Mahaska County Climate
Mahaska County, Iowa
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
50.1°F
Annual Precip
38.7"
Annual Snowfall
—
Extreme Heat Days
15
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
5b
Minimum winter temperature range for plant survival
3,296
Supports most vegetables & fruits
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Mahaska County
Climate Verdict
Mahaska County has a mild, with an average annual temperature of 50.1°F, moderate rainfall of 38.7 inches per year, rare extreme heat with only 15.4 days above 90°F annually. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are very cold — January averages 21.5°F. summers are warm — July averages 75.2°F. Residents experience a substantial 54°F difference between winter and summer.
Outdoor & Gardening Guidance
Growing season and gardening data is currently limited for Mahaska County. Check the USDA Plant Hardiness Zone Map and local extension office for specific guidance.
Regional Context
Mahaska County closely matches the Iowa statewide average temperature of 48.0°F, it is somewhat wetter than average for Iowa.
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 sources: NOAA National Centers for Environmental Information (NCEI), U.S. Climate Normals 1991-2020. Forecast and alert data from National Weather Service API. Air quality data from Open-Meteo.
Climate normals are 30-year averages of weather variables. Station data is aggregated to county level. Forecasts and alerts are fetched live and may change frequently. Data is informational only — not a substitute for official National Weather Service forecasts or emergency weather warnings.