Climate change in Gwinnett County, Georgia
Since 1979, Gwinnett County, Georgia has warmed 3.0°F, with 13 more days above 90°F, 21 more nights above 70°F and 4% more precipitation a year. Its climate in 1996–2025 is most like Henry County, GA's was in 1951–1980.
- Average temperature: +3.0°F
- Summer highs (Jun–Aug): +1.4°F
- Winter lows (Dec–Feb): +4.2°F
- Precipitation: +4%
- Wettest day of the year: +16%
- Longest dry spell: +4 days
- Days above 90°F: +13 days
- Nights above 70°F: +21 days
- Freezing nights: −16 days
- Frost-free season: +27 days
- Muggy days: +9 days
- Summer heat index (Jun–Aug): +1.5°F
- Extreme fire-weather days: +11 days
Changes follow the trend line through every year from 1979 to 2025. Data: NOAA nClimGrid-Daily; humidity from gridMET, adjusted to airport observations.