Whiteside County Climate
Whiteside County, Illinois
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
49.1°F
Annual Precip
37.9"
Annual Snowfall
30.0"
Extreme Heat Days
15
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
5b
Minimum winter temperature range for plant survival
3,060
Supports most vegetables & fruits
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Whiteside County
Climate Verdict
Whiteside County has a cool, averaging 49.1°F annually, moderate rainfall of 37.9 inches per year, rare extreme heat with only 15.25 days above 90°F annually, moderate snowfall of 30.0 inches annually. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are very cold — January averages 20.9°F. summers are warm — July averages 73.5°F. Residents experience a substantial 53°F difference between winter and summer.
Outdoor & Gardening Guidance
Growing season and gardening data is currently limited for Whiteside County. Check the USDA Plant Hardiness Zone Map and local extension office for specific guidance.
Regional Context
Whiteside County is 3.7°F cooler than the Illinois statewide average of 52.8°F, it is somewhat drier than average for Illinois.
Climate Profile
About Whiteside County Weather
A true northern continental climate
Whiteside County averages 49.1°F, which is notably cooler than the national median. It is drier than many peers, with 37.9 inches of annual precipitation.
Among the coldest in Illinois
At 49.1°F, Whiteside is much colder than the state average of 52.8°F. It ranks as one of the northernmost and coldest counties in Illinois, with harsh winter conditions.
Highest snowfall in the area
With 30 inches of annual snow, Whiteside is significantly snowier than nearby Will County. It experiences only 15 days of extreme heat, fewer than almost any county to its south.
Harsh winters and mild summers
Winters are intense, with a January average of 20.9°F and substantial snowfall. Summers remain pleasant, averaging 71.8°F with very few days of oppressive heat.
Winter gear is a priority
Heavy-duty snow removal equipment is a must for the 30 inches of annual snowfall. Residents should prioritize home insulation and high-performance heating for the sub-freezing winter months.
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.