Trinity County Climate
Trinity County, California
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
56.0°F
Annual Precip
35.3"
Annual Snowfall
5.9"
Extreme Heat Days
84
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
8b
Minimum winter temperature range for plant survival
3,285
Supports most vegetables & fruits
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Trinity County
Climate Verdict
Trinity County has a mild, with an average annual temperature of 56.0°F, moderate rainfall of 35.3 inches per year, significant summer heat with 84.26666666666667 days annually above 90°F, light snow averaging 5.9 inches per year. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are mild, with January temperatures averaging 41.2°F. summers are warm — July averages 74.4°F. The 33°F seasonal variation provides noticeable but manageable change. December is typically the coldest month and July the warmest.
Outdoor & Gardening Guidance
Summer outdoor activities should be planned for early morning or evening to avoid extreme heat.
Regional Context
Trinity County closely matches the California statewide average temperature of 58.7°F, it is also noticeably wetter, receiving 9.5 inches more precipitation than the state average, the county experiences 25.59574170373279 more extreme heat days than the state average.
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 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.