Henderson County Climate
Henderson County, Illinois
Avg Annual Temp
51.9°F
Annual Precip
37.2"
Annual Snowfall
16.9"
Extreme Heat Days
20.6
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Henderson County Weather
A typical continental climate near national medians
At 51.9°F, Henderson County is just slightly cooler than the national median of 53°F. This area experiences the full range of four distinct seasons.
Slightly cooler than the average Illinois county
The annual temperature of 51.9°F trails the Illinois state average of 52.8°F by almost a full degree. This cooler profile is typical for the northwestern part of the state.
One of the drier counties in the region
Henderson's 37.2 inches of annual precipitation is well below the state average of 41.7 inches. It is notably drier than nearby Hancock County to the south.
Cold winters and three weeks of extreme heat
The county sees 21 extreme heat days annually and averages 16.9 inches of snow. January is cold, with an average temperature of just 24.0°F.
Prepare for cold snaps and moderate snowfall
Keep snow removal tools ready for the 16.9-inch annual average. Home insulation should be rated for the 24.0°F January lows and 76.2°F July highs.
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.