Gallatin, Tennessee has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 8.5 °C (low) to 20.8 °C (high). Annual precipitation averages 1353.3 Millimeters. Gallatin is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -2.6 °C | 7.9 °C | 105.92 mm |
| February | -1.2 °C | 10.6 °C | 117.35 mm |
| March | 2.8 °C | 15.6 °C | 124.46 mm |
| April | 7.6 °C | 21.2 °C | 124.97 mm |
| May | 13 °C | 25.7 °C | 139.7 mm |
| June | 17.8 °C | 29.7 °C | 119.13 mm |
| July | 20 °C | 31.6 °C | 117.09 mm |
| August | 19.4 °C | 31.3 °C | 95 mm |
| September | 15.2 °C | 28.2 °C | 97.54 mm |
| October | 8.3 °C | 22.2 °C | 91.95 mm |
| November | 2.3 °C | 15.3 °C | 97.79 mm |
| December | -0.6 °C | 9.9 °C | 122.43 mm |
| Annual | 8.5 °C | 20.8 °C | 1353.33 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7b : -15°C to -12.2°C |
| Plant Hardiness Zone - 2012 | Zone 7a : -17.8°C to -15°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |