| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F |
| 2012 Hardiness Zone: | Zone 6a: -10°F to -5°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 |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 60618 - Chicago, IL | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 15 | 20 | 29 | 39 | 49 | 59 | 64 | 63 | 55 | 44 | 33 | 21 | 41 |
| Avg Max Temp (°F) | 31 | 36 | 47 | 59 | 70 | 80 | 84 | 82 | 75 | 64 | 48 | 36 | 59 |
| Avg Precip (In.) | 1.9 | 1.64 | 2.7 | 3.72 | 3.64 | 4.05 | 3.7 | 4.16 | 3.33 | 2.7 | 3.13 | 2.52 | 37.2 |