Downers Grove, IL Weather & Climate Normals
What a normal year in Downers Grove actually looks like
On the 30-year record NOAA keeps for Downers Grove, IL, the comfort score comes out to 45/100, 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 Downers Grove's weather actually swings
Average temperatures in Downers Grove run from 25°F in Jan up to 74°F in Jul, a 49.5°F seasonal swing, one of the widest gaps in this dataset.
How wet Downers Grove actually gets
Over a typical year, Downers Grove sees about 39.9in of precipitation a year across roughly 116 days with measurable rain or snow, with 24.3in of snow a year.
Downers Grove against the rest of the country
Out of 4876 cities scored here, Downers Grove comes in at 3247; within IL alone it ranks 116 of 330. Population is about 50,552.
Checking the actual forecast
These figures come from WHEATON 3 SE, IL US, the NOAA station 2.9 miles from Downers Grove, 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