Climate change in San Joaquin County, California
Since 1979, San Joaquin County, California has warmed 2.6°F, with 31 more days above 90°F, 2 more nights above 70°F and 16% less precipitation a year. Its climate in 1996–2025 is most like Sutter County, CA's was in 1951–1980.
- Average temperature: +2.6°F
- Summer highs (Jun–Aug): +4.5°F
- Winter lows (Dec–Feb): +1.4°F
- Precipitation: −16%
- Wettest day of the year: +6%
- Longest dry spell: +15 days
- Days above 90°F: +31 days
- Nights above 70°F: +2 days
- Freezing nights: −8 days
- Frost-free season: +2 days
- Muggy days: −0 days
- Summer heat index (Jun–Aug): +3.8°F
- Extreme fire-weather days: +37 days
Changes follow the trend line through every year from 1979 to 2025. Data: NOAA nClimGrid-Daily; humidity from gridMET, adjusted to airport observations.