| 2023 Hardiness Zone: | Zone 8b: 15°F to 20°F Zone 8a: 10°F to 15°F |
| 2012 Hardiness Zone: | Zone 8a: 10°F to 15°F |
| 1990 Hardiness Zone: | Zone 7b: 5F to 10F |
| Average First Frost Date: | Nov. 11 - Nov. 20 |
| Average Last Frost Date: | Mar. 21 - Mar. 31 |
| Koppen-Geiger Climate Zone: | Cfa - Humid Subtropical Climate |
| Ecoregion: | 45b - Southern Outer Piedmont |
| Heat Zone Days: | 61 - 90 days Over 86°F |
Annual Climate Data for ZIP Code 30296 - Riverdale, GA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 33 | 35 | 42 | 49 | 58 | 66 | 70 | 69 | 63 | 52 | 43 | 35 | 51 |
| Avg Max Temp (°F) | 52 | 57 | 65 | 73 | 80 | 86 | 89 | 88 | 82 | 73 | 63 | 55 | 72 |
| Avg Precip (In.) | 5.17 | 4.77 | 5.47 | 3.77 | 4.03 | 3.72 | 4.86 | 3.76 | 3.76 | 3.14 | 4.05 | 3.93 | 50.43 |