Adams County Climate
Adams County, Illinois
Avg Annual Temp
52.9°F
Annual Precip
37.2"
Annual Snowfall
17.0"
Extreme Heat Days
26.433333333333337
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
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 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.