Climate change in Sioux County, Iowa
Since 1979, Sioux County, Iowa has warmed 2.0°F, with 4 fewer days above 90°F, about the same number of nights above 70°F and 7% more precipitation a year. Its climate in 1996–2025 is most like Story County, IA's was in 1951–1980.
- Average temperature: +2.0°F
- Summer highs (Jun–Aug): +0.5°F
- Winter lows (Dec–Feb): +3.6°F
- Precipitation: +7%
- Wettest day of the year: +22%
- Longest dry spell: +1 days
- Days above 90°F: −4 days
- Nights above 70°F: +0 days
- Freezing nights: −12 days
- Frost-free season: +16 days
- Muggy days: +10 days
- Summer heat index (Jun–Aug): +0.9°F
- Extreme fire-weather days: +14 days
- Snowfall: −29%
- 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.