Scott County Climate
Scott County, Illinois
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
52.9°F
Annual Precip
40.4"
Annual Snowfall
—
Extreme Heat Days
34
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
6a
Minimum winter temperature range for plant survival
3,673
Supports most vegetables & fruits
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Scott County
Climate Verdict
Scott County has a mild, with an average annual temperature of 52.9°F, moderately wet with 40.4 inches of annual precipitation, occasional hot days — 34.1 per year above 90°F. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are cold, with January averaging 26.7°F. summers are warm — July averages 76.0°F. The 49°F seasonal variation provides noticeable but manageable change.
Outdoor & Gardening Guidance
Growing season and gardening data is currently limited for Scott County. Check the USDA Plant Hardiness Zone Map and local extension office for specific guidance.
Regional Context
Scott County closely matches the Illinois statewide average temperature of 52.8°F.
Climate Profile
About Scott County Weather
Mirroring the National Climate
Scott County averages 52.9°F annually, sitting almost exactly at the national median. The region experiences a balanced humid continental climate with distinct seasonal changes.
Typical Illinois Temperatures
At 52.9°F, the county aligns perfectly with the Illinois state average of 52.8°F. It represents the quintessential climate profile for the heart of the Prairie State.
More Heat Than Northern Neighbors
Scott County averages 34 extreme heat days, significantly more than Schuyler's 21 days. This makes it one of the hotter localized pockets in the immediate western region.
Intense Summer Heat Waves
July averages a warm 76.0°F, fueling over a month's worth of days above 90°F. While snowfall records are not available, winters stay cold with a December-February average of 30.0°F.
Focus on Cooling Capacity
High-efficiency air conditioning is critical here due to the 34 days of extreme heat. Summer outdoor activities should be planned for early morning to avoid the frequent 90-degree spikes.
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.