Jo Daviess County Climate
Jo Daviess County, Illinois
Avg Annual Temp
47.4°F
Annual Precip
39.2"
Annual Snowfall
34.6"
Extreme Heat Days
8.266666666666666
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Jo Daviess County Weather
A cool northern continental climate
With an average annual temperature of 47.4°F, Jo Daviess is significantly cooler than the national median. This region experiences a true four-season climate defined by brisk air and heavy winter accumulation.
Among the coldest counties in Illinois
The county's 47.4°F average is over five degrees colder than the Illinois state average of 52.8°F. It sits near the bottom of the state temperature rankings, emphasizing its northern latitude.
Coldest in the regional comparison
Jo Daviess is much colder than Kane County, which averages 49.5°F. It also records 34.6 inches of snow, far surpassing the 12.5 inches seen in Jersey County to the south.
Heavy snow and mild summers
Winter is rigorous here, with temperatures averaging just 22.6°F and delivering 34.6 inches of snow. Conversely, summers are comfortable, featuring only 8 days of extreme heat above 90°F.
Prepare for significant winter weather
High-quality snow removal equipment and heavy-duty winter apparel are essential for the 34.6-inch annual snowfall. Homeowners can focus more on heating efficiency than extreme summer cooling.
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.