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.
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. 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. 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 km/h; 39 mph); the resulting figure is divided by 10,000 to place it on a more manageable scale. The HDP index was later modified to further include tropical storms, that is, all wind speeds of at least 34 knots (≥ 63 km/h; 39 mph),
The highest ACE calculated for a single tropical cyclone on record worldwide is 85.26, set by Hurricane Ioke in 2006.
History
The ACE index is an offshoot of Hurricane Destruction Potential (HDP), an index created in 1988 by William Gray and his associates at Colorado State University 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.
Calculation
Accumulated cyclone energy is calculated by summing the squares of the estimated maximum sustained velocity of tropical and subtropical cyclones when wind speeds are at least tropical storm strength (≥ 34 kn; 63 km/h; 39 mph)]]
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 three categories. These three categories are above-normal, near-normal, and below-normal, and are worked out using an approximate tercile partitioning of seasons based on the ACE index over the 70 years between 1951 and 2020. Embedded within the above-normal category is a fourth category, extremely active, which captures seasons of extreme activity. The median value of the ACE index from 1951 to 2020 is 96.7 × 10<sup>4</sup> kt<sup>2</sup>.
{| 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 || > 130%
|-
| Near-normal || 73.0–126.1 || 75%–130%
|-
| Below-normal || < 73.0 || < 75%
|-
| colspan=6 style="text-align:center;" |Reference:
|}
{| class="wikitable sortable"
|+ Top 10 Atlantic hurricane seasons
! scope="col" | Season
! scope="col" | TS
! scope="col" | HU
! scope="col" | MH
! scope="col" | ACE
|-
| 1933 || 20 || 11 || 6 || 258.57
|-
| 2005 || 28 || 15 || 7 || 245.3
|-
| 1893 || 12 || 10 || 5 || 231.15
|-
| 1926 || 11 || 8 || 6 || 229.56
|-
| 1995 || 19 || 11 || 5 || 227.10
|-
| 2004 || 15 || 9 || 6 || 226.88
|-
| 2017 || 17 || 10 || 6 || 224.88
|-
| 1950 || 16 || 11 || 6 || 211.28
|-
| 1961 || 12 || 8 || 5 || 188.9
|-
| 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 San Ciriaco hurricane in 1899 – a Category 4 hurricane which lasted for four weeks, had an ACE higher than many whole Atlantic storm seasons. Other Atlantic storms with high ACEs include Hurricane Ivan in 2004, with an ACE of 70.4; Hurricane Irma in 2017, with an ACE of 64.9;<!--Please refer to Talk:2017 Atlantic hurricane season/ACE calcs--> the Great Charleston Hurricane in 1893, with an ACE of 63.5; Hurricane Isabel in 2003, with an ACE of 63.3; and the 1932 Cuba hurricane, with an ACE of 59.8.
Since 1950, the highest ACE of a tropical storm was Tropical Storm Philippe in 2023, which attained an ACE of 9.4. The highest ACE of a Category 1 hurricane was Hurricane Nadine in 2012, which attained an ACE of 26.3. The record for lowest ACE of a tropical storm is jointly held by Tropical Storm Chris in 2000 and Tropical Storm Philippe in 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's Hurricane Cindy, which was only a hurricane for six hours, and 2007's 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 3 or higher) was Hurricane Gerda in 1969, with an ACE of 5.3.
The following table shows those storms in the Atlantic basin from 1851–2021 that have attained over 50 points of ACE.
! scope="col" | Season
! scope="col" | ACE
! scope="col" | TS
! scope="col" | HU
! scope="col" | MH
! scope="col" | Classification
|- style="background:Cyan;"
|1851
|36.24
|6
|3
|1
|Below normal
|-
|1852
|73.28
|5
|5
|1
|Near normal
|-
|1853
|76.49
|8
|4
|2
|Near normal
|- style="background:Cyan;"
|1854
|31.00
|5
|3
|1
|Below normal
|- style="background:Cyan;"
|1855
|18.12
|5
|4
|1
|Below normal
|- style="background:Cyan;"
|1856
|48.94
|6
|4
|2
|Below normal
|- style="background:Cyan;"
|1857
|46.84
|4
|3
|0
|Below normal
|- style="background:Cyan;"
|1858
|44.79
|6
|6
|0
|Below normal
|- style="background:Cyan;"
|1859
|55.73
|8
|7
|1
|Below normal
|- style="background:Cyan;"
|1860
|62.06
|7
|6
|1
|Below normal
|- style="background:Cyan;"
|1861
|49.71
|8
|6
|0
|Below normal
|- style="background:Cyan;"
|1862
|46.03
|6
|3
|0
|Below normal
|- style="background:Cyan;"
|1863
|50.35
|9
|5
|0
|Below normal
|- style="background:Cyan;"
|1864
|26.55
|5
|3
|0
|Below normal
|- style="background:Cyan;"
|1865
|49.13
|7
|3
|0
|Below normal
|-
|1866
|83.65
|7
|6
|1
|Near normal
|- style="background:Cyan;"
|1867
|59.97
|9
|7
|1
|Below normal
|- style="background:Cyan;"
|1868
|34.65
|4
|3
|0
|Below normal
|- style="background:Cyan;"
|1869
|51.02
|10
|7
|1
|Below normal
|-
|1870
|87.8
|11
|10
|2
|Near normal
|-
|1871
|88.39
|8
|6
|2
|Near normal
|- style="background:Cyan;"
|1872
|65.38
|5
|4
|0
|Below normal
|- style="background:Cyan;"
|1873
|69.47
|5
|3
|2
|Below normal
|- style="background:Cyan;"
|1874
|47.05
|7
|4
|0
|Below normal
|- style="background:Cyan;"
|1875
|72.48
|6
|5
|1
|Below normal
|- style="background:Cyan;"
|1876
|56.05
|5
|4
|2
|Below normal
|-
|1877
|73.36
|8
|3
|1
|Near normal
|- style="background:Salmon;"
|1878
|180.85
|12
|10
|2
|Extremely active
|- style="background:Cyan;"
|1879
|63.63
|8
|6
|2
|Below normal
|- style="background:Gold;"
|1880
|131.08
|11
|9
|2
|Above normal
|- style="background:Cyan;"
|1881
|59.25
|7
|4
|0
|Below normal
|- style="background:Cyan;"
|1882
|59.4675
|6
|4
|2
|Below normal
|-style="background:Cyan;"
|1883
|66.7
|4
|3
|2
|Below normal
|-style="background:Cyan;"
|1884
|72.06
|4
|4
|1
|Below normal
|- style="background:Cyan;"
|1885
|58.3
|8
|6
|0
|Below normal
|- style="background:Salmon;"
|1886
|166.165
|12
|10
|4
|Extremely active
|- style="background:Salmon;"
|1887
|181.26
|19
|11
|2
|Extremely active
|-
|1888
|84.945
|9
|6
|2
|Near normal
|-
|1889
|104.0425
|9
|6
|0
|Near normal
|- style="background:Cyan;"
|1890
|33.345
|4
|2
|1
|Below normal
|-
|1891
|116.105
|10
|7
|1
|Near normal
|-
|1892
|115.8375
|9
|5
|0
|Near normal
|- style="background:Salmon;"
|1893
|231.1475
|12
|10
|5
|Extremely active
|- style="background:Gold;"
|1894
|135.42
|7
|5
|4
|Above normal
|- style="background:Cyan;"
|1895
|68.765
|6
|2
|0
|Below normal
|- style="background:Gold;"
|1896
|136.0825
|7
|6
|2
|Above normal
|- style="background:Cyan;"
|1897
|54.54
|6
|3
|0
|Below normal
|-
|1898
|113.2375
|11
|5
|1
|Near normal
|- style="background:gold;"
|1899
|151.025
|10
|5
|2
|Above normal
|-
|1900
|83.345
|7
|3
|2
|Near normal
|-
|1901
|98.975
|13
|6
|0
|Near normal
|- style="background:Cyan;"
|1902
|32.65
|5
|3
|0
|Below normal
|-
|1903
|102.07
|10
|7
|1
|Near normal
|- style="background:Cyan;"
|1904
|30.345
|6
|4
|0
|Below normal
|- style="background:Cyan;"
|1905
|28.3775
|5
|1
|1
|Below normal
|- style="background:Salmon;"
|1906
|162.88
|11
|6
|3
|Extremely active
|- style="background:Cyan;"
|1907
|13.06
|5
|0
|0
|Below normal
|-
|1908
|95.11
|10
|6
|1
|Near normal
|-
|1909
|93.34
|12
|6
|4
|Near normal
|- style="background:Cyan;"
|1910
|63.9
|5
|3
|1
|Below normal
|- style="background:Cyan;"
|1911
|34.2875
|6
|3
|0
|Below normal
|- style="background:Cyan;"
|1912
|57.2625
|7
|4
|1
|Below normal
|- style="background:Cyan;"
|1913
|35.595
|6
|4
|0
|Below normal
|- style="background:Cyan;"
|1914
|2.53
|1
|0
|0
|Below normal
|- style="background:Gold;"
|1915
|130.095
|6
|5
|3
|Above normal
|- style="background:Gold;"
|1916
|144.0125
|15
|10
|5
|Above normal
|- style="background:Cyan;"
|1917
|60.6675
|4
|2
|2
|Below normal
|- style="background:Cyan;"
|1918
|39.8725
|6
|4
|1
|Below normal
|- style="background:Cyan;"
|1919
|55.04
|5
|2
|1
|Below normal
|- style="background:Cyan;"
|1920
|29.81
|5
|4
|0
|Below normal
|-
|1921
|86.53
|7
|5
|2
|Near normal
|- style="background:Cyan;"
|1922
|54.515
|5
|3
|1
|Below normal
|- style="background:Cyan;"
|1923
|49.31
|9
|4
|1
|Below normal
|-
|1924
|100.1875
|11
|5
|2
|Near normal
|- style="background:Cyan;"
|1925
|7.2525
|4
|1
|0
|Below normal
|- style="background:Salmon;"
|1926
|229.5575
|11
|8
|6
|Extremely active
|- style="background:Cyan;"
|1927
|56.4775
|8
|4
|1
|Below normal
|-
|1928
|83.475
|6
|4
|1
|Near normal
|- style="background:Cyan;"
|1929
|48.0675
|5
|3
|1
|Below normal
|- style="background:Cyan;"
|1930
|49.7725
|3
|2
|2
|Below normal
|- style="background:Cyan;"
|1931
|47.835
|13
|3
|1
|Below normal
|- style="background:Salmon;"
|1932
|169.6625
|15
|6
|4
|Extremely active
|- style="background:Salmon;"
|1933
|258.57
|20
|11
|6
|Extremely active
|-
|1934
|79.0675
|13
|7
|1
|Near normal
|-
|1935
|106.2125
|8
|5
|3
|Near normal
|-
|1936
|99.775
|17
|7
|1
|Near normal
|- style="background:Cyan;"
|1937
|65.85
|11
|4
|1
|Below normal
|-
|1938
|77.575
|9
|4
|2
|Near normal
|- style="background:Cyan;"
|1939
|43.6825
|6
|3
|1
|Below normal
|-style="background:Cyan;"
|1940
|67.79
|9
|6
|0
|Below normal
|- style="background:Cyan;"
|1941
|51.765
|6
|4
|3
|Below normal
|- style="background:Cyan;"
|1942
|62.485
|11
|4
|1
|Below normal
|-
|1943
|94.01
|10
|5
|2
|Near normal
|-
|1944
|104.4525
|14
|8
|3
|Near normal
|- style="background:Cyan;"
|1945
|63.415
|11
|5
|2
|Below normal
|- style="background:Cyan;"
|1946
|19.6125
|7
|3
|0
|Below normal
|-
|1947
|88.49
|10
|5
|2
|Near normal
|-
|1948
|94.9775
|10
|6
|4
|Near normal
|-
|1949
|96.4475
|16
|7
|2
|Near normal
|- style="background:Salmon;"
|1950
|211.2825
|16
|11
|6
|Extremely active
|- style="background:Gold;"
|1951
|126.325
|12
|8
|3
|Above normal
|- style="background:Cyan;"
|1952
|69.08
|11
|5
|2
|Below normal
|-
|1953
|98.5075
|14
|7
|3
|Near normal
|-
|1954
|110.88
|16
|7
|3
|Near normal
|- style="background:Gold;"
|1955
|158.17
|13
|9
|4
|Above normal
|- style="background:Cyan;"
|1956
|56.6725
|12
|4
|1
|Below normal
|-
|1957
|78.6625
|8
|3
|2
|Near normal
|-
|1958
|109.6925
|12
|7
|3
|Near normal
|-
|1959
|77.1075
|14
|7
|2
|Near normal
|- style="background:Cyan;"
|1960
|72.9
|8
|4
|2
|Below normal
|- style="background:Salmon;"
|1961
|188.8975
|12
|8
|5
|Extremely active
|- style="background:Cyan;"
|1962
|50.45
|7
|4
|0
|Below normal
|-
|1963
|112.09
|10
|7
|3
|Near normal
|- style="background:Gold;"
|1964
|153.0425
|13
|7
|5
|Above normal
|-
|1965
|86.7175
|10
|4
|1
|Near normal
|- style="background:Gold;"
|1966
|145.2175
|15
|7
|3
|Above normal
|-
|1967
|121.705
|13
|6
|1
|Near normal
|- style="background:Cyan;"
|1968
|45.0725
|9
|5
|0
|Below normal
|- style="background:Gold;"
|1969
|149
|18
|12
|3
|Above normal
|- style="background:Cyan;"
|1970
|40.18
|14
|7
|2
|Below normal
|-
|1971
|96.5275
|13
|6
|1
|Near normal
|- style="background:Cyan;"
|1972
|35.605
|7
|3
|0
|Below normal
|- style="background:Cyan;"
|1973
|47.85
|8
|4
|1
|Below normal
|- style="background:Cyan;"
|1974
|68.125
|11
|4
|2
|Below normal
|-
|1975
|76.0625
|9
|6
|3
|Near normal
|-
|1976
|84.1725
|10
|6
|2
|Near normal
|- style="background:Cyan;"
|1977
|25.3175
|6
|5
|1
|Below normal
|- style="background:Cyan;"
|1978
|63.2175
|12
|5
|2
|Below normal
|-
|1979
|92.9175
|9
|6
|2
|Near normal
|- style="background:Gold;"
|1980
|148.9375
|11
|9
|2
|Above normal
|-
|1981
|100.3275
|12
|7
|3
|Near normal
|- style="background:Cyan;"
|1982
|31.5025
|6
|2
|1
|Below normal
|- style="background:Cyan;"
|1983
|17.4025
|4
|3
|1
|Below normal
|-
|1984
|84.295
|13
|5
|1
|Near normal
|-
|1985
|87.9825
|11
|7
|3
|Near normal
|- style="background:Cyan;"
|1986
|35.7925
|6
|4
|0
|Below normal
|- style="background:Cyan;"
|1987
|34.36
|7
|3
|1
|Below normal
|-
|1988
|102.9925
|12
|5
|3
|Near normal
|- style="background:Gold;"
|1989
|135.125
|11
|7
|2
|Above normal
|-
|1990
|96.8025
|14
|8
|1
|Near normal
|- style="background:Cyan;"
|1991
|35.5375
|8
|4
|2
|Below normal
|-
|1992
|76.2225
|7
|4
|1
|Near normal
|- style="background:Cyan;"
|1993
|38.665
|8
|4
|1
|Below normal
|- style="background:Cyan;"
|1994
|32.02
|7
|3
|0
|Below normal
|- style="background:Salmon;"
|1995
|227.1025
|19
|11
|5
|Extremely active
|- style="background:Salmon;"
|1996
|166.1825
|13
|9
|6
|Extremely active
|- style="background:Cyan;"
|1997
|40.9275
|8
|3
|1
|Below normal
|- style="background:Salmon;"
|1998
|181.7675
|14
|10
|3
|Extremely active
|- style="background:Salmon;"
|1999
|176.5275
|12
|8
|5
|Extremely active
|-
|2000
|119.1425
|15
|8
|3
|Near normal
|-
|2001
|110.32
|15
|9
|4
|Near normal
|- style="background:Cyan;"
|2002
|67.9925
|12
|4
|2
|Below normal
|- style="background:Salmon;"
|2003
|176.84
|16
|7
|3
|Extremely active
|- style="background:Salmon;"
|2004
|226.88
|15
|9
|6
|Extremely active
|- style="background:Salmon;"
|2005
|245.3
|28
|15
|7
|Extremely active
|-
|2006
|78.535
|10
|5
|2
|Near normal
|-
|2007
|73.885
|15
|6
|2
|Near normal
|- style="background:Gold;"
|2008
|145.7175
|16
|8
|5
|Above normal
|- style="background:Cyan;"
|2009
|52.58
|9
|3
|2
|Below normal
|- style="background:Salmon;"
|2010
|165.4825
|19
|12
|5
|Extremely active
|- style="background:Gold;"
|2011
|126.3025
|19
|7
|4
|Above normal
|- style="background:Gold;"
|2012
|132.6325
|19
|10
|2
|Above normal
|- style="background:Cyan;"
|2013
|36.12
|14
|2
|0
|Below normal
|-- style="background:Cyan;"
|2014
|66.725
|8
|6
|2
|Below normal
|- style="background:Cyan;"
|2015
|62.685
|11
|4
|2
|Below normal
|- style="background:Gold;"
|2016
|141.2525
|15
|7
|4
|Above normal
|- style="background:Salmon;"
|2017
|224.8775
|17
|10
|6
|Extremely active
|- style='background:Gold;"
|2018
|132.5825
|15
|8
|2
|Above normal
|- style='background:Gold;"
|2019
|132.2025
|18
|6
|3
|Above normal
|- style='background:Salmon;"
|2020
|180.3725
|30
|14
|7
|Extremely active
|- style='background:Gold;"
|2021
|145.5575
|21
|7
|4
|Above normal
|- style=
|2022
|94.4225
|14
|8
|2
|Near normal
|- style='background:Gold;"
|2023
|145.5565
|20
|7
|3
|Above normal
|- style='background:Salmon;'
|2024
|161.5825
|18
|11
|5
|Extremely active
|- style='background:Gold;"
|2025
|130.8
|13
|5
|4
|Above normal
|}
Eastern Pacific
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. 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.
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.
{| class="wikitable sortable"
!Storm
!Year
!Peak classification
!ACE
!Duration
|-
|Hurricane Fico
|1978
|bgcolor=#|
|62.8
|20 days
|-
|Hurricane John
|1994
|bgcolor=#|
|54.0<!-- Only includes ACE while east of 180W -->
|19 days<!-- Only includes time spent while east of 180W -->
|-
|Hurricane Kevin
|1991
|bgcolor=#|
|52.1
|17 days
|-
|Hurricane Hector
|2018
|bgcolor=#|
|50.5<!-- Only includes ACE while east of 180W -->
|13 days<!-- Only includes time spent while east of 180W -->
|-
|Hurricane Dora
|2023
|bgcolor=#|
|48.4<!-- Only includes ACE while east of 180W -->
|12 days<!-- Only includes ACE while east of 180W -->
|-
|Hurricane Tina
|1992
|bgcolor=#|
|47.7
|22 days
|-
|Hurricane Trudy
|1990
|bgcolor=#|
|45.8
|16 days
|-
|Hurricane Lane
|2018
|bgcolor=#|
|44.2
|13 days
|-
|Hurricane Dora
|1999
|bgcolor=#|
|41.4<!-- Only includes ACE while east of 180W -->
|13 days<!-- Only includes time spent while east of 180W -->
|-
|Hurricane Jimena
|2015
|bgcolor=#|
|40.0
|15 days
|-
|Hurricane Guillermo
|1997
|bgcolor=#|
|40.0
|16 days
|-
|Hurricane Norbert
|1984
|bgcolor=#|
|39.6
|12 days
|-
|Hurricane Norman
|2018
|bgcolor=#|
|36.6
|12 days
|-
|Hurricane Celeste
|1972
|bgcolor=#|
|36.3
|16 days
|-
|Hurricane Sergio
|2018
|bgcolor=#|
|35.5
|13 days
|-
|Hurricane Lester
|2016
|bgcolor=#|
|35.4
|14 days
|-
|Hurricane Olaf
|2015
|bgcolor=#|
|34.6
|12 days
|-
|Hurricane Jimena
|1991
|bgcolor=#|
|34.5
|12 days
|-
|Hurricane Doreen
|1973
|bgcolor=#|
|34.3
|16 days
|-
|Hurricane Ioke
|2006
|bgcolor=#|
|34.2<!-- Only includes ACE while east of 180W -->
|7 days<!-- Only includes time spent while east of 180W -->
|-
|Hurricane Marie
|1990
|bgcolor=#|
|33.1
|14 days
|-
|Hurricane Orlene
|1992
|bgcolor=#|
|32.4
|12 days
|-
|Hurricane Greg
|1993
|bgcolor=#|
|32.3
|13 days
|-
|Hurricane Hilary
|2011
|bgcolor=#|
|31.2
|9 days
|-
|Hurricane Kiko
|2025
|bgcolor=#|
|30.8
|9 days
|-
|}
– 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">
</div>
Data on ACE is considered reliable starting with the 1971 season.
Classification criteria
{| class="wikitable sortable mw-collapsible"
|+ Accumulated Cyclone Energy - Pacific
! scope="col" | Season
! scope="col" | ACE
! scope="col" | TS
! scope="col" | HU
! scope="col" | MH
! scope="col" | Classification
|- style="background:gold;"
!1971
|139
|18
|12
|6
|Above normal
|- style="background:gold;"
!1972
|136
|14
|8
|4
|Above normal
|- style="background:Gold;"
!1973
|114
|12
|7
|3
|Above normal
|-
!1974
|90
|18
|11
|3
|Near normal
|- style="background:Gold;"
!1975
|112
|17
|9
|4
|Above normal
|- style="background:Gold;"
!1976
|121
|15
|9
|5
|Above normal
|- style="background:Cyan;"
!1977
|22.3
|8
|4
|0
|Below normal
|- style="background:Salmon;"
!1978
|207.7
|19
|14
|7
|Extremely active
|- style="background:Cyan;"
!1979
|57.4
|10
|6
|4
|Below normal
|- style="background:white;"
!1980
|77
|14
|7
|3
|Near normal
|- style="background:Cyan;"
!1981
|72.8
|15
|8
|1
|Below normal
|- style="background:Gold;"
!1982
|161
|23
|12
|5
|Above normal
|- style="background:Salmon;"
!1983
|206.2
|21
|12
|8
|Extremely active
|- style="background:Salmon;"
!1984
|193.7
|21
|13
|7
|Extremely active
|- style="background:Salmon;"
!1985
|193.1
|24
|13
|8
|Extremely active
|- style="background:white;"
!1986
|107
|17
|9
|3
|Near normal
|- style="background:Gold;"
!1987
|132
|20
|10
|4
|Above normal
|- style="background:Gold;"
!1988
|127.5
|15
|7
|3
|Above normal
|- style="background:white;"
!1989
|110
|17
|9
|4
|Near normal
|- style="background:Salmon;"
!1990
|249.5
|21
|16
|6
|Extremely active
|- style="background:Salmon;"
!1991
|178.9
|14
|10
|5
|Extremely active
|- style="background:Salmon;"
!1992
|294.6
|27
|16
|10
|Extremely active
|- style="background:Salmon;"
!1993
|201.8
|15
|11
|9
|Extremely active
|- style="background:Salmon;"
!1994
|185.2
|20
|10
|5
|Extremely active
|-
!1995
|100.2
|10
|7
|3
|Near normal
|- style="background:cyan;"
!1996
|53.5
|9
|5
|2
|Below normal
|- style="background:gold;"
!1997
|167.9
|19
|9
|7
|Above normal
|- style="background:gold;"
!1998
|134
|13
|9
|6
|Above normal
|- style="background:white;"
!1999
|90.2
|9
|6
|2
|Near normal
|-
!2000
|95.9
|19
|6
|2
|Near normal
|- style="background:white;"
!2001
|90.6
|15
|8
|2
|Near normal
|- style="background:gold;"
!2002
|124.4
|16
|8
|6
|Above normal
|- style="background:Cyan;"
!2003
|56.6
|16
|7
|0
|Below normal
|- style="background:Cyan;"
!2004
|71.1
|12
|6
|3
|Below normal
|-
!2005
|96.6
|15
|7
|2
|Near normal
|- style="background:gold;"
!2006
|156.9
|19
|11
|6
|Above normal
|- style="background:Cyan;"
!2007
|52.6
|11
|4
|1
|Below normal
|- style="background:white;"
!2008
|83.8
|17
|7
|2
|Near normal
|- style="background:Gold;"
!2009
|126.4
|20
|8
|5
|Above normal
|- style="background:Cyan;"
!2010
|51
|8
|3
|2
|Below normal
|- style="background:Gold;"
!2011
|120.9
|11
|10
|6
|Above normal
|-
!2012
|98.5
|17
|10
|5
|Near normal
|- style="background:cyan;"
!2013
|74.9
|20
|9
|1
|Below normal
|- style="background:Salmon;"
!2014
|202.4
|22
|16
|9
|Extremely active
|- style="background:Salmon;"
!2015
|290.6
|26
|16
|11
|Extremely active
|- style="background:Salmon;”"
!2016
|184.8
|22
|13
|6
|Extremely active
|-
!2017
|100.8
|18
|9
|4
|Near normal
|- style="background:Salmon;"
!2018
|318.1
|23
|13
|10
|Extremely active
|-
!2019
|97.6
|19
|7
|4
|Near normal
|- style="background:white;"
!2020
|77.2
|17
|4
|3
|Near normal
|-
!2021
|94.5
|19
|8
|2
|Near normal
|- style="background:Gold;”"
!2022
|114.6
|19
|10
|4
|Above normal
|- style="background:gold;”"
!2023
|165.9
|17
|10
|8
|Above normal
|- style="background:white;"
!2024
|84.6
|14
|5
|3
|Near normal
|- style="background:gold;”"
!2025
|127.3
|20
|11
|5
|Above normal
|}
Western Pacific
{| class="wikitable" style="float:right"
!TSR forecasts
Date
!Tropical
storms
!Total
Typhoons
!Intense
TCs
!
!
|-
|<small>Average (1991–2020)</small>
|25.5
|16.0
|9.3
|301
|
|}
{| 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: 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.
{| class="wikitable sortable"
|+ Top 5 North Indian Ocean cyclone seasons
! scope="col" | Season
! scope="col" | D
! scope="col" | DD
! scope="col" | CS
! scope="col" | SCS
! scope="col" | VSCS
! scope="col" | ESCS
! scope="col" | SUCS
! scope="col" | ACE
|-
| 2019 || 12 || 11 || 8 || 6 || 6 || 3 || 1 || 93
|-
| 2023 || 9 || 7 || 6 || 5 || 4 || 3 || 0 || 57.5
|-
| 2007 || 11 || 8 || 4 || 2 || 2 || 2 || 1 || 46.1
|-
| 2013 || 10 || 6 || 5 || 4 || 3 || 1 || 0 || 45.6
|-
| 1999 || 10 || 8 || 5 || 3 || 3 || 2 || 1 || 44.3
|-
! colspan=9| References: