| 2023 Hardiness Zone: | Zone 6b: -5°F to 0°F Zone 7a: 0°F to 5°F |
| 2012 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 6b: -5°F to 0°F |
| 1990 Hardiness Zone: | Zone 6a: -10F to -5F |
| Average First Frost Date: | Oct. 21 - Oct. 31 |
| Average Last Frost Date: | Apr. 11 - Apr. 20 |
| Koppen-Geiger Climate Zone: | Cfa - Humid Subtropical Climate |
| Ecoregion: | 72j - Southern Illinoian Till Plain |
| Heat Zone Days: | 61 - 90 days Over 86°F |
Annual Climate Data for ZIP Code 62225 - Scott Air Force Base, IL | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 22 | 26 | 35 | 44 | 54 | 63 | 67 | 64 | 56 | 45 | 36 | 26 | 45 |
| Avg Max Temp (°F) | 39 | 46 | 57 | 68 | 77 | 86 | 90 | 88 | 81 | 71 | 56 | 44 | 67 |
| Avg Precip (In.) | 2.05 | 2.24 | 3.56 | 3.91 | 4.2 | 3.95 | 3.55 | 3.31 | 3.04 | 2.89 | 3.9 | 3 | 39.61 |