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File: enso-blog-evolution-of-la-nina-events-traditional-2024-12-12.png

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Alternate Text: Line graph of traditional sea surface temperature index showing that 2024's cool temperature anomaly has not officially crossed the La Niña threshold
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Line graph of traditional sea surface temperature index showing that 2024's cool temperature anomaly has not officially crossed the La Niña threshold

Image caption

How sea surface temperatures in the Niño-3.4 region of the tropical Pacific changed over the course of all La Niña events since 1950 (gray lines) and 2024 (black line). This shows the traditional calculation for Niño-3.4, the monthly temperature compared to the most recent 30-year average (1991–2020 for the 2024 line). By this measure, the La Niña threshold has not been crossed, and ENSO is still neutral. Climate.gov graph, based on data from Michelle L’Heureux from CPC using ERSSTv5.