Jo Daviess County Climate
Jo Daviess County, Illinois
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
47.4°F
Annual Precip
39.2"
Annual Snowfall
34.6"
Extreme Heat Days
8
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
5a
Minimum winter temperature range for plant survival
2,770
Supports most vegetables & fruits
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Jo Daviess County
Climate Verdict
Jo Daviess County has a cool, averaging 47.4°F annually, moderate rainfall of 39.2 inches per year, rare extreme heat with only 8.266666666666666 days above 90°F annually, moderate snowfall of 34.6 inches annually. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are very cold — January averages 19.2°F. summers are warm — July averages 71.9°F. Residents experience a substantial 53°F difference between winter and summer.
Outdoor & Gardening Guidance
Growing season and gardening data is currently limited for Jo Daviess County. Check the USDA Plant Hardiness Zone Map and local extension office for specific guidance.
Regional Context
Jo Daviess County is 5.4°F cooler than the Illinois statewide average of 52.8°F, it is somewhat drier than average for Illinois, the county experiences 18.994365530303032 fewer extreme heat days than the state average.
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 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.