Climate change in Calhoun County, Iowa
Since 1979, Calhoun County, Iowa has warmed 2.1°F, with 7 fewer days above 90°F, 2 more nights above 70°F and 5% less precipitation a year. Its climate in 1996–2025 is most like Jasper County, IA's was in 1951–1980.
- Average temperature: +2.1°F
- Summer highs (Jun–Aug): −0.6°F
- Winter lows (Dec–Feb): +3.0°F
- Precipitation: −5%
- Wettest day of the year: −14%
- Longest dry spell: +2 days
- Days above 90°F: −7 days
- Nights above 70°F: +2 days
- Freezing nights: −17 days
- Frost-free season: +21 days
- Muggy days: +8 days
- Summer heat index (Jun–Aug): −0.7°F
- Extreme fire-weather days: +16 days
- Snowfall: −9%
- Snowy days (1 inch or more): −1 days
Changes follow the trend line through every year from 1979 to 2025. Data: NOAA nClimGrid-Daily; humidity from gridMET, adjusted to airport observations.