Northern California Water Resources Dashboard

The 2025–26 water year in Northern California tells a story of dramatic swings — a pattern scientists call weather whiplash. The season opened slowly with scant October–November precipitation, then atmospheric rivers in late December sent reservoir levels surging. A bone-dry January eroded snowpack gains, dropping the statewide pack from 89% to 59% of average in three weeks. Mid-February brought the third-snowiest 5-day period on record at the UC Berkeley Central Sierra Snow Lab (111 inches), pushing statewide snowpack back toward ~97% of average by late February.