Carroll County Climate
Carroll County, Iowa
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
48.3°F
Annual Precip
33.7"
Annual Snowfall
—
Extreme Heat Days
18
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
5a
Minimum winter temperature range for plant survival
3,081
Supports most vegetables & fruits
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Carroll County
Climate Verdict
Carroll County has a cool, averaging 48.3°F annually, moderate rainfall of 33.7 inches per year, rare extreme heat with only 18.2 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 19.1°F. summers are warm — July averages 74.1°F. Residents experience a substantial 55°F difference between winter and summer.
Outdoor & Gardening Guidance
Growing season and gardening data is currently limited for Carroll County. Check the USDA Plant Hardiness Zone Map and local extension office for specific guidance.
Regional Context
Carroll County closely matches the Iowa statewide average temperature of 48.0°F, it is somewhat drier than average for Iowa.
Climate Profile
About Carroll County Weather
Warmer than the Iowa Median
Carroll County's 48.3°F annual average temperature is closer to the national median of 53°F than many of its northern neighbors. This reflects a slightly warmer pocket within the state's western interior.
Exceeding the Iowa State Average
The county is slightly warmer than the state average of 48.0°F. However, it remains drier than much of Iowa, recording 33.7 inches of precipitation against the state's 36.1-inch average.
A Warmer Western Neighbor
Carroll is a full degree warmer on average than Calhoun County to its north. While local snowfall data is unavailable, its higher average temperatures suggest a slightly shorter winter season than the state's northern tier.
Hotter Summers and Milder Winters
July temperatures average 74.1°F, and the county faces 18 days of extreme heat above 90°F. Winters are also less severe than northern Iowa, with a January average of 19.1°F.
Focus on Heat Management
With 18 days of extreme heat per year, efficient cooling systems and attic insulation are critical. Residents should still prepare for freezing conditions given the 22.4°F winter 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.