Climate change in Trinity County, California
Since 1979, Trinity County, California has warmed 2.3°F, with 25 more days above 90°F, about the same number of nights above 70°F and 15% less precipitation a year. Its climate in 1996–2025 is most like Placer County, CA's was in 1951–1980.
- Average temperature: +2.3°F
- Summer highs (Jun–Aug): +5.7°F
- Winter lows (Dec–Feb): +0.7°F
- Precipitation: −15%
- Wettest day of the year: −32%
- Longest dry spell: −1 days
- Days above 90°F: +25 days
- Nights above 70°F: +0 days
- Freezing nights: +2 days
- Frost-free season: −10 days
- Muggy days: +0 days
- Summer heat index (Jun–Aug): +5.4°F
- Extreme fire-weather days: +18 days
- Snowfall: +96%
- Snowy days (1 inch or more): +2 days
Changes follow the trend line through every year from 1979 to 2025. Data: NOAA nClimGrid-Daily; humidity from gridMET, adjusted to airport observations.