Garland, Tennessee has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 10.5 °C (low) to 21.4 °C (high). Annual precipitation averages 1389.7 Millimeters. Garland 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 | -0.9 °C | 8.4 °C | 104.9 mm |
| February | 0.7 °C | 11.1 °C | 114.3 mm |
| March | 5 °C | 16.1 °C | 133.86 mm |
| April | 10.2 °C | 21.8 °C | 135.38 mm |
| May | 15.8 °C | 26.5 °C | 143.51 mm |
| June | 20.2 °C | 30.7 °C | 111.51 mm |
| July | 21.8 °C | 32.2 °C | 108.97 mm |
| August | 20.7 °C | 31.8 °C | 84.84 mm |
| September | 16.7 °C | 28.7 °C | 92.46 mm |
| October | 10.3 °C | 23 °C | 95.76 mm |
| November | 4.7 °C | 15.8 °C | 119.63 mm |
| December | 0.7 °C | 10.2 °C | 144.53 mm |
| Annual | 10.5 °C | 21.4 °C | 1389.65 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 | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |