ENSO Longitude Index* (ELI)
 Jan Null, CCM
Updated thru March 2024
 
ELI values and ENSO Type
 WE=Weak El Niño, ME=Moderate El Niño, SE=Strong El Niño, VSE=Very Strong El Niño
WL=Weak La Niña, ML=Moderate La Niña, SL=Strong La Niña
ENSO Type Season Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun
  1950-1951 167.5 169.3 168.8 162.8 157.8 157.4 159.6 157.1 155.5 160.5 163.7 172.7
ME 1951-1952 180.3 176.9 172.6 169.5 165.8 160.8 159.9 158.9 156.6 160.3 165.7 167.8
WE 1952-1953 170.6 171.1 168.2 166.3 162.6 162.5 161.4 161.0 158.6 165.4 172.9 175.4
WE 1953-1954 174.7 176.3 175.8 168.9 166.2 165.6 165.2 160.7 158.9 158.7 163.8 167.2
WL 1954-1955 169.3 166.5 164.2 161.7 162.4 158.6 155.5 153.6 148.3 151.2 162.8 166.1
ML 1955-1956 167.6 166.2 165.5 159.4 156.1 155.3 153.0 154.4 151.7 150.4 154.4 163.1
  1956-1957 168.6 169.8 166.8 163.0 162.0 160.8 158.4 157.3 161.5 161.1 174.4 180.9
SE 1957-1958 184.0 180.5 176.9 172.4 170.4 171.6 173.8 172.2 171.9 173.2 178.1 178.8
WE 1958-1959 174.6 172.8 170.2 168.1 167.3 164.9 166.2 164.5 163.7 160.3 160.3 169.4
  1959-1960 169.8 169.0 166.8 164.6 160.1 160.0 157.2 155.7 154.6 154.9 161.1 169.0
  1960-1961 170.5 172.1 169.5 165.9 163.8 161.2 160.0 159.3 152.4 150.7 158.0 172.6
  1961-1962 172.1 169.3 166.3 164.1 162.4 158.2 155.1 155.6 150.9 151.8 157.1 164.7
  1962-1963 168.9 168.7 165.6 162.0 160.5 158.6 155.7 153.6 155.5 151.0 152.9 168.6
ME 1963-1964 175.4 174.4 172.6 170.3 167.9 168.6 164.6 160.6 151.8 150.6 160.4 163.5
WL 1964-1965 167.3 166.5 164.0 161.5 157.1 156.9 157.6 157.9 153.7 153.5 171.4 180.3
SE 1965-1966 185.3 180.2 175.7 174.5 172.6 171.8 169.3 165.6 170.7 163.6 164.1 171.0
  1966-1967 171.7 171.5 168.2 164.9 163.4 162.4 157.0 156.4 156.0 155.3 159.3 170.3
  1967-1968 172.3 171.1 167.4 166.7 165.1 164.1 161.6 159.3 156.0 156.4 159.0 170.8
ME 1968-1969 172.5 170.0 167.4 165.0 166.6 165.8 165.2 169.8 166.6 164.3 171.0 173.1
WE 1969-1970 172.3 171.6 170.3 167.8 164.4 162.0 158.4 158.4 154.7 159.4 163.8 167.0
ENSO Type Season Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun
ML 1970-1971 167.1 165.3 164.2 162.4 161.2 156.5 152.0 153.1 150.1 145.9 152.0 161.4
WL 1971-1972 165.4 167.3 166.6 162.7 160.9 160.0 156.8 157.6 159.0 163.0 170.4 175.7
SE 1972-1973 183.5 183.3 177.3 174.5 173.8 172.8 173.8 168.2 159.8 153.0 157.1 159.2
SL 1973-1974 160.4 161.4 158.5 155.2 153.9 151.9 151.5 153.4 152.5 159.5 151.6 156.8
WL 1974-1975 165.4 167.8 166.5 163.6 159.3 157.7 158.4 157.8 156.5 157.2 150.6 158.0
SL 1975-1976 158.7 158.4 160.3 156.3 153.1 152.5 152.7 153.4 153.2 157.1 159.1 171.5
WE 1976-1977 178.2 179.1 175.9 170.6 168.8 162.4 163.3 157.9 158.9 155.9 161.2 169.6
WE 1977-1978 172.2 170.4 171.0 169.3 166.5 166.2 164.4 161.0 154.6 153.0 159.3 165.9
  1978-1979 167.7 166.9 164.7 163.5 160.7 160.8 159.7 155.7 153.5 153.5 159.8 166.2
WE 1979-1980 168.9 171.4 170.1 165.3 162.7 161.2 161.2 159.7 158.7 156.3 161.4 171.8
  1980-1981 169.7 169.0 166.2 164.4 161.1 160.6 159.0 155.7 155.0 151.4 155.2 163.9
  1981-1982 166.0 167.1 166.3 160.6 159.6 159.0 158.0 154.8 155.0 160.0 171.0 174.9
VSE 1982-1983 176.8 180.5 180.5 178.3 176.6 181.9 189.1 203.4 220.3 213.4 187.5 183.1
WL 1983-1984 179.8 173.5 165.9 162.3 159.8 157.4 154.3 152.5 151.1 149.9 157.7 163.5
WL 1984-1985 168.2 168.5 164.0 160.9 156.7 156.6 156.1 153.5 147.8 146.5 153.2 161.2
  1985-1986 166.1 166.5 164.0 163.5 161.8 160.6 158.4 156.4 153.7 152.6 154.7 163.4
ME 1986-1987 168.9 172.1 169.8 169.9 168.9 168.5 168.9 171.3 176.3 163.2 165.8 173.7
SE 1987-1988 176.5 177.4 176.5 169.2 165.9 163.8 162.4 157.4 153.9 151.2 157.1 159.2
SL 1988-1989 160.9 162.4 161.7 155.1 154.8 152.3 152.5 151.5 149.5 146.9 153.3 158.7
  1989-1990 164.0 165.0 163.7 161.7 161.5 160.0 159.3 159.3 157.0 154.2 156.9 166.1
ENSO Type Season Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun
  1990-1991 169.4 169.3 167.2 165.1 163.2 163.6 161.1 161.2 161.1 156.4 161.1 171.4
SE 1991-1992 174.6 172.7 169.9 169.4 170.1 171.9 174.4 176.5 182.7 185.7 179.3 177.0
  1992-1993 172.3 170.9 167.1 162.9 163.9 164.2 163.2 162.9 162.3 171.3 176.6 176.4
  1993-1994 172.7 173.4 168.7 164.3 161.9 160.8 157.0 157.4 157.1 158.9 163.5 172.1
ME 1994-1995 170.9 171.9 170.8 167.6 167.4 167.2 164.7 162.8 161.5 160.7 162.0 165.2
ML 1995-1996 166.2 165.7 165.0 162.2 158.2 156.7 154.9 152.2 153.1 150.0 157.7 162.2
  1996-1997 164.9 166.1 163.7 161.9 161.1 159.4 159.0 159.3 159.8 162.0 171.7 183.3
VSE 1997-1998 187.9 189.7 188.1 185.2 181.2 184.0 195.3 209.1 224.0 209.6 174.8 165.4
SL 1998-1999 164.5 163.9 160.9 155.9 153.2 152.4 150.0 149.6 147.8 144.9 149.5 156.8
SL 1999-2000 158.0 161.7 161.4 160.0 156.0 154.0 152.4 147.3 144.6 146.7 151.8 160.7
WL 2000-2001 164.7 164.1 162.1 160.3 157.0 155.7 153.0 150.1 147.0 145.6 153.0 161.8
  2001-2002 167.9 168.2 165.4 163.8 161.0 160.2 160.1 160.6 161.4 156.3 159.2 170.3
ME 2002-2003 172.2 171.1 171.3 169.5 169.0 166.2 161.4 161.7 160.6 155.8 157.6 163.4
  2003-2004 169.3 167.3 165.6 164.4 159.2 158.0 157.4 157.3 152.1 153.1 163.0 170.8
WE 2004-2005 172.8 173.8 170.5 166.9 163.8 163.0 161.6 159.4 158.3 157.3 161.8 165.2
WL 2005-2006 165.1 165.8 164.6 162.5 160.6 158.4 155.1 154.7 150.7 150.0 156.0 163.5
WE 2006-2007 168.1 171.5 170.5 168.9 165.0 163.8 159.8 158.9 156.4 155.4 157.5 162.2
SL 2007-2008 165.7 166.2 162.7 159.5 158.0 157.2 151.4 153.3 151.2 155.3 153.7 157.0
WL 2008-2009 166.7 169.1 164.4 160.3 156.5 154.4 151.5 150.4 149.1 150.2 154.5 164.7
ME 2009-2010 170.9 172.4 168.5 167.4 168.8 169.2 167.2 167.9 163.1 154.9 155.7 158.4
ENSO Type Season Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun
SL 2010-2011 160.9 159.0 157.9 155.1 153.5 153.1 151.6 151.1 147.4 148.8 149.6 161.3
ML 2011-2012 166.0 164.1 163.3 159.7 157.0 155.5 153.0 155.5 154.5 158.9 152.4 163.9
  2012-2013 172.6 170.9 167.5 165.0 161.7 158.6 156.5 155.3 148.4 149.3 158.2 163.6
  2013-2014 166.1 166.4 165.3 161.9 160.0 158.8 158.3 158.3 158.0 154.6 157.9 168.2
WE 2014-2015 172.6 171.0 168.5 164.6 163.8 162.4 161.4 160.3 160.5 162.0 167.3 180.4
VSE 2015-2016 183.2 182.6 182.5 180.1 173.7 174.2 175.8 174.4 165.9 157.8 161.6 164.0
WL 2016-2017 163.7 161.5 159.9 156.8 156.2 156.6 155.7 157.3 160.2 154.1 158.2 166.8
WL 2017-2018 167.9 166.2 166.1 161.6 159.3 156.6 155.4 155.2 152.4 153.1 158.0 164.9
WE 2018-2019 168.0 167.8 167.2 166.2 163.9 162.1 160.9 164.8 161.9 157.4 162.4 169.2
  2019-2020 171.4 170.4 167.9 165.2 162.0 160.9 159.5 158.6 156.6 153.3 155.2 162.2
ML 2020-2021 164.8 163.5 163.2 158.9 155.4 153.6 153.3 153.0 150.2 149.6 155.1 161.0
ML 2021-2022 163.7 162.7 161.4 159.1 157.8 155.4 155.7 153.9 151.2 146.4 150.8 157.6
WL 2022-2023 162.6 164.0 162.2 159.2 157.7 154.6 153.3 154.0 162.5 153.9 160.8 173.8
  2023-2024 178.7 178.7 177.2 172.0 168.0 166.6 163.27 168.84 159.33      
ENSO Type Season Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun
* Diversity of ENSO Events Unified by Convective Threshold Sea Surface Temperature: A Nonlinear ENSO Index (https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2018GL079203 )
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