Coles County Climate
Coles County, Illinois
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
54.0°F
Annual Precip
40.3"
Annual Snowfall
16.8"
Extreme Heat Days
25
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
6a
Minimum winter temperature range for plant survival
3,849
Supports most vegetables & fruits
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Coles County
Climate Verdict
Coles County has a mild, with an average annual temperature of 54.0°F, moderately wet with 40.3 inches of annual precipitation, occasional hot days — 25.366666666666664 per year above 90°F, light snow averaging 16.8 inches per year. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are cold, with January averaging 28.2°F. summers are warm — July averages 76.4°F. The 48°F seasonal variation provides noticeable but manageable change.
Outdoor & Gardening Guidance
Growing season and gardening data is currently limited for Coles County. Check the USDA Plant Hardiness Zone Map and local extension office for specific guidance.
Regional Context
Coles County closely matches the Illinois statewide average temperature of 52.8°F.
Climate Profile
About Coles County Weather
Perfectly aligned with national temperature medians
Coles County averages 54.0°F annually, aligning perfectly with the national median for temperature. Its 40.3 inches of precipitation is slightly lower than the surrounding Illinois average but typical for the Midwest.
Warmer than the average Illinois county
The county stays warmer than the Illinois average of 52.8°F by over a degree. This places it firmly in the transition zone between the cooler northern plains and the warmer southern tip of the state.
Warmer summers and less snow than Champaign
Coles is warmer than Champaign County to the north, experiencing 25 extreme heat days compared to Champaign's 21. It also sees less snow, averaging 16.8 inches compared to its neighbor's 20.9 inches.
Reliable seasonal shifts with moderate extremes
Summers are warm with 25 days reaching 90°F and a July average of 76.4°F. January averages 28.2°F, providing a clear but not overly harsh winter season with moderate snowfall.
Maintain a balanced year-round climate plan
A mix of summer and winter gear is needed to handle the 25 heat days and nearly 17 inches of snow. Homeowners should plan for a balanced utility budget to cover both heating and cooling seasons.
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.