Henry County Climate
Henry County, Iowa
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
49.6°F
Annual Precip
38.8"
Annual Snowfall
25.3"
Extreme Heat Days
20
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
5b
Minimum winter temperature range for plant survival
3,118
Supports most vegetables & fruits
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Henry County
Climate Verdict
Henry County has a cool, averaging 49.6°F annually, moderate rainfall of 38.8 inches per year, rare extreme heat with only 19.9 days above 90°F annually, moderate snowfall of 25.3 inches annually. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are very cold — January averages 22.0°F. summers are warm — July averages 73.5°F. Residents experience a substantial 52°F difference between winter and summer.
Outdoor & Gardening Guidance
Growing season and gardening data is currently limited for Henry County. Check the USDA Plant Hardiness Zone Map and local extension office for specific guidance.
Regional Context
Henry County closely matches the Iowa statewide average temperature of 48.0°F, it is somewhat wetter than average for Iowa.
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 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.