Sangamon County Climate
Sangamon County, Illinois
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
53.5°F
Annual Precip
39.1"
Annual Snowfall
21.2"
Extreme Heat Days
26
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
6a
Minimum winter temperature range for plant survival
3,741
Supports most vegetables & fruits
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Sangamon County
Climate Verdict
Sangamon County has a mild, with an average annual temperature of 53.5°F, moderate rainfall of 39.1 inches per year, occasional hot days — 25.7 per year above 90°F, moderate snowfall of 21.2 inches annually. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are cold, with January averaging 27.5°F. summers are warm — July averages 76.1°F. The 49°F seasonal variation provides noticeable but manageable change.
Outdoor & Gardening Guidance
Growing season and gardening data is currently limited for Sangamon County. Check the USDA Plant Hardiness Zone Map and local extension office for specific guidance.
Regional Context
Sangamon County closely matches the Illinois statewide average temperature of 52.8°F, it is somewhat drier than average for Illinois.
Climate Profile
About Sangamon County Weather
Warmer Than the National Average
Sangamon County maintains an annual average temperature of 53.5°F, placing it above the national median of 52.7°F. The local climate is characterized by moderate humidity and typical Midwestern seasonal shifts.
A Warm Spot in Central Illinois
The county's 53.5°F average exceeds the Illinois state average of 52.8°F. As the home of the state capital, it represents one of the warmer hubs in the central region of the state.
Outpacing the Neighbors in Heat
Sangamon is notably warmer than its western neighbor Schuyler County, which averages 51.7°F. It remains closely aligned with Shelby County's 53.3°F average to the southeast.
Hot Summers and Snowy Winters
Residents face 26 days of extreme heat above 90°F annually, particularly during July's 76.1°F average peak. Winter brings 21.2 inches of snow as temperatures drop to a January average of 27.5°F.
Prepare for Seasonal Extremes
Homeowners should prioritize efficient HVAC systems to manage the nearly month-long stretch of 90-degree days. Winter gear remains essential to handle the 21 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.