Climate change in Hancock County, Iowa
Since 1979, Hancock County, Iowa has warmed 1.9°F, with 4 fewer days above 90°F, about the same number of nights above 70°F and 3% more precipitation a year. Its climate in 1996–2025 is most like Grundy County, IA's was in 1951–1980.
- Average temperature: +1.9°F
- Summer highs (Jun–Aug): +0.4°F
- Winter lows (Dec–Feb): +3.4°F
- Precipitation: +3%
- Wettest day of the year: −18%
- Longest dry spell: −2 days
- Days above 90°F: −4 days
- Nights above 70°F: −0 days
- Freezing nights: −10 days
- Frost-free season: +16 days
- Muggy days: +6 days
- Summer heat index (Jun–Aug): +0.9°F
- Extreme fire-weather days: +16 days
- Snowfall: +14%
- Snowy days (1 inch or more): −4 days
Changes follow the trend line through every year from 1979 to 2025. Data: NOAA nClimGrid-Daily; humidity from gridMET, adjusted to airport observations.