Climate change in Lassen County, California
Since 1979, Lassen County, California has warmed 2.2°F, with 13 more days above 90°F, about the same number of nights above 70°F and 13% less precipitation a year. Its climate in 1996–2025 is most like Douglas County, NV's was in 1951–1980.
- Average temperature: +2.2°F
- Summer highs (Jun–Aug): +4.1°F
- Winter lows (Dec–Feb): +1.3°F
- Precipitation: −13%
- Wettest day of the year: −8%
- Longest dry spell: +20 days
- Days above 90°F: +13 days
- Nights above 70°F: +0 days
- Freezing nights: −7 days
- Frost-free season: +0 days
- Muggy days: +0 days
- Summer heat index (Jun–Aug): +3.5°F
- Extreme fire-weather days: +17 days
Changes follow the trend line through every year from 1979 to 2025. Data: NOAA nClimGrid-Daily; humidity from gridMET, adjusted to airport observations.