Climate change in Monroe County, Illinois
Since 1979, Monroe County, Illinois has warmed 2.9°F, with 3 more days above 90°F, 16 more nights above 70°F and 1% less precipitation a year. Its climate in 1996–2025 is most like Union County, KY's was in 1951–1980.
- Average temperature: +2.9°F
- Summer highs (Jun–Aug): +0.1°F
- Winter lows (Dec–Feb): +4.1°F
- Precipitation: −1%
- Wettest day of the year: +5%
- Longest dry spell: −0 days
- Days above 90°F: +3 days
- Nights above 70°F: +16 days
- Freezing nights: −20 days
- Frost-free season: +22 days
- Muggy days: +12 days
- Summer heat index (Jun–Aug): +1.0°F
- Extreme fire-weather days: +9 days
Changes follow the trend line through every year from 1979 to 2025. Data: NOAA nClimGrid-Daily; humidity from gridMET, adjusted to airport observations.