Saline County Climate
Saline County, Illinois
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
57.3°F
Annual Precip
47.6"
Annual Snowfall
—
Extreme Heat Days
43
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
7a
Minimum winter temperature range for plant survival
4,395
Excellent for heat-loving crops
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Saline County
Climate Verdict
Saline County has a mild, with an average annual temperature of 57.3°F, moderately wet with 47.6 inches of annual precipitation, occasional hot days — 43.3 per year above 90°F. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are cold, with January averaging 33.4°F. summers are warm — July averages 78.7°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
Saline County is 4.5°F warmer than the Illinois statewide average of 52.8°F, it is also noticeably wetter, receiving 5.8 inches more precipitation than the state average, the county experiences 16.0389678030303 more extreme heat days than the state average.
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 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.