Harrison County Climate
Harrison County, Iowa
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
48.6°F
Annual Precip
37.1"
Annual Snowfall
37.1"
Extreme Heat Days
25
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
5b
Minimum winter temperature range for plant survival
3,139
Supports most vegetables & fruits
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Harrison County
Climate Verdict
Harrison County has a cool, averaging 48.6°F annually, moderate rainfall of 37.1 inches per year, occasional hot days — 24.95 per year above 90°F, moderate snowfall of 37.1 inches annually. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are very cold — January averages 19.7°F. summers are warm — July averages 74.3°F. Residents experience a substantial 55°F difference between winter and summer.
Outdoor & Gardening Guidance
Growing season and gardening data is currently limited for Harrison County. Check the USDA Plant Hardiness Zone Map and local extension office for specific guidance.
Regional Context
Harrison County closely matches the Iowa statewide average temperature of 48.0°F.
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.
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.