Swainsboro, Georgia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 12.2 °C (low) to 25 °C (high). Annual precipitation averages 1191 Millimeters. 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 | 2.6 °C | 15.1 °C | 103.89 mm |
| February | 4 °C | 17.2 °C | 101.09 mm |
| March | 7.2 °C | 21.1 °C | 108.2 mm |
| April | 11 °C | 25.2 °C | 90.17 mm |
| May | 15.9 °C | 29.2 °C | 73.41 mm |
| June | 20.2 °C | 32.2 °C | 121.41 mm |
| July | 21.8 °C | 33.8 °C | 123.19 mm |
| August | 21.7 °C | 33.1 °C | 129.54 mm |
| September | 18.8 °C | 30.4 °C | 99.06 mm |
| October | 12.6 °C | 25.7 °C | 72.9 mm |
| November | 6.6 °C | 20.4 °C | 68.33 mm |
| December | 3.7 °C | 16.3 °C | 99.82 mm |
| Annual | 12.2 °C | 25 °C | 1191.01 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 |