Naperville, IL Weather & Climate Normals
What a normal year in Naperville actually looks like
On the 30-year record NOAA keeps for Naperville, 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 Naperville's weather actually swings
Average temperatures in Naperville 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 Naperville actually gets
Over a typical year, Naperville sees about 39.9in of precipitation a year across roughly 116 days with measurable rain or snow, with 24.3in of snow a year.
Naperville against the rest of the country
Out of 4876 cities scored here, Naperville comes in at 3214; within IL alone it ranks 112 of 330. Population is about 153,124.
Checking the actual forecast
These figures come from WHEATON 3 SE, IL US, the NOAA station 6.4 miles from Naperville, 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