Climate change in Marion County, Iowa
Since 1979, Marion County, Iowa has warmed 1.6°F, with 2 fewer days above 90°F, 1 fewer 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: +1.6°F
- Summer highs (Jun–Aug): +0.1°F
- Winter lows (Dec–Feb): +2.2°F
- Precipitation: +2%
- Wettest day of the year: +9%
- Longest dry spell: −2 days
- Days above 90°F: −2 days
- Nights above 70°F: −1 days
- Freezing nights: −5 days
- Frost-free season: +5 days
- Muggy days: +7 days
- Summer heat index (Jun–Aug): +0.5°F
- Extreme fire-weather days: +11 days
- Snowfall: −28%
- Snowy days (1 inch or more): −6 days
Changes follow the trend line through every year from 1979 to 2025. Data: NOAA nClimGrid-Daily; humidity from gridMET, adjusted to airport observations.