| 2023 Hardiness Zone: | Zone 8a: 10°F to 15°F |
| 2012 Hardiness Zone: | Zone 8a: 10°F to 15°F Zone 7b: 5°F to 10°F |
| 1990 Hardiness Zone: | Zone 7b: 5F to 10F |
| Average First Frost Date: | Nov. 1 - Nov. 10 |
| Average Last Frost Date: | Apr. 1 - Apr. 10 |
| Koppen-Geiger Climate Zone: | Cfa - Humid Subtropical Climate |
| Ecoregion: | 45a - Southern Inner Piedmont |
| Heat Zone Days: | 15 - 30 days Over 86°F |
Annual Climate Data for ZIP Code 30510 - Alto, GA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 29 | 31 | 38 | 45 | 53 | 62 | 66 | 65 | 59 | 47 | 38 | 32 | 47 |
| Avg Max Temp (°F) | 50 | 54 | 62 | 71 | 77 | 84 | 87 | 86 | 80 | 71 | 62 | 53 | 70 |
| Avg Precip (In.) | 6.29 | 5.36 | 6.42 | 4.4 | 4.88 | 4.39 | 4.71 | 4.72 | 4.32 | 4.2 | 4.72 | 4.93 | 59.37 |