Gillsville, Georgia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 10.2 °C (low) to 21.8 °C (high). Annual precipitation averages 1376.2 Millimeters. Gillsville is located in USDA Plant Hardiness Zone 8a. 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 | 0 °C | 11.1 °C | 125.98 mm |
| February | 1.4 °C | 13.2 °C | 122.43 mm |
| March | 4.8 °C | 17.6 °C | 125.73 mm |
| April | 9.1 °C | 22.1 °C | 107.19 mm |
| May | 14.1 °C | 25.9 °C | 98.3 mm |
| June | 18.6 °C | 29.6 °C | 126.49 mm |
| July | 20.7 °C | 31.4 °C | 111.51 mm |
| August | 20.1 °C | 30.7 °C | 124.21 mm |
| September | 16.8 °C | 27.8 °C | 101.35 mm |
| October | 10.3 °C | 22.6 °C | 102.11 mm |
| November | 4.5 °C | 17.1 °C | 104.65 mm |
| December | 1.6 °C | 12.5 °C | 126.24 mm |
| Annual | 10.2 °C | 21.8 °C | 1376.19 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 11 - Mar. 20 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 8a : -12.2°C to -9.4°C |
| Plant Hardiness Zone - 2012 | Zone 8a : -12.2°C to -9.4°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |