| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 5b: -15°F to -10°F |
| 2012 Hardiness Zone: | Zone 5b: -15°F to -10°F |
| 1990 Hardiness Zone: | Zone 5a: -20F to -15F |
| Average First Frost Date: | Oct. 11 - Oct. 20 |
| Average Last Frost Date: | May 1 - May 10 |
| 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 60074 - Palatine, IL | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 12 | 17 | 27 | 37 | 47 | 57 | 62 | 61 | 53 | 41 | 30 | 19 | 38 |
| Avg Max Temp (°F) | 28 | 33 | 45 | 57 | 69 | 79 | 83 | 81 | 73 | 62 | 47 | 33 | 57 |
| Avg Precip (In.) | 1.62 | 1.42 | 2.4 | 3.68 | 3.73 | 4.17 | 3.8 | 4.47 | 3.4 | 2.56 | 2.95 | 2.11 | 36.31 |