Northwest River Forecast Center: ENSO Runoff Analysis
1951
2024
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Climate Index

Description The Oceanic Nino Index (ONI) is the 3 month running average of the sea surface temperature (SST) anomaly for the Nino 3.4 region. The ONI is used by NOAA to make official ENSO phase classifications. Source: ONI index is courtesy of NOAA's Climate Prediction Center (Click Here)