Fort Oglethorpe, Georgia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 9.4 °C (low) to 22 °C (high). Annual precipitation averages 1354.1 Millimeters. Fort Oglethorpe is located in USDA Plant Hardiness Zone 8a. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -1.1 °C | 10.2 °C | 124.71 mm |
| February | 0.4 °C | 12.6 °C | 122.43 mm |
| March | 4 °C | 17.3 °C | 132.08 mm |
| April | 8.4 °C | 22.6 °C | 122.94 mm |
| May | 13.6 °C | 26.5 °C | 98.81 mm |
| June | 18.2 °C | 30.2 °C | 93.98 mm |
| July | 20.2 °C | 31.8 °C | 107.19 mm |
| August | 19.7 °C | 31.7 °C | 86.61 mm |
| September | 16.1 °C | 28.9 °C | 124.97 mm |
| October | 9.2 °C | 23.2 °C | 86.36 mm |
| November | 3.1 °C | 16.7 °C | 115.32 mm |
| December | 0.5 °C | 11.7 °C | 138.68 mm |
| Annual | 9.4 °C | 22 °C | 1354.08 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 8a : -12.2°C to -9.4°C |
| Plant Hardiness Zone - 2012 | Zone 7b : -15°C to -12.2°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |