Image caption
2-year history of sea surface temperatures in the Niño-3.4 region of the tropical Pacific for all La Nina events since 1950 (gray lines) and the recent (2024-25) event (purple line). After staying in neutral for most of 2024, the Niño-3.4 index passed the La Niña threshold in December 2024. Graph by Emily Becker based on monthly Niño-3.4 index data from CPC using ERSSTv5.