Cold & Warm Episodes by Season for the Oceanic Niño Index (ONI)

Due to a significant warming trend in the Niño-3.4 region since 1950, El Niño and La Niña episodes that are defined by a single fixed 30-year base period (e.g. 1981-2010) are increasingly incorporating longer-term trends that do not reflect interannual ENSO variability. In order to remove this warming trend, CPC is adopting a new strategy to update the base period.
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cold-warm-episodes-by-season-for-the-oceanic-nino-index-oni
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