Trinity County Climate
Trinity County, California
Avg Annual Temp
56.0°F
Annual Precip
35.3"
Annual Snowfall
5.9"
Extreme Heat Days
84.26666666666667
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Trinity County Weather
Above average national warmth
Trinity County’s 56.0°F average annual temperature is slightly higher than the national median. Despite its mountainous reputation, the county maintains a warmer profile than many northern U.S. regions. It bridges the gap between mountain cool and valley heat.
Cooler than the California norm
The county’s 56.0°F average is nearly three degrees cooler than the state average of 58.7°F. Its rugged terrain and elevation keep it from reaching the high averages of the coastal or desert counties. This makes it a cool-climate outlier in the Golden State.
High heat in the mountains
Surprisingly, Trinity sees 84 extreme heat days per year, nearly as many as the Central Valley. It receives 35.3 inches of annual rain, far more than the state average of 25.8 inches. This mix of high heat and high rain creates a unique ecological pocket.
Snowy winters and scorching summers
Trinity experiences 5.9 inches of annual snowfall and a winter average of 41.8°F. However, summer heat is intense, with an average of 71.5°F and frequent spikes over 90°F. The seasons are characterized by high contrast and dramatic shifts.
Invest in dual-season preparation
Residents need both reliable heating for snowy 41°F winters and powerful AC for 84 days of extreme heat. All-weather vehicle gear is recommended for the nearly six inches of snow. Yard maintenance should account for the heavy 35.3 inches of annual rainfall.
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.