Climate change in Adams County, Illinois
Since 1979, Adams County, Illinois has warmed 2.0°F, with 3 fewer days above 90°F, 2 more nights above 70°F and 4% less precipitation a year. Its climate in 1996–2025 is most like Montgomery County, IL's was in 1951–1980.
- Average temperature: +2.0°F
- Summer highs (Jun–Aug): −0.6°F
- Winter lows (Dec–Feb): +3.7°F
- Precipitation: −4%
- Wettest day of the year: +4%
- Longest dry spell: −5 days
- Days above 90°F: −3 days
- Nights above 70°F: +2 days
- Freezing nights: −14 days
- Frost-free season: +7 days
- Muggy days: +2 days
- Summer heat index (Jun–Aug): −0.4°F
- Extreme fire-weather days: +8 days
- Snowfall: +32%
- Snowy days (1 inch or more): +0 days
Changes follow the trend line through every year from 1979 to 2025. Data: NOAA nClimGrid-Daily; humidity from gridMET, adjusted to airport observations.