Jackson County Climate
Jackson County, Illinois
Avg Annual Temp
56.2°F
Annual Precip
45.8"
Annual Snowfall
9.2"
Extreme Heat Days
39.4
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
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 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.