Adams County Climate
Adams County, Illinois
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
52.9°F
Annual Precip
37.2"
Annual Snowfall
17.0"
Extreme Heat Days
26
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
6a
Minimum winter temperature range for plant survival
3,697
Supports most vegetables & fruits
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Adams County
Climate Verdict
Adams County has a mild, with an average annual temperature of 52.9°F, moderate rainfall of 37.2 inches per year, occasional hot days — 26.433333333333334 per year above 90°F, light snow averaging 17.0 inches per year. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are cold, with January averaging 26.2°F. summers are warm — July averages 76.4°F. Residents experience a substantial 50°F difference between winter and summer.
Outdoor & Gardening Guidance
Growing season and gardening data is currently limited for Adams County. Check the USDA Plant Hardiness Zone Map and local extension office for specific guidance.
Regional Context
Adams County closely matches the Illinois statewide average temperature of 52.8°F, it is somewhat drier than average for Illinois.
Climate Profile
About Adams County Weather
Adams County's Middle-of-the-Road Climate
Adams County averages 52.9°F annually, aligning almost perfectly with the national median for a humid continental climate. The region experiences 37.2 inches of precipitation, providing a consistent water supply throughout the year.
Right at the Illinois Average
With an annual temperature of 52.9°F, Adams sits right at the Illinois state average of 52.8°F. It serves as a representative sample of the state's central weather patterns, though it is slightly drier than the state average of 41.7 inches of rain.
Drier Winters than Northern Neighbors
Adams receives 17.0 inches of snow, which is significantly less than the 30-plus inches seen in northern Illinois counties. Its 52.9°F average temperature makes it warmer than Bureau County but cooler than the state's southern tip.
Hot Summers and Moderate Snow
Summer heat is a major factor here, with 26 days reaching 90°F or higher and a July average of 76.4°F. Winter brings a colder turn with a 26.2°F January average and 17.0 inches of annual snowfall.
Prepare for Summer Humidity Peaks
Invest in high-efficiency cooling systems to handle the 26 annual extreme heat days. Keep moderate snow removal tools ready for the 17.0 inches of winter accumulation that typically occurs between December and March.
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.