Alexander County Climate
Alexander County, Illinois
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
58.1°F
Annual Precip
51.0"
Annual Snowfall
—
Extreme Heat Days
42
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
7a
Minimum winter temperature range for plant survival
4,539
Excellent for heat-loving crops
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Alexander County
Climate Verdict
Alexander County has a mild, with an average annual temperature of 58.1°F, moderately wet with 51.0 inches of annual precipitation, occasional hot days — 41.7 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 34.7°F. summers are warm — July averages 79.2°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
Alexander County is 5.3°F warmer than the Illinois statewide average of 52.8°F, it is also noticeably wetter, receiving 9.2 inches more precipitation than the state average.
Climate Profile
About Alexander County Weather
Southern Warmth in the Midwest
Alexander County's 58.1°F average temperature is significantly warmer than the national median, reflecting its southern location. The county receives a high 51.0 inches of annual precipitation, placing it among the wetter regions in the country.
One of Illinois' Warmest Spots
At 58.1°F, Alexander County is over 5 degrees warmer than the Illinois state average of 52.8°F. It also exceeds the state average precipitation by nearly 10 inches, recording a lush 51.0 inches annually.
Wetter and Warmer than Neighbors
Alexander is significantly more humid and warm than central counties like Adams, which averages only 52.9°F. Its 42 extreme heat days make it a regional leader in summer intensity.
Intense Heat and Mild Winters
Summers are long and hot, with 42 days hitting 90°F or higher and a July average of 79.2°F. Winters are much milder than the rest of the state, with a January average staying well above freezing at 34.7°F.
Humidity and Heat Management
Prioritize dehumidification and robust HVAC systems to manage the 51.0 inches of rain and 42 days of extreme heat. Residents can worry less about heavy snow, though specific local snowfall records are limited.
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.