Harrison County Climate
Harrison County, Iowa
Avg Annual Temp
48.6°F
Annual Precip
37.1"
Annual Snowfall
37.1"
Extreme Heat Days
24.95
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Harrison County Weather
Western Iowa’s Warm and Wet Climate
Harrison County averages 48.6°F annually, keeping it warmer than many of its northern peers but still below the national median. Its humid continental climate is characterized by significant precipitation, totaling 37.1 inches per year.
Above the Iowa Temperature Baseline
Harrison is warmer and wetter than the average Iowa county, exceeding the state’s 48.0°F temperature and 36.1-inch precipitation marks. This makes it one of the more productive but humid agricultural zones in the region.
Hotter Than Central Neighbors
Compared to Ida County at 47.1°F, Harrison is significantly warmer and faces nearly double the number of extreme heat days. Its 25 days above 90°F set it apart from the cooler counties found further east and north.
Intense Summer Heat and Heavy Snow
July brings a warm average of 74.3°F and 25 days of extreme heat reaching at least 90°F. Despite the summer warmth, winters remain snowy with 37.1 inches of annual snowfall and a January average of 19.7°F.
Engineered for Extreme Peaks
Robust cooling systems are essential here given the high frequency of 90°F days. Residents must also maintain heavy-duty snow equipment to manage the 37.1 inches of annual accumulation that arrives during the winter months.
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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.