Climate change in Alexander County, Illinois
Since 1979, Alexander County, Illinois has warmed 2.7°F, with 1 more days above 90°F, 14 more nights above 70°F and 5% more precipitation a year. Its climate in 1996–2025 is most like New Madrid County, MO's was in 1951–1980.
- Average temperature: +2.7°F
- Summer highs (Jun–Aug): −0.3°F
- Winter lows (Dec–Feb): +5.2°F
- Precipitation: +5%
- Wettest day of the year: −2%
- Longest dry spell: +4 days
- Days above 90°F: +1 days
- Nights above 70°F: +14 days
- Freezing nights: −23 days
- Frost-free season: +25 days
- Muggy days: +12 days
- Summer heat index (Jun–Aug): +0.5°F
- Extreme fire-weather days: +5 days
Changes follow the trend line through every year from 1979 to 2025. Data: NOAA nClimGrid-Daily; humidity from gridMET, adjusted to airport observations.