Sierra County Climate
Sierra County, California
Avg Annual Temp
53.1°F
Annual Precip
46.3"
Annual Snowfall
26.2"
Extreme Heat Days
52.5
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Sierra County Weather
A Cooler Mountainous Environment
With an average temperature of 53.1°F, Sierra County is cooler than the national median. Its high elevation creates a climate that is distinct from the rest of the California coast.
One of California's Coldest Regions
Sierra sits well below the California average of 58.7°F. It is one of the wettest counties in the state, receiving 46.3 inches of precipitation annually.
High Precipitation and Heavy Snowfall
Sierra receives 46.3 inches of rain and 26.2 inches of snow, far exceeding neighbors like Siskiyou. It is one of the most precipitation-heavy regions in the entire state.
Snowy Winters with Hot Summer Peaks
Winter temperatures average a cold 39.4°F, contributing to the 26.2 inches of annual snow. Despite this, the county still faces 53 days of extreme heat over 90°F in the summer.
Gear Up for Serious Winter Weather
Snow tires and high-grade home insulation are essential for the snowy 39.4°F winters. Residents should also prepare for the 53 days of high heat by ensuring homes are well-ventilated.
Frequently Asked Questions
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Data source: NOAA National Centers for Environmental Information (NCEI), U.S. Climate Normals 1991-2020.
Climate normals are 30-year averages of weather variables computed from 1991 to 2020. Station data is aggregated to county level using spatial averaging. Data is informational only — not a substitute for official National Weather Service forecasts or emergency weather warnings.