Climate change in San Diego County, California
Since 1979, San Diego County, California has warmed 2.2°F, with 29 more days above 90°F, 6 more nights above 70°F and 27% less precipitation a year.
- Average temperature: +2.2°F
- Summer highs (Jun–Aug): +2.8°F
- Winter lows (Dec–Feb): +1.3°F
- Precipitation: −27%
- Wettest day of the year: −17%
- Longest dry spell: +19 days
- Days above 90°F: +29 days
- Nights above 70°F: +6 days
- Freezing nights: −2 days
- Frost-free season: −8 days
- Muggy days: −1 days
- Summer heat index (Jun–Aug): +3.1°F
- Extreme fire-weather days: +27 days
Changes follow the trend line through every year from 1979 to 2025. Data: NOAA nClimGrid-Daily; humidity from gridMET, adjusted to airport observations.