Climate change in Mercer County, Missouri
Since 1979, Mercer County, Missouri has warmed 1.6°F, with 1 fewer days above 90°F, 2 fewer nights above 70°F and about the same precipitation a year. Its climate in 1996–2025 is most like Shelby County, MO's was in 1951–1980.
- Average temperature: +1.6°F
- Summer highs (Jun–Aug): −0.1°F
- Winter lows (Dec–Feb): +2.5°F
- Precipitation: +0%
- Wettest day of the year: +42%
- Longest dry spell: −7 days
- Days above 90°F: −1 days
- Nights above 70°F: −2 days
- Freezing nights: −5 days
- Frost-free season: +5 days
- Muggy days: +10 days
- Summer heat index (Jun–Aug): +0.9°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.