| 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 60631 - Chicago, IL | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 14 | 19 | 29 | 38 | 48 | 58 | 64 | 62 | 54 | 42 | 32 | 21 | 40 |
| Avg Max Temp (°F) | 30 | 35 | 46 | 58 | 70 | 79 | 84 | 82 | 75 | 63 | 48 | 35 | 59 |
| Avg Precip (In.) | 1.77 | 1.59 | 2.63 | 3.72 | 3.54 | 3.91 | 3.66 | 4.45 | 3.33 | 2.66 | 3.04 | 2.44 | 36.75 |