The International Research Institute (IRI) provides historical Niño 3.4 sea-surface-temperature anomaly data.
Sources
- El Niño Today | El Nino Theme Page - A comprehensive Resource (pmel.noaa.gov)
- https://iri.columbia.edu/our-expertise/climate/forecasts/enso/current/ (iri.columbia.edu)
- https://www.climate.gov/news-features/understanding-climate/climate-variability-oceanic-nino-index (climate.gov)
- https://www.webberweather.com/ensemble-oceanic-nino-index.html (webberweather.com)
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