Marion County Climate
Marion County, Iowa
Avg Annual Temp
49.9°F
Annual Precip
36.9"
Annual Snowfall
—
Extreme Heat Days
20.1
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Marion County Weather
A warm pocket in the Midwest
Marion County averages 49.9°F annually, which is on the higher end for Iowa but remains below the national median. The area experiences a robust humid continental climate with frequent summer heatwaves.
Leading the state in heat
Marion's 49.9°F average is nearly two degrees higher than the Iowa state average. It also sees 20 days of extreme heat annually, which is significantly higher than many northern counties.
More extreme heat than neighbors
Marion records 20 days above 90°F, surpassing neighbors like Mahaska and Madison. While its temperature is high, its 36.9 inches of rain is very close to the state average.
Intense summers and cold winters
Summer is a major factor here, with a July average of 75.1°F. Although specific snowfall totals are currently unlisted, winter temperatures average 24.8°F, providing a sharp contrast to the summer heat.
Prioritize high-efficiency cooling
With 20 days of extreme heat, a robust cooling system is essential for resident safety and comfort. Homeowners should also prepare for a 21.2°F January, the coldest month of the year.
Frequently Asked Questions
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Data source: NOAA National Centers for Environmental Information (NCEI), U.S. Climate Normals 1991-2020.
Climate normals are 30-year averages of weather variables computed from 1991 to 2020. Station data is aggregated to county level using spatial averaging. Data is informational only — not a substitute for official National Weather Service forecasts or emergency weather warnings.