Fort Gaines, Georgia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 54.7 °F (low) to 77 °F (high). Annual precipitation averages 53.8 Inches. Fort Gaines is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 11 - Mar. 20 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 37.6 °F | 60.0 °F | 4.93 in. |
| February | 40.4 °F | 64.0 °F | 4.72 in. |
| March | 46.2 °F | 71.3 °F | 5.04 in. |
| April | 52.6 °F | 77.3 °F | 4.39 in. |
| May | 61.6 °F | 84.5 °F | 3.18 in. |
| June | 68.9 °F | 89.1 °F | 5.42 in. |
| July | 71.5 °F | 91.1 °F | 5.85 in. |
| August | 70.9 °F | 90.2 °F | 4.52 in. |
| September | 66.3 °F | 86.5 °F | 3.91 in. |
| October | 55.4 °F | 78.4 °F | 2.61 in. |
| November | 44.9 °F | 69.2 °F | 4.0 in. |
| December | 40.1 °F | 62.1 °F | 5.18 in. |
| Annual | 54.7 °F | 77 °F | 53.75 in. |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 11 - Mar. 20 |
| Average Days With Frost | 30-40 Days |
| Plant Hardiness Zone | Zone 8b : 15°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 8b : 15°F to 20°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |