Northern California may experience significant weather changes this fall and winter as La Niña conditions are expected to develop and persist through the 2024-25 season. According to the National Weather Service, La Niña is likely to develop between September and November, with the chance rising significantly during the peak winter months of November through January.
La Niña, a climate pattern characterized by cooler-than-average sea surface temperatures in the central and eastern Pacific Ocean, typically impacts weather patterns across the United States. Yet for Northern California, La Niña years often bring variable weather conditions.
Historically, La Niña has been associated with an increased risk of extreme weather in Northern California. The National Weather Service’s analysis of data since 1950 indicates that during La Niña episodes, Northern California experiences either extremely wet or dry conditions. Specifically, these conditions fall within the highest or lowest 20% of the 100-year weather record.
The potential impacts of La Niña include fluctuating precipitation levels, which could lead to either drought conditions or heavy rainfall and flooding. The National Weather Service will continue to monitor conditions and provide updates on expected impacts throughout the season.
Photo: NOAA Prediction Center
