[1973 Pacific typhoon season|1973]]
|148.1
|21
|12
|3
|Below normal
|-
|- style="background:Cyan;"
|[[1974 Pacific typhoon season|1974]]
|205.3
|32
|16
|0
|Below normal
|-
|- style="background:Cyan"
|[[1975 Pacific typhoon season|1975]]
|171
|20
|14
|3
|Below normal
|-
|[[1976 Pacific typhoon season|1976]]
|301.3
|25
|14
|4
|Near normal
|-
|- style="background:Cyan"
|[[1977 Pacific typhoon season|1977]]
|164.1
|19
|11
|3
|Below normal
|-
|- style="background:Cyan;"
|[[1978 Pacific typhoon season|1978]]
|236.8
|28
|15
|1
|Below normal
|-
|[[1979 Pacific typhoon season|1979]]
|278.4
|23
|14
|4
|Near normal
|-
|- style="background:Cyan;"
|[[1980 Pacific typhoon season|1980]]
|237.8
|23
|15
|2
|Below normal
|-
|- style="background:Cyan;"
|[[1981 Pacific typhoon season|1981]]
|227
|28
|16
|2
|Below normal
|-
|- style="background:Salmon"
|[[1982 Pacific typhoon season|1982]]
|356.1
|25
|19
|2
|Extremely active
|-
|- style="background:Cyan;"
|[[1983 Pacific typhoon season|1983]]
|219.7
|23
|12
|4
|Below normal
|-
|[[1984 Pacific typhoon season|1984]]
|274
|27
|16
|2
|Near normal
|-
|- style="background:Cyan;"
|[[1985 Pacific typhoon season|1985]]
|231.2
|25
|17
|1
|Below normal
|-
|- style="background:Salmon"
|[[1986 Pacific typhoon season|1986]]
|334.2
|26
|19
|3
|Extremely active
|-
|- style="background:Salmon"
|[[1987 Pacific typhoon season|1987]]
|356.5
|23
|17
|6
|Extremely active
|-
|- style="background:Cyan;"
|[[1988 Pacific typhoon season|1988]]
|227.9
|25
|13
|1
|Below normal
|-
|[[1989 Pacific typhoon season|1989]]
|305
|30
|21
|5
|Near normal
|-
|- style="background:Salmon"
|[[1990 Pacific typhoon season|1990]]
|377.8
|30
|21
|4
|Extremely active
|-
|- style="background:Salmon"
|[[1991 Pacific typhoon season|1991]]
|414.3
|29
|20
|5
|Extremely active
|-
|- style="background:Salmon"
|[[1992 Pacific typhoon season|1992]]
|470.1
|31
|21
|4
|Extremely active
|-
|- style="background:White"
|[[1993 Pacific typhoon season|1993]]
|267.1
|29
|20
|3
|Near normal
|-
|- style="background:Salmon"
|[[1994 Pacific typhoon season|1994]]
|454.6
|34
|20
|6
|Extremely active
|-
|- style="background:Cyan"
|[[1995 Pacific typhoon season|1995]]
|255.1
|26
|15
|5
|Below normal
|-
|- style="background:Salmon"
|[[1996 Pacific typhoon season|1996]]
|416.5
|33
|21
|6
|Extremely active
|-
|- style="background:Salmon"
|[[1997 Pacific typhoon season|1997]]
|570.4
|29
|23
|11
|Extremely active
|-
|- style="background:Cyan"
|[[1998 Pacific typhoon season|1998]]
|152.9
|18
|9
|3
|Below normal
|-
|- style="background:Cyan"
|[[1999 Pacific typhoon season|1999]]
|109.9
|23
|11
|1
|Below normal
|-
|- style="background:Cyan;"
|[[2000 Pacific typhoon season|2000]]
|252.9
|25
|14
|4
|Below normal
|-
|[[2001 Pacific typhoon season|2001]]
|307.3
|29
|21
|3
|Near normal
|-
|- style="background:Salmon"
|[[2002 Pacific typhoon season|2002]]
|390.6
|24
|16
|8
|Extremely active
|-
|- style="background:Salmon"
|[[2003 Pacific typhoon season|2003]]
|337.4
|22
|17
|5
|Extremely active
|-
|- style="background:Salmon"
|[[2004 Pacific typhoon season|2004]]
|480.6
|31
|20
|6
|Extremely active
|-
|[[2005 Pacific typhoon season|2005]]
|309.9
|24
|18
|3
|Near normal
|-
|[[2006 Pacific typhoon season|2006]]
|321.3
|21
|13
|6
|Near normal
|-
|- style="background:Cyan;"
|[[2007 Pacific typhoon season|2007]]
|219.5
|22
|16
|5
|Below normal
|-
|- style="background:Cyan"
|[[2008 Pacific typhoon season|2008]]
|178.4
|27
|12
|2
|Below normal
|-
|[[2009 Pacific typhoon season|2009]]
|278.1
|23
|15
|5
|Near normal
|-
|- style="background:Cyan"
|[[2010 Pacific typhoon season|2010]]
|121.4
|14
|9
|1
|Below normal
|-
|- style="background:Cyan;"
|[[2011 Pacific typhoon season|2011]]
|189.7
|18
|10
|4
|Below normal
|-
|[[2012 Pacific typhoon season|2012]]
|302.3
|25
|15
|4
|Near normal
|-
|[[2013 Pacific typhoon season|2013]]
|276.3
|27
|16
|5
|Near normal
|-
|[[2014 Pacific typhoon season|2014]]
|277.8
|20
|12
|8
|Near normal
|-
|- style="background:Salmon"
|[[2015 Pacific typhoon season|2015]]
|462.9
|26
|20
|9
|Extremely active
|-
|- style="background:White"
|[[2016 Pacific typhoon season|2016]]
|261.9
|26
|17
|6
|Near normal
|-
|- style="background:Cyan"
|[[2017 Pacific typhoon season|2017]]
|169.4
|26
|13
|2
|Below normal
|-
|- style="background:Salmon"
|[[2018 Pacific typhoon season|2018]]
|361.6
|31
|16
|7
|Extremely active
|-
|[[2019 Pacific typhoon season|2019]]
|276.8
|30
|18
|5
|Near normal
|-
|- style="background:Cyan"
|[[2020 Pacific typhoon season|2020]]
|152.8
|23
|12
|2
|Below normal
|-
|- style="background:Cyan;"
|[[2021 Pacific typhoon season|2021]]
|209.6
|23
|10
|5
|Below normal
|-
|- style="background:Cyan"
|[[2022 Pacific typhoon season|2022]]
|163.2
|22
|12
|3
|Below normal
|-
|- style="background:White"
|[[2023 Pacific typhoon season|2023]]
|268.5
|16
|11
|4
|Near normal
|-
|- style="background:Cyan;"
|[[2024 Pacific typhoon season|2024]]
|210.1
|26
|13
|6
|Below normal
|-
|-
|[[2025 Pacific typhoon season|2025]]
|
|
|
|
|
|}

==North Indian==
{{main|North Indian Ocean tropical cyclone}}
There are various agencies over the North Indian Ocean that monitor and forecast tropical cyclones, including the United States Joint Typhoon Warning Center, as well as the Bangladesh, Pakistan and India Meteorological Department.<ref name="Variation">{{cite journal|author=Mohapatra M|author2=Vijay Kumar, V|title=Interannual variation of tropical cyclone energy metrics over North Indian Ocean|journal=Climate Dynamics |date=March 2017 |volume=48 |issue=5–6 |pages=1431–1445 |doi=10.1007/s00382-016-3150-3|bibcode=2017ClDy...48.1431M |s2cid=130486452}}</ref> As a result, the track and intensity of tropical cyclones differ from each other, and as a result, the accumulated cyclone energy also varies over the region.<ref name="Variation" /> However, the India Meteorological Department has been designated as the official Regional Specialised Meteorological Centre by the WMO for the region and has worked out the ACE for all cyclonic systems above {{convert|17|kn|km/h mph}} based on their best track analysis which goes back to 1982.<ref name="Variation" /><ref name="Energy Matrix">{{cite report|title=Tropical Cyclone Energy Matrix over North Indian Ocean |url=http://www.rsmcnewdelhi.imd.gov.in/images/bulletin/tcenergymatrix.pdf |publisher=India Meteorological Department |access-date=September 3, 2020 |archive-url=https://web.archive.org/web/20200718221357/http://www.rsmcnewdelhi.imd.gov.in/images/bulletin/tcenergymatrix.pdf |archive-date=July 18, 2020|date=2020|url-status=live}}</ref>

{| class="wikitable sortable"
|+ Top 5 North Indian Ocean cyclone seasons
! scope="col" | Season
! scope="col" | D
! scope="col" | DD
! scope="col" | [[List of cyclonic storms|CS]]
! scope="col" | [[List of severe cyclonic storms|SCS]]
! scope="col" | [[List of very severe cyclonic storms|VSCS]]
! scope="col" | [[List of extremely severe cyclonic storms|ESCS]]
! scope="col" | [[List of super cyclonic storms|SUCS]]
! scope="col" | ACE
|-
| [[2019 North Indian Ocean cyclone season|2019]] || 12 || 11 || 8 || 6 || 6 || 3 || 1 || 93
|-
| [[2023 North Indian Ocean cyclone season|2023]] || 9 || 7 || 6 || 5 || 4 || 3 || 0 || 55
|-
| [[2007 North Indian Ocean cyclone season|2007]] || 11 || 8 || 4 || 2 || 2 || 2 || 1 || 46.1
|-
| [[2013 North Indian Ocean cyclone season|2013]] || 10 || 6 || 5 || 4 || 3 || 1 || 0 || 45.6
|-
| [[1999 North Indian Ocean cyclone season|1999]] || 10 || 8 || 5 || 3 || 3 || 2 || 1 || 44.3
|-
! colspan=9| References:<ref name="Variation" /><ref name="Energy Matrix" />
|}

===Historical ACE in recorded North Indian cyclonic history===
{{Expand section|date=October 2023}}

== See also ==
{{Portal|Tropical cyclones}}
* [[Atlantic hurricane]]
* [[Cyclone Freddy]] – Produced the highest accumulated cyclone energy amount worldwide
* [[Hurricane Ioke|Hurricane/Typhoon Ioke]] - The second-most ACE producing tropical cyclone on record, most in the Northern Hemisphere
* [[Saffir–Simpson scale]] – Alternative intensity scale

==References==
{{Reflist|30em}}

==External links==
* [https://www.ncdc.noaa.gov/ibtracs/ The International Best Track Archive for Climate Stewardship (IBTrACS)]
* [http://tropical.atmos.colostate.edu/Realtime/ Colorado State University's Real Time Tropical Cyclone Statistics]
* [http://climatlas.com/tropical/ Ryan Maue's Global Tropical Cyclone Activity]

{{DEFAULTSORT:Accumulated Cyclone Energy}}
[[Category:Meteorological quantities]]
[[Category:Tropical cyclone meteorology]]