weatherbycounty

California Climate Data

NOAA 30-year climate normals for all 58 counties.

NOAA NCEI 1991-2020 Climate Normals

State Avg Temp

58.3°F

Hottest County

Imperial County

73.7°F avg

Coldest County

Alpine County

34.9°F avg

Wettest County

Del Norte County

74.6" precip

Data sources: NOAA National Centers for Environmental Information (NCEI), U.S. Climate Normals 1991-2020. Forecast and alert data from National Weather Service API. Air quality data from Open-Meteo.

Climate normals are 30-year averages of weather variables. Station data is aggregated to county level. Forecasts and alerts are fetched live and may change frequently. Data is informational only — not a substitute for official National Weather Service forecasts or emergency weather warnings.