Westmont, IL Weather & Climate Normals
Westmont's real weather, in one number
Westmont, IL scores 45/100 on this site's reading of NOAA's own 30-year normals: strongly seasonal. Comfortable weather is limited to a shorter window; summers, winters, or precipitation swing wide. 5 of the year's 12 months average between 55 and 75°F, the range this site counts as mild.
Westmont's hottest and coldest months
Westmont's hottest month is Jul, averaging 74°F; its coldest is Jan, averaging 25°F, a 49.5°F swing across the year, one of the widest gaps in this dataset.
Westmont's weather across the year
| 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 |
May, Jun, Jul, Aug, and Sep are the best time to see Westmont at its mildest; the rest of the year, plan around Jan's cold.
Rain and snow in Westmont
Westmont averages 39.9in of precipitation a year across roughly 116 days with measurable rain or snow, and 24.3in of snow a year.
Where Westmont ranks
Westmont ranks 3317 of 4876 US cities in this dataset for comfort score, and 125 of 330 within IL. About 24,308 people live there.
If you need tomorrow's forecast, not the 30-year average
Everything above is a 30-year average from Wheaton 3 Se, IL US, 5.3 miles from Westmont, not a prediction for any specific day.
More on how this is worked out
How the comfort score is calculated · Why some cities show no snow or rain figure