Macoupin County Climate
Macoupin County, Illinois
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
54.1°F
Annual Precip
39.4"
Annual Snowfall
16.4"
Extreme Heat Days
26
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
6b
Minimum winter temperature range for plant survival
3,883
Supports most vegetables & fruits
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Macoupin County
Climate Verdict
Macoupin County has a mild, with an average annual temperature of 54.1°F, moderate rainfall of 39.4 inches per year, occasional hot days — 25.799999999999997 per year above 90°F, light snow averaging 16.4 inches per year. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are cold, with January averaging 28.1°F. summers are warm — July averages 76.7°F. The 49°F seasonal variation provides noticeable but manageable change.
Outdoor & Gardening Guidance
Growing season and gardening data is currently limited for Macoupin County. Check the USDA Plant Hardiness Zone Map and local extension office for specific guidance.
Regional Context
Macoupin County closely matches the Illinois statewide average temperature of 52.8°F, it is somewhat drier than average for Illinois.
Climate Profile
About Macoupin County Weather
Warmer and Wetter than Average
Macoupin County's 54.1°F average temperature makes it warmer than the national median. It receives 39.4 inches of rain annually, placing it in the heart of the humid continental zone.
Leaning Toward Illinois' Warmer Side
The county's 54.1°F annual average is over a degree higher than the Illinois state average of 52.8°F. This warming trend is evident in its mild 31.3°F winter average.
Transitioning Toward Southern Illinois
Macoupin acts as a bridge, with 26 extreme heat days—fewer than southern Marion but more than northern Livingston. Its 16.4 inches of snowfall is also a midpoint for the state.
Hot Summers and Soft Winters
July averages a warm 76.7°F, contributing to 26 days per year that exceed 90°F. Winters are relatively mild, with January temperatures averaging 28.1°F.
Manage Humidity and Mid-Range Heat
Residents should prepare for high summer humidity and nearly a month's worth of 90°F days. With 16.4 inches of snow, standard winter gear is necessary but rarely faces northern-style blizzards.
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.