Henry County Climate
Henry County, Iowa
Avg Annual Temp
49.6°F
Annual Precip
38.8"
Annual Snowfall
25.3"
Extreme Heat Days
19.9
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Henry County Weather
Mild Temperatures in Southeast Iowa
Henry County averages 49.6°F annually, making it one of the warmer spots in the Upper Midwest. While still cooler than the national median, its climate offers a milder profile than much of the surrounding region.
Leading the State in Warmth
At 49.6°F, Henry County stays well above the Iowa state average of 48.0°F. It is also wetter than average, receiving 38.8 inches of precipitation compared to the state benchmark of 36.1 inches.
Warmest Among Local Peers
Henry County is noticeably warmer than Iowa County to its north, which averages 48.2°F. It also sees less snow than its northern neighbors, recording only 25.3 inches annually.
Hot Summers and Manageable Winters
The county experiences 20 days per year above 90°F, with a summer average of 71.6°F. Winters are among the state's mildest, with a January average of 22.0°F and relatively low snowfall of 25.3 inches.
Plan for Humidity and Rain
High annual precipitation of 38.8 inches makes moisture control and basement waterproofing a priority for homeowners. While winter is milder than elsewhere in Iowa, reliable HVAC systems are needed to manage the 20 days of extreme summer heat.
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.