Carroll County Climate
Carroll County, Illinois
Avg Annual Temp
48.5°F
Annual Precip
38.9"
Annual Snowfall
33.4"
Extreme Heat Days
19.1
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Carroll County Weather
One of the Nation's Brisk Regions
Carroll County's 48.5°F average temperature is well below the national median. The county features a humid continental climate with 38.9 inches of annual precipitation, slightly drier than many parts of the Midwest.
Illinois' Chilly Northern Border
Ranking as one of the coldest counties in the state, Carroll's 48.5°F average is 4.3 degrees below the Illinois mean. It also records 33.4 inches of snow, which is near the top of the state rankings.
Coldest Among the Regional Group
Carroll is cooler than Bureau County and significantly snowier than the central counties. With 33.4 inches of snow, it faces the most significant winter accumulation of this eight-county group.
Harsh Winters and Brief Summers
The January average is a frigid 20.8°F, and residents manage 33.4 inches of snow. Summers stay cool at 70.9°F on average, though 19 days still climb above 90°F.
Winterize for Severe Cold
Focus on high-grade home insulation and emergency winter vehicle kits to handle the sub-21°F January lows. The 33.4 inches of snow requires professional-grade removal equipment and consistent sidewalk maintenance.
Frequently Asked Questions
What is the average temperature in Carroll County?
How much rain does Carroll County get?
Does it snow in Carroll County?
How hot does Carroll County get in summer?
How cold are winters in Carroll County?
Track your own weather in Carroll County
Ambient Weather personal weather stations give you hyperlocal climate data.
Sponsored
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.