Henry County Climate
Henry County, Illinois
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
50.0°F
Annual Precip
38.7"
Annual Snowfall
28.7"
Extreme Heat Days
16
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
5b
Minimum winter temperature range for plant survival
3,222
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 mild, with an average annual temperature of 50.0°F, moderate rainfall of 38.7 inches per year, rare extreme heat with only 16.23333333333333 days above 90°F annually, moderate snowfall of 28.7 inches annually. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are very cold — January averages 22.1°F. summers are warm — July averages 74.2°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 Illinois statewide average temperature of 52.8°F, it is somewhat drier than average for Illinois.
Climate Profile
About Henry County Weather
Significantly cooler than the national median
Henry County's 50.0°F average temperature is much lower than the national median of 53°F. It represents a colder northern humid continental climate.
Among the coldest counties in Illinois
The average temperature of 50.0°F is 2.8°F lower than the state average of 52.8°F. This makes Henry one of the chillier regions in the Land of Lincoln.
A regional leader in annual snowfall
Henry receives 28.7 inches of snow, which is significantly more than neighbors like Iroquois. Its 38.7 inches of total precipitation is also below the state average.
Harsh winters and mild, manageable summers
Winter temperatures average a frigid 25.4°F, contributing to the high snow totals. Summer is relatively comfortable with only 16 days of extreme heat.
Invest in heavy-duty winter gear and heating
Residents should prioritize high-quality snow blowers for the 28.7-inch snow season. Home heating systems are the primary utility concern given the 22.1°F January average.
Frequently Asked Questions
What is the average temperature in Henry County?
How much rain does Henry County get?
Does it snow in Henry County?
How hot does Henry County get in summer?
How cold are winters in Henry County?
Track your own weather in Henry County
Ambient Weather personal weather stations give you hyperlocal climate data.
Sponsored
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.