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HOME > Climate & Weather Linkage > El Niño Southern Oscillation (ENSO) > Oceanic Niño Index (ONI): Historical El Niño / La Niña episodes (1950–Present)


Cold & Warm Episodes by Season(ERSSTv5)

Oceanic Niño Index (ONI):
Historical El Niño / La Niña episodes (1950–Present)

This page has moved. The Oceanic Niño Index (ONI) table based on ERSST version 6 is available at:
https://www.cpc.ncep.noaa.gov/products/analysis_monitoring/enso/oni/v6/

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Note: Per NWS Public Information Statement 26-05, the Relative Oceanic Niño index (RONI) is used for official monitoring and prediction of the El Niño-Southern Oscillation (ENSO) phenomenon.

The older Oceanic Niño Index based on version 5 of ERSST is available here.