Mills County Climate
Mills County, Iowa
Avg Annual Temp
50.9°F
Annual Precip
34.8"
Annual Snowfall
21.6"
Extreme Heat Days
34.1
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Mills County Weather
A Warm Slice of the Midwest
Mills County averages 50.9°F annually, which is cooler than the national median but high for the region. It maintains a humid continental climate with 34.8 inches of annual precipitation.
Warmer Than the Iowa Average
The county sits 2.9 degrees above the Iowa state average of 48.0°F. This makes it one of the warmer regions in the state, particularly compared to northern counties.
Regional Warmth on the Border
Mills matches the 50.8°F average of neighboring Montgomery County but is significantly warmer than Monona to the north. It experiences a similar precipitation profile to its southern Iowa neighbors.
Hot Summers and Manageable Snow
Summer brings 34 days of extreme heat over 90°F, while winter is defined by 21.6 inches of snowfall. The temperature range spans from a 22.6°F January to a 75.8°F July.
Prepare for the Summer Surge
Residents should prioritize high-efficiency cooling to handle the month-plus of extreme heat days. Winter gear requirements are moderate, as the 21.6 inches of snow is lower than the northern state average.
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.