Whiteside County Climate
Whiteside County, Illinois
Avg Annual Temp
49.1°F
Annual Precip
37.9"
Annual Snowfall
30.0"
Extreme Heat Days
15.25
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
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 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.