| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F |
| 2012 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 5b: -15°F to -10°F |
| 1990 Hardiness Zone: | Zone 1b: -15F to -10F |
| Average First Frost Date: | Oct. 21 - Oct. 31 |
| Average Last Frost Date: | Apr. 21 - Apr. 30 |
| Koppen-Geiger Climate Zone: | Dfa - Humid Continental Hot Summers |
| Ecoregion: | 54f - Valparaiso-Wheaton Morainal Complex |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 60093 - Winnetka, IL | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 14 | 19 | 28 | 37 | 48 | 57 | 63 | 62 | 54 | 42 | 32 | 20 | 40 |
| Avg Max Temp (°F) | 30 | 35 | 45 | 57 | 68 | 78 | 82 | 81 | 74 | 62 | 48 | 35 | 58 |
| Avg Precip (In.) | 1.76 | 1.52 | 2.48 | 3.71 | 3.49 | 3.83 | 3.66 | 4.25 | 3.36 | 2.62 | 2.88 | 2.3 | 35.87 |