Vermilion County Climate
Vermilion County, Illinois
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
52.3°F
Annual Precip
41.6"
Annual Snowfall
19.6"
Extreme Heat Days
21
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
6a
Minimum winter temperature range for plant survival
3,527
Supports most vegetables & fruits
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Vermilion County
Climate Verdict
Vermilion County has a mild, with an average annual temperature of 52.3°F, moderately wet with 41.6 inches of annual precipitation, occasional hot days — 20.733333333333334 per year above 90°F, light snow averaging 19.6 inches per year. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are cold, with January averaging 26.1°F. summers are warm — July averages 74.6°F. The 49°F seasonal variation provides noticeable but manageable change.
Outdoor & Gardening Guidance
Growing season and gardening data is currently limited for Vermilion County. Check the USDA Plant Hardiness Zone Map and local extension office for specific guidance.
Regional Context
Vermilion County closely matches the Illinois statewide average temperature of 52.8°F.
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 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.