Carol Stream, IL Weather & Climate Normals
What a normal year in Carol Stream actually looks like
On the 30-year record NOAA keeps for Carol Stream, IL, the comfort score comes out to 48/100, strongly seasonal: Comfortable weather is limited to a shorter window; summers, winters, or precipitation swing wide. Only 5 months a year land in the 55–75°F range this site treats as mild.
How much Carol Stream's weather actually swings
Average temperatures in Carol Stream run from 23°F in Jan up to 74°F in Jul, a 50.4°F seasonal swing, one of the widest gaps in this dataset.
How wet Carol Stream actually gets
Carol Stream averages 33.23in of precipitation a year across roughly 121 days with measurable rain or snow; the nearest NOAA station does not record snowfall, so no snow figure is shown rather than guessed.
Carol Stream against the rest of the country
Out of 4876 cities scored here, Carol Stream comes in at 2327; within IL alone it ranks 36 of 330. Population is about 39,556.
Checking the actual forecast
These figures come from WEST CHICAGO DUPAGE AP, IL US, the NOAA station 5.8 miles from Carol Stream, averaged over 30 years, not tomorrow's forecast.
More on how this is worked out
Why some cities show no snow or rain figure · What a 30-year climate normal actually is