| 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: | Nov. 1 - Nov. 10 |
| Average Last Frost Date: | Apr. 1 - Apr. 10 |
| Koppen-Geiger Climate Zone: | Dfa - Humid Continental Hot Summers |
| Ecoregion: | 72e - Middle Mississippi Alluvial Plain |
| Heat Zone Days: | 46 - 60 days Over 86°F |
Annual Climate Data for ZIP Code 62024 - East Alton, IL | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 19 | 24 | 34 | 45 | 55 | 64 | 69 | 66 | 58 | 46 | 35 | 24 | 45 |
| Avg Max Temp (°F) | 36 | 42 | 53 | 64 | 75 | 84 | 88 | 86 | 79 | 68 | 53 | 41 | 64 |
| Avg Precip (In.) | 2.06 | 2.22 | 3.48 | 4.02 | 4.26 | 3.36 | 3.63 | 3.28 | 3.13 | 2.76 | 3.77 | 2.92 | 38.89 |