Climate change in Clarke County, Iowa
Since 1979, Clarke County, Iowa has warmed 2.2°F, with 1 more days above 90°F, 2 more nights above 70°F and 2% more precipitation a year. Its climate in 1996–2025 is most like Van Buren County, IA's was in 1951–1980.
- Average temperature: +2.2°F
- Summer highs (Jun–Aug): +1.1°F
- Winter lows (Dec–Feb): +2.9°F
- Precipitation: +2%
- Wettest day of the year: −8%
- Longest dry spell: −1 days
- Days above 90°F: +1 days
- Nights above 70°F: +2 days
- Freezing nights: −10 days
- Frost-free season: +17 days
- Muggy days: +11 days
- Summer heat index (Jun–Aug): +1.8°F
- Extreme fire-weather days: +11 days
Changes follow the trend line through every year from 1979 to 2025. Data: NOAA nClimGrid-Daily; humidity from gridMET, adjusted to airport observations.