Climate change in Polk County, Iowa
Since 1979, Polk County, Iowa has warmed 1.8°F, with 2 fewer days above 90°F, 1 more nights above 70°F and 5% more precipitation a year. Its climate in 1996–2025 is most like Van Buren County, IA's was in 1951–1980.
- Average temperature: +1.8°F
- Summer highs (Jun–Aug): +0.3°F
- Winter lows (Dec–Feb): +3.0°F
- Precipitation: +5%
- Wettest day of the year: +2%
- Longest dry spell: −0 days
- Days above 90°F: −2 days
- Nights above 70°F: +1 days
- Freezing nights: −10 days
- Frost-free season: +8 days
- Muggy days: +6 days
- Summer heat index (Jun–Aug): +0.6°F
- Extreme fire-weather days: +11 days
- Snowfall: +19%
- 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.