Millwood, Georgia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 13 °C (low) to 25.8 °C (high). Annual precipitation averages 1259.9 Millimeters. Millwood is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Mar. 1 - Mar. 10 through the first frost around Nov. 21 - Nov. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 3.6 °C | 16.8 °C | 110.24 mm |
| February | 5.2 °C | 18.8 °C | 96.52 mm |
| March | 8.2 °C | 22.4 °C | 112.78 mm |
| April | 12.1 °C | 26.1 °C | 84.84 mm |
| May | 16.4 °C | 29.8 °C | 74.68 mm |
| June | 20.6 °C | 32.3 °C | 147.07 mm |
| July | 22 °C | 33.4 °C | 138.68 mm |
| August | 21.9 °C | 32.9 °C | 155.96 mm |
| September | 19.5 °C | 30.7 °C | 110.49 mm |
| October | 13.7 °C | 26.6 °C | 82.55 mm |
| November | 7.6 °C | 21.9 °C | 60.71 mm |
| December | 4.8 °C | 18.2 °C | 85.34 mm |
| Annual | 13 °C | 25.8 °C | 1259.86 mm |
| Average First Frost Date | Nov. 21 - Nov. 30 |
| Average Last Frost Date | Mar. 1 - Mar. 10 |
| Average Days With Frost | 20-30 Days |
| Plant Hardiness Zone | Zone 9a : -6.7°C to -3.9°C |
| Plant Hardiness Zone - 2012 | Zone 8b : -9.4°C to -6.7°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |