| 2023 Hardiness Zone: | Zone 8b: 15°F to 20°F Zone 9a: 20°F to 25°F |
| 2012 Hardiness Zone: | Zone 8b: 15°F to 20°F Zone 8a: 10°F to 15°F |
| 1990 Hardiness Zone: | Zone 8a: 10F to 15F |
| Average First Frost Date: | Nov. 11 - Nov. 20 |
| Average Last Frost Date: | Mar. 11 - Mar. 20 |
| Koppen-Geiger Climate Zone: | Cfa - Humid Subtropical Climate |
| Ecoregion: | 65l - Vidalia Upland |
| Heat Zone Days: | 121 - 150 days Over 86°F |
Annual Climate Data for ZIP Code 30442 - Millen, GA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 35 | 36 | 43 | 49 | 58 | 66 | 69 | 69 | 63 | 52 | 43 | 36 | 52 |
| Avg Max Temp (°F) | 58 | 63 | 70 | 77 | 84 | 90 | 92 | 91 | 86 | 78 | 70 | 61 | 77 |
| Avg Precip (In.) | 4.46 | 4.02 | 4.38 | 2.91 | 3.09 | 4.52 | 4.78 | 4.56 | 3.36 | 2.88 | 2.74 | 3.47 | 45.18 |