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) winter (purple line). The Niño-3.4 index has been near average for the past three months. Graph by Emily Becker based on monthly Niño-3.4 index data from CPC using ERSSTv5.