Climate change in Hardin County, Iowa
Since 1979, Hardin County, Iowa has warmed 1.9°F, with 3 fewer days above 90°F, 1 fewer nights above 70°F and 6% more precipitation a year. Its climate in 1996–2025 is most like Iowa County, IA's was in 1951–1980.
- Average temperature: +1.9°F
- Summer highs (Jun–Aug): +0.3°F
- Winter lows (Dec–Feb): +3.1°F
- Precipitation: +6%
- Wettest day of the year: −1%
- Longest dry spell: −1 days
- Days above 90°F: −3 days
- Nights above 70°F: −1 days
- Freezing nights: −8 days
- Frost-free season: +15 days
- Muggy days: +6 days
- Summer heat index (Jun–Aug): +0.8°F
- Extreme fire-weather days: +14 days
- Snowfall: +3%
- Snowy days (1 inch or more): −2 days
Changes follow the trend line through every year from 1979 to 2025. Data: NOAA nClimGrid-Daily; humidity from gridMET, adjusted to airport observations.