Gallaway, Tennessee has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 10.9 °C (low) to 21.9 °C (high). Annual precipitation averages 1412.2 Millimeters. Gallaway is located in USDA Plant Hardiness Zone 8a. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -0.6 °C | 9.2 °C | 104.65 mm |
| February | 1.3 °C | 11.9 °C | 118.11 mm |
| March | 5.5 °C | 16.9 °C | 139.95 mm |
| April | 10.6 °C | 22.3 °C | 144.78 mm |
| May | 16 °C | 26.9 °C | 142.49 mm |
| June | 20.4 °C | 31.1 °C | 113.28 mm |
| July | 22.2 °C | 32.6 °C | 109.73 mm |
| August | 21.2 °C | 32.3 °C | 82.3 mm |
| September | 17.2 °C | 29.2 °C | 95.5 mm |
| October | 10.7 °C | 23.3 °C | 102.36 mm |
| November | 4.8 °C | 16.4 °C | 115.57 mm |
| December | 1.1 °C | 10.8 °C | 143.51 mm |
| Annual | 10.9 °C | 21.9 °C | 1412.23 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 8a : -12.2°C to -9.4°C |
| Plant Hardiness Zone - 2012 | Zone 7b : -15°C to -12.2°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |