Carroll County Climate
Carroll County, Iowa
Avg Annual Temp
48.3°F
Annual Precip
33.7"
Annual Snowfall
—
Extreme Heat Days
18.2
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
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 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.