Mills County Climate
Mills County, Iowa
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
50.9°F
Annual Precip
34.8"
Annual Snowfall
21.6"
Extreme Heat Days
34
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
5b
Minimum winter temperature range for plant survival
3,476
Supports most vegetables & fruits
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Mills County
Climate Verdict
Mills County has a mild, with an average annual temperature of 50.9°F, moderate rainfall of 34.8 inches per year, occasional hot days — 34.1 per year above 90°F, moderate snowfall of 21.6 inches annually. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are very cold — January averages 22.6°F. summers are warm — July averages 75.8°F. Residents experience a substantial 53°F difference between winter and summer.
Outdoor & Gardening Guidance
Growing season and gardening data is currently limited for Mills County. Check the USDA Plant Hardiness Zone Map and local extension office for specific guidance.
Regional Context
Mills County closely matches the Iowa statewide average temperature of 48.0°F, the county experiences 18.158754208754214 more extreme heat days than the state average.
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 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.