Gumlog, Georgia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 10.6 °C (low) to 22.5 °C (high). Annual precipitation averages 1326.7 Millimeters. Gumlog is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 0.2 °C | 11.7 °C | 120.14 mm |
| February | 1.8 °C | 13.8 °C | 114.05 mm |
| March | 5.3 °C | 18 °C | 121.41 mm |
| April | 9.6 °C | 23 °C | 101.35 mm |
| May | 14.7 °C | 26.9 °C | 98.55 mm |
| June | 19.2 °C | 30.7 °C | 114.05 mm |
| July | 21.1 °C | 32.4 °C | 107.7 mm |
| August | 20.7 °C | 31.4 °C | 122.68 mm |
| September | 17.4 °C | 28.6 °C | 100.08 mm |
| October | 10.8 °C | 23.4 °C | 99.82 mm |
| November | 4.7 °C | 17.5 °C | 101.09 mm |
| December | 1.8 °C | 13.1 °C | 125.73 mm |
| Annual | 10.6 °C | 22.5 °C | 1326.65 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 8b : -9.4°C to -6.7°C |
| Plant Hardiness Zone - 2012 | Zone 8a : -12.2°C to -9.4°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |