Gallatin, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 12.6 °C (low) to 25.4 °C (high). Annual precipitation averages 1233.9 Millimeters. Gallatin is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 1 - Mar. 10 through the first frost around Nov. 21 - Nov. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 2.4 °C | 15 °C | 105.66 mm |
| February | 4.3 °C | 17.3 °C | 100.33 mm |
| March | 8.1 °C | 21.3 °C | 111.51 mm |
| April | 11.7 °C | 25.2 °C | 103.12 mm |
| May | 17.2 °C | 29.1 °C | 118.87 mm |
| June | 21.1 °C | 32.6 °C | 117.6 mm |
| July | 22.4 °C | 34.6 °C | 74.42 mm |
| August | 22.1 °C | 35 °C | 84.07 mm |
| September | 18.4 °C | 31.8 °C | 87.38 mm |
| October | 12.5 °C | 26.5 °C | 109.98 mm |
| November | 7.2 °C | 20.3 °C | 104.9 mm |
| December | 3.2 °C | 15.8 °C | 116.08 mm |
| Annual | 12.6 °C | 25.4 °C | 1233.92 mm |
| Average First Frost Date | Nov. 21 - Nov. 30 |
| Average Last Frost Date | Mar. 1 - Mar. 10 |
| Average Days With Frost | 20-30 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 | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |