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HOME > Climate & Weather Linkage > El Niño / Southern Oscillation (ENSO) > Historical El Nino/ La Nina episodes (1950-present)
 
 
 
Changes to the Oceanic Niño Index (ONI)
Link to Previous Version of ONI (1971-2000 climatology)
 

Notice: Because of the high frequency filter applied to the ERSSTv3b data (Smith et al. 2008, J.Climate), ONI values may change up to two months after the initial "real time" value is posted. Therefore, the most recent ONI values should be considered an estimate.

DESCRIPTION: Warm (red) and cold (blue) episodes based on a threshold of +/- 0.5oC for the Oceanic Niño Index (ONI) [3 month running mean of ERSST.v3b SST anomalies in the Niño 3.4 region (5oN-5oS, 120o-170oW)], based on centered 30-year base periods updated every 5 years. For historical purposes cold and warm episodes (blue and red colored numbers) are defined when the threshold is met for a minimum of 5 consecutive over-lapping seasons.

 

Year

DJF

JFM

FMA

MAM

AMJ

MJJ

JJA

JAS

ASO

SON

OND

NDJ

1950

-1.4

-1.3

-1.2

-1.2

-1.1

-0.9

-0.6

-0.5

-0.4

-0.5

-0.6

-0.7

1951

-0.8

-0.6

-0.4

-0.2

0.0

0.4

0.6

1.0

1.1

1.2

1.1

0.9

1952

0.6

0.4

0.3

0.3

0.3

0.1

-0.1

0.0

0.2

0.2

0.2

0.3

1953

0.5

0.6

0.6

0.7

0.7

0.7

0.7

0.7

0.8

0.8

0.8

0.8

1954

0.7

0.5

0.1

-0.4

-0.5

-0.5

-0.6

-0.7

-0.8

-0.7

-0.7

-0.7

1955

-0.7

-0.7

-0.7

-0.8

-0.8

-0.8

-0.8

-0.7

-1.1

-1.4

-1.7

-1.6

1956

-1.1

-0.8

-0.6

-0.5

-0.5

-0.5

-0.5

-0.6

-0.5

-0.5

-0.5

-0.5

1957

-0.3

0.1

0.4

0.7

0.9

1.0

1.1

1.2

1.2

1.3

1.5

1.8

1958

1.8

1.6

1.2

0.9

0.7

0.6

0.5

0.3

0.3

0.4

0.5

0.6

1959

0.6

0.6

0.5

0.3

0.2

-0.1

-0.2

-0.3

-0.1

0.0

0.1

0.0

1960

-0.1

-0.2

-0.2

-0.1

-0.1

0.0

0.1

0.2

0.2

0.1

0.1

0.1

1961

0.0

0.0

0.0

0.1

0.3

0.4

0.2

-0.1

-0.3

-0.3

-0.2

-0.1

1962

-0.2

-0.3

-0.3

-0.3

-0.2

-0.2

0.0

-0.1

-0.2

-0.3

-0.4

-0.5

1963

-0.4

-0.2

0.1

0.3

0.3

0.5

0.8

1.1

1.2

1.3

1.4

1.3

1964

1.1

0.6

0.1

-0.4

-0.6

-0.6

-0.6

-0.7

-0.8

-0.8

-0.8

-0.8

1965

-0.6

-0.3

0.0

0.2

0.5

0.8

1.2

1.5

1.7

1.9

1.9

1.7

1966

1.4

1.1

0.9

0.6

0.4

0.3

0.3

0.1

0.0

-0.1

-0.1

-0.2

1967

-0.3

-0.4

-0.5

-0.4

-0.2

0.1

0.1

-0.1

-0.3

-0.3

-0.3

-0.4

1968

-0.6

-0.8

-0.7

-0.5

-0.2

0.1

0.4

0.5

0.5

0.6

0.8

1.0

1969

1.1

1.1

1.0

0.9

0.8

0.6

0.5

0.5

0.8

0.9

0.9

0.8

1970

0.6

0.4

0.4

0.3

0.1

-0.2

-0.5

-0.7

-0.7

-0.7

-0.8

-1.0

1971

-1.2

-1.3

-1.1

-0.8

-0.7

-0.7

-0.7

-0.7

-0.7

-0.8

-0.9

-0.8

1972

-0.6

-0.3

0.1

0.4

0.6

0.8

1.1

1.4

1.6

1.9

2.1

2.1

1973

1.8

1.2

0.6

-0.1

-0.5

-0.8

-1.0

-1.2

-1.3

-1.6

-1.9

-2.0

1974

-1.9

-1.6

-1.2

-1.0

-0.8

-0.7

-0.5

-0.4

-0.4

-0.6

-0.8

-0.7

1975

-0.5

-0.5

-0.6

-0.7

-0.8

-1.0

-1.1

-1.2

-1.4

-1.5

-1.6

-1.7

1976

-1.5

-1.1

-0.7

-0.5

-0.3

-0.1

0.2

0.4

0.6

0.7

0.8

0.8

1977

0.6

0.6

0.3

0.3

0.3

0.4

0.4

0.4

0.5

0.7

0.8

0.8

1978

0.7

0.5

0.1

-0.2

-0.3

-0.3

-0.3

-0.4

-0.4

-0.3

-0.1

-0.1

1979

-0.1

0.1

0.2

0.3

0.2

0.0

0.0

0.2

0.3

0.5

0.5

0.6

1980

0.5

0.4

0.3

0.3

0.4

0.4

0.3

0.1

-0.1

0.0

0.0

-0.1

1981

-0.4

-0.6

-0.5

-0.4

-0.3

-0.3

-0.4

-0.4

-0.3

-0.2

-0.2

-0.1

1982

-0.1

0.0

0.1

0.3

0.5

0.7

0.7

1.0

1.5

1.9

2.1

2.2

1983

2.2

1.9

1.5

1.2

0.9

0.6

0.2

-0.2

-0.5

-0.8

-0.9

-0.8

1984

-0.5

-0.3

-0.3

-0.4

-0.5

-0.5

-0.3

-0.2

-0.3

-0.6

-0.9

-1.1

1985

-1.0

-0.9

-0.7

-0.7

-0.7

-0.6

-0.5

-0.5

-0.5

-0.4

-0.4

-0.4

1986

-0.5

-0.4

-0.2

-0.2

-0.1

0.0

0.3

0.5

0.7

0.9

1.1

1.2

1987

1.2

1.3

1.2

1.1

1.0

1.2

1.4

1.6

1.6

1.5

1.3

1.1

1988

0.8

0.5

0.1

-0.2

-0.8

-1.2

-1.3

-1.2

-1.3

-1.6

-1.9

-1.9

1989

-1.7

-1.5

-1.1

-0.8

-0.6

-0.4

-0.3

-0.3

-0.3

-0.3

-0.2

-0.1

1990

0.1

0.2

0.3

0.3

0.2

0.2

0.3

0.3

0.4

0.3

0.4

0.4

1991

0.3

0.2

0.2

0.3

0.5

0.7

0.8

0.7

0.7

0.8

1.2

1.4

1992

1.6

1.5

1.4

1.2

1.0

0.7

0.3

0.0

-0.2

-0.3

-0.2

0.0

1993

0.2

0.3

0.5

0.6

0.6

0.5

0.3

0.2

0.2

0.2

0.1

0.1

1994

0.1

0.1

0.2

0.3

0.4

0.4

0.4

0.4

0.5

0.7

1.0

1.2

1995

1.0

0.8

0.6

0.3

0.2

0.0

-0.2

-0.4

-0.7

-0.8

-0.9

-0.9

1996

-0.9

-0.8

-0.6

-0.4

-0.3

-0.2

-0.2

-0.3

-0.3

-0.3

-0.4

-0.5

1997

-0.5

-0.4

-0.1

0.2

0.7

1.2

1.5

1.8

2.1

2.3

2.4

2.3

1998

2.2

1.8

1.4

0.9

0.4

-0.2

-0.7

-1.0

-1.2

-1.3

-1.4

-1.5

1999

-1.5

-1.3

-1.0

-0.9

-0.9

-1.0

-1.0

-1.1

-1.1

-1.3

-1.5

-1.7

2000

-1.7

-1.5

-1.2

-0.9

-0.8

-0.7

-0.6

-0.5

-0.6

-0.6

-0.8

-0.8

2001

-0.7

-0.6

-0.5

-0.4

-0.2

-0.1

0.0

0.0

-0.1

-0.2

-0.3

-0.3

2002

-0.2

0.0

0.1

0.3

0.5

0.7

0.8

0.8

0.9

1.2

1.3

1.3

2003

1.1

0.8

0.4

0.0

-0.2

-0.1

0.2

0.4

0.4

0.4

0.4

0.3

2004

0.3

0.2

0.1

0.1

0.2

0.3

0.5

0.7

0.8

0.7

0.7

0.7

2005

0.6

0.4

0.3

0.3

0.3

0.3

0.2

0.1

0.0

-0.2

-0.5

-0.8

2006

-0.9

-0.7

-0.5

-0.3

0.0

0.1

0.2

0.3

0.5

0.8

1.0

1.0

2007

0.7

0.3

-0.1

-0.2

-0.3

-0.3

-0.4

-0.6

-0.8

-1.1

-1.2

-1.4

2008

-1.5

-1.5

-1.2

-0.9

-0.7

-0.5

-0.3

-0.2

-0.1

-0.2

-0.5

-0.7

2009

-0.8

-0.7

-0.5

-0.2

0.2

0.4

0.5

0.6

0.8

1.1

1.4

1.6

2010

1.6

1.3

1.0

0.6

0.1

-0.4

-0.9

-1.2

-1.4

-1.5

-1.5

-1.5

2011

-1.4

-1.2

-0.9

-0.6

-0.3

-0.2

-0.2

-0.4

-0.6

-0.8

-1.0

-1.0

2012

-0.9

-0.6

-0.5

-0.3

-0.2

0.0

0.1

0.4

0.5

0.6

0.2

-0.3

2013

-0.6

-0.6

-0.4

-0.2

-0.2

-0.3

-0.3

-0.3

-0.3

-0.2

-0.3

-0.4

2014

-0.6

-0.6

-0.5

-0.1

0.1

0.1

0.0

0.0

0.2

0.5

 

 


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Page last modified: December 4, 2014
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