California’s snowpack usually reaches its peak in the early spring each year near the first of April. Melting of the snowpack increases as the sun’s path across the sky moves a little northward each day and solar radiation intensifies on the ground.

Snowpack surveys by the Department of Water Resource (DWR) in late March and early April are indicators of how much water California will reap from the melting snowpack, which in normal years provides about 30 percent of the state’s water.