Scott County Climate
Scott County, Illinois
Avg Annual Temp
52.9°F
Annual Precip
40.4"
Annual Snowfall
—
Extreme Heat Days
34.1
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
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 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.