Snow in San Dimas, California Winter storm alerts · 7-day snow forecast · average snowfall

Measurable snow is rare in San Dimas: the 1991–2020 normal rounds to zero — only a trace in most years, and nights reach freezing on about 3 days a year. When snow or ice does arrive, it causes outsized trouble because roads are rarely treated — watch for Winter Weather Advisories and Freeze Warnings.

Winter by month

NOAA NCEI U.S. Climate Normals 1991–2020 — snowfall at Pomona/Fairplex (3 mi from the city center, +33 ft elevation difference). Averages smooth out big years: single winters can bring half or double the normal.

Winter weather map around San Dimas

Nearby cities

All California winter alerts and cities → · National winter storm map → · Frost dates by ZIP code →

Questions

How much snow does San Dimas get a year?

0 inches in an average year (NOAA U.S. Climate Normals 1991–2020, Pomona/Fairplex station, 3 miles away).

Is there a winter storm warning for San Dimas today?

This page checks the National Weather Service for active alerts at San Dimas's location every time you open it; the box at the top lists any winter storm, winter weather, cold or freeze alert in effect right now.

How many freezing nights does San Dimas have?

About 3 nights a year drop to 32 °F or below (NOAA 1991–2020); the coldest month, December, averages a low of 42 °F.