Winnetka, IL Weather & Climate Normals
Winnetka's real weather, in one number
Winnetka, IL scores 44/100 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.
Winnetka's hottest and coldest months
Winnetka's hottest month is Jul, averaging 74°F; its coldest is Jan, averaging 24°F, a 49.2°F swing across the year, one of the widest gaps in this dataset.
Winnetka's weather across the year
| Month | Avg high | Avg low | Precip | Snow |
|---|---|---|---|---|
| Jan | 32°F | 16°F | 2.1in | 11.3in |
| Feb | 36°F | 19°F | 1.98in | 7.7in |
| Mar | 46°F | 28°F | 2.26in | 5.6in |
| Apr | 57°F | 38°F | 4in | 1.1in |
| May | 68°F | 48°F | 4.84in | 0in |
| Jun | 78°F | 57°F | 4.31in | 0in |
| Jul | 84°F | 63°F | 3.74in | 0in |
| Aug | 82°F | 62°F | 4.16in | 0in |
| Sep | 75°F | 55°F | 3.56in | 0in |
| Oct | 63°F | 43°F | 3.59in | 0.1in |
| Nov | 49°F | 33°F | 2.63in | 1.9in |
| Dec | 38°F | 22°F | 2.34in | 5.9in |
May, Jun, Jul, Aug, and Sep are the best time to see Winnetka at its mildest; the rest of the year, plan around Jan's cold.
Rain and snow in Winnetka
Winnetka averages 39.51in of precipitation a year across roughly 130 days with measurable rain or snow, and 33.6in of snow a year.
Where Winnetka ranks
Winnetka ranks 3806 of 4876 US cities in this dataset for comfort score, and 204 of 330 within IL. About 12,494 people live there.
If you need tomorrow's forecast, not the 30-year average
Everything above is a 30-year average from Chicago Botanic Garden, IL US, 3.2 miles from Winnetka, 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