December Storms Boost California Snowpack Amid Atmospheric River Event
Recent December storms brought significant snow to California, with the Phillips station in El Dorado County recording a snow depth of 24 inches. These storms were driven by an atmospheric river that resulted in record rainfall in Los Angeles and substantial snowfall in the mountainous regions.
Statewide snowpack currently stands at 71% of average, with Phillips snow water content at 50% of the average for this time of year and only 21% of the typical content by April 1. This marks the season's first measurement of snowpack, which constitutes about one-third of California's annual water supply.
Reservoir storage remains healthy, at 123% of average for this period. Earlier in December, warmer and drier conditions had delayed snow accumulation, but the recent storms have helped establish a solid base. Continued storm activity through winter and early spring is necessary to maintain and improve the snowpack levels.
For context, about a year ago, the Phillips snow water content was around 91% of average. In 2025, the snowpack was near average ahead of the April 1 peak, with reservoir levels above historic capacity after two consecutive wet winters.
