| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F | |
| 2012 Hardiness Zone: | 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: | 54b - Chicago Lake Plain | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 60091 - Wilmette, IL | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 15 | 19 | 29 | 38 | 48 | 58 | 64 | 63 | 55 | 43 | 32 | 21 | 40 |
| Avg Max Temp (°F) | 30 | 35 | 46 | 58 | 69 | 79 | 83 | 81 | 75 | 63 | 48 | 35 | 59 |
| Avg Precip (In.) | 1.81 | 1.57 | 2.55 | 3.71 | 3.55 | 3.87 | 3.66 | 4.23 | 3.34 | 2.67 | 2.96 | 2.39 | 36.32 |