Fort Gaines, Georgia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 12.6 °C (low) to 25 °C (high). Annual precipitation averages 1365.3 Millimeters. 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 | 3.1 °C | 15.6 °C | 125.22 mm |
| February | 4.7 °C | 17.8 °C | 119.89 mm |
| March | 7.9 °C | 21.8 °C | 128.02 mm |
| April | 11.4 °C | 25.2 °C | 111.51 mm |
| May | 16.4 °C | 29.2 °C | 80.77 mm |
| June | 20.5 °C | 31.7 °C | 137.67 mm |
| July | 21.9 °C | 32.8 °C | 148.59 mm |
| August | 21.6 °C | 32.3 °C | 114.81 mm |
| September | 19.1 °C | 30.3 °C | 99.31 mm |
| October | 13 °C | 25.8 °C | 66.29 mm |
| November | 7.2 °C | 20.7 °C | 101.6 mm |
| December | 4.5 °C | 16.7 °C | 131.57 mm |
| Annual | 12.6 °C | 25 °C | 1365.25 mm |
| 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 : -9.4°C to -6.7°C |
| Plant Hardiness Zone - 2012 | Zone 8b : -9.4°C to -6.7°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |