Twin City, Georgia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 12.2 °C (low) to 24.9 °C (high). Annual precipitation averages 1210.8 Millimeters. Twin City 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 | 104.65 mm |
| February | 4.1 °C | 17.2 °C | 101.6 mm |
| March | 7.3 °C | 21 °C | 104.39 mm |
| April | 11.1 °C | 25.2 °C | 86.87 mm |
| May | 16.1 °C | 29.2 °C | 79.76 mm |
| June | 20.2 °C | 32.1 °C | 129.03 mm |
| July | 21.9 °C | 33.7 °C | 127.25 mm |
| August | 21.7 °C | 32.9 °C | 134.87 mm |
| September | 18.8 °C | 30.3 °C | 95.25 mm |
| October | 12.6 °C | 25.6 °C | 72.39 mm |
| November | 6.6 °C | 20.4 °C | 71.12 mm |
| December | 3.7 °C | 16.4 °C | 103.63 mm |
| Annual | 12.2 °C | 24.9 °C | 1210.81 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 |