Jackson County Climate
Jackson County, Illinois
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
56.2°F
Annual Precip
45.8"
Annual Snowfall
9.2"
Extreme Heat Days
39
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
7a
Minimum winter temperature range for plant survival
4,136
Excellent for heat-loving crops
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Jackson County
Climate Verdict
Jackson County has a mild, with an average annual temperature of 56.2°F, moderately wet with 45.8 inches of annual precipitation, occasional hot days — 39.4 per year above 90°F, light snow averaging 9.2 inches per year. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are cold, with January averaging 32.8°F. summers are warm — July averages 78.0°F. The 45°F seasonal variation provides noticeable but manageable change.
Outdoor & Gardening Guidance
The moderate temperatures support hiking, cycling, and camping comfortably in spring, summer, and fall.
Regional Context
Jackson County is 3.4°F warmer than the Illinois statewide average of 52.8°F, it is somewhat wetter than average for Illinois.
Climate Profile
About Jackson County Weather
Warmer and wetter than most U.S. counties
Jackson's 56.2°F average is well above the national median, reflecting its southern location. It also receives 45.8 inches of rain, making it a relatively wet region.
A powerhouse of heat in southern Illinois
At 56.2°F, this county is 3.4°F warmer than the Illinois state average of 52.8°F. It is one of the warmest counties in the entire state.
More extreme heat than nearby Jefferson County
Jackson averages 39 extreme heat days, nearly double what Jefferson County experiences. It is also significantly warmer than northern counties like Henry.
Hot, long summers and light winter snow
Summer temperatures average 76.2°F with over five weeks of extreme heat. Snow is infrequent, averaging only 9.2 inches per year.
Budget for cooling and manage heavy rainfall
Air conditioning is a necessity here given the 39 days of extreme heat. Homeowners should also prepare for 45.8 inches of rain with robust drainage systems.
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.