Climate change in San Bernardino County, California
Since 1979, San Bernardino County, California has warmed 2.4°F, with 14 more days above 90°F, 27 more nights above 70°F and 33% less precipitation a year.
- Average temperature: +2.4°F
- Summer highs (Jun–Aug): +3.7°F
- Winter lows (Dec–Feb): +0.8°F
- Precipitation: −33%
- Wettest day of the year: −19%
- Longest dry spell: −5 days
- Days above 90°F: +14 days
- Nights above 70°F: +27 days
- Freezing nights: −1 days
- Frost-free season: +3 days
- Muggy days: −0 days
- Summer heat index (Jun–Aug): +2.5°F
- Extreme fire-weather days: +23 days
Changes follow the trend line through every year from 1979 to 2025. Data: NOAA nClimGrid-Daily; humidity from gridMET, adjusted to airport observations.