Climate change in St. Francois County, Missouri
Since 1979, St. Francois County, Missouri has warmed 2.4°F, with 2 more days above 90°F, 6 more nights above 70°F and 5% more precipitation a year. Its climate in 1996–2025 is most like Union County, IL's was in 1951–1980.
- Average temperature: +2.4°F
- Summer highs (Jun–Aug): −0.0°F
- Winter lows (Dec–Feb): +3.6°F
- Precipitation: +5%
- Wettest day of the year: +9%
- Longest dry spell: −1 days
- Days above 90°F: +2 days
- Nights above 70°F: +6 days
- Freezing nights: −18 days
- Frost-free season: +21 days
- Muggy days: +13 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.