Greene County Climate
Greene County, Illinois
Avg Annual Temp
52.9°F
Annual Precip
40.3"
Annual Snowfall
17.9"
Extreme Heat Days
24.7
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Greene County Weather
Typical Mid-American Climate
Greene County’s 52.9°F annual average temperature aligns perfectly with the national median. It offers a balanced climate typical of the American heartland.
Mirroring the Illinois Average
The county's 52.9°F average temperature is nearly identical to the Illinois state average of 52.8°F. It serves as a climate bellwether for the entire state.
Drier Than Southern Neighbors
Receiving 40.3 inches of annual precipitation, Greene is slightly drier than the Illinois average of 41.7 inches. This makes it a transition point between the wet south and drier north.
Steady Heat and Moderate Snow
The county sees 25 extreme heat days annually where temperatures hit 90°F. Winters bring a manageable 17.9 inches of snow, with January averages staying around 26.9°F.
Prepare for Seasonal Extremes
A dual-purpose HVAC system is necessary to handle both the 25 heat days and the sub-freezing winter nights. Keep snow removal tools ready for the nearly 18 inches of expected snowfall.
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.