Swainsboro, Georgia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 53.9 °F (low) to 77 °F (high). Annual precipitation averages 46.9 Inches. Swainsboro 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 | 36.6 °F | 59.2 °F | 4.09 in. |
| February | 39.2 °F | 63.0 °F | 3.98 in. |
| March | 45.0 °F | 70.0 °F | 4.26 in. |
| April | 51.8 °F | 77.4 °F | 3.55 in. |
| May | 60.7 °F | 84.6 °F | 2.89 in. |
| June | 68.3 °F | 89.9 °F | 4.78 in. |
| July | 71.3 °F | 92.8 °F | 4.85 in. |
| August | 71.0 °F | 91.5 °F | 5.1 in. |
| September | 65.8 °F | 86.7 °F | 3.9 in. |
| October | 54.7 °F | 78.2 °F | 2.87 in. |
| November | 43.9 °F | 68.7 °F | 2.69 in. |
| December | 38.7 °F | 61.4 °F | 3.93 in. |
| Annual | 53.9 °F | 77 °F | 46.89 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 | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |