Vermilion County Climate
Vermilion County, Illinois
Avg Annual Temp
52.3°F
Annual Precip
41.6"
Annual Snowfall
19.6"
Extreme Heat Days
20.733333333333334
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Vermilion County Weather
A temperate humid continental climate
Vermilion County records an average annual temperature of 52.3°F, placing it near the national median for temperate regions. The area receives 41.6 inches of precipitation annually, matching the standard profile for the American Midwest.
Matching the Illinois state average
The county's 52.3°F average is nearly identical to the Illinois statewide average of 52.8°F. It ranks as a mid-tier county for temperature, avoiding the harsher northern cold while missing the southern heat.
Warmer than its northern neighbors
Vermilion stays notably warmer than northern peers like Will County, which averages 50.6°F. However, it remains cooler and drier than southern Wabash County, which sees over 48 inches of annual rain.
Balanced seasons with moderate snowfall
Summers bring 21 days of heat at or above 90°F, while winters average a chilly 29.2°F. Residents can expect about 19.6 inches of snow each year, typically falling between December and March.
Prepare for humidity and winter ice
Efficient HVAC systems are vital for the 21 extreme heat days and humid July nights. Homeowners should also maintain snow blowers or shovels to manage the nearly 20 inches of annual snowfall.
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.