Alexander County Climate
Alexander County, Illinois
Avg Annual Temp
58.1°F
Annual Precip
51.0"
Annual Snowfall
—
Extreme Heat Days
41.7
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
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 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.