Saline County Climate
Saline County, Illinois
Avg Annual Temp
57.3°F
Annual Precip
47.6"
Annual Snowfall
—
Extreme Heat Days
43.3
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Saline County Weather
A Warm Southern Illinois Climate
Saline County averages 57.3°F annually, placing it among the warmer counties in the nation. It enjoys a climate that transitions toward humid subtropical, with long, hot summers.
Exceeding the State Thermal Average
The county is much warmer than the 52.8°F Illinois average, clocking in at 57.3°F. It is also wetter than the state average, recording 47.6 inches of precipitation annually.
Southern Heat and High Humidity
Saline matches the heat profile of neighbor Pope County with 43 days of temperatures over 90°F. Its 78.7°F July average is consistent with the warmest regions in southern Illinois.
Intense Summer Heat Peaks
July is very hot with an average of 78.7°F and 43 days of extreme heat. Winters are mild for the Midwest, with January temperatures averaging 33.4°F, though annual snowfall data is currently unavailable.
Focus on Summer Cooling
The 43 days of extreme heat make high-efficiency air conditioning a critical necessity for residents. With 47.6 inches of rain, keeping gutters clear and basements dry is a year-round task.
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.