Henry County Climate
Henry County, Illinois
Avg Annual Temp
50.0°F
Annual Precip
38.7"
Annual Snowfall
28.7"
Extreme Heat Days
16.23333333333333
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
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
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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.