Mahaska County Climate
Mahaska County, Iowa
Avg Annual Temp
50.1°F
Annual Precip
38.7"
Annual Snowfall
—
Extreme Heat Days
15.4
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Mahaska County Weather
One of Iowa's warmer regions
Mahaska County's annual average of 50.1°F is higher than many other Iowa counties, though still below the national median. This climate supports a long growing season with ample summer warmth.
Surpassing the state warmth average
At 50.1°F, Mahaska is significantly warmer than the Iowa state average of 48.0°F. It is also wetter than the state average, receiving 38.7 inches of annual precipitation.
The warm spot of the region
Mahaska is warmer than neighboring Madison and Lucas counties, exceeding their averages by roughly 2 degrees. It matches Madison's heat frequency with 15 days over 90°F per year.
Hot summers and moist air
July is quite warm here, averaging 75.2°F with frequent humidity. While annual snowfall data is currently unavailable, winter temperatures remain chilly with a December-February average of 24.9°F.
Focus on cooling and moisture
With 38.7 inches of precipitation and high July temperatures, moisture control and air conditioning are priorities. Residents should plan for a January average of 21.5°F when maintaining home heating.
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.