Tuesday, July 22, 2025

Trend for Oceanic Nino Index, revised, 1951-2024

 This revision incorporates data revisions since the 2004-05 season, now to two decimal places instead of one starting in season 2005-06.

Conclusions remain unchanged from previously: overall anomaly trend is slightly cooler, forecasting a drier West Coast and wetter Great Lakes region; cool anomaly seasons are trending slightly less severe, and the trend of warm anomaly seasons trending higher may have been broken, but only time will tell.