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.
Naperville, month by month
| Month | Avg high | Avg low | Precip | Snow |
|---|---|---|---|---|
| Jan | 33°F | 17°F | 2.12in | 9.3in |
| Feb | 38°F | 20°F | 1.96in | 5.1in |
| Mar | 50°F | 29°F | 2.46in | 4.5in |
| Apr | 63°F | 38°F | 4.1in | 0.3in |
| May | 74°F | 49°F | 4.46in | 0in |
| Jun | 83°F | 59°F | 4.65in | 0in |
| Jul | 86°F | 63°F | 3.86in | 0in |
| Aug | 84°F | 62°F | 4.4in | 0in |
| Sep | 78°F | 54°F | 3.3in | 0in |
| Oct | 65°F | 43°F | 3.56in | 0in |
| Nov | 50°F | 32°F | 2.81in | 0.9in |
| Dec | 38°F | 23°F | 2.22in | 4.2in |
If you're timing a visit, May, Jun, Jul, Aug, and Sep are Naperville's mildest stretch; if you're moving there, you should plan around Jan's cold instead.
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