Garrett, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 55 °F (low) to 76.8 °F (high). Annual precipitation averages 41.4 Inches. Garrett 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. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 35.4 °F | 56.8 °F | 3.2 in. |
| February | 39.0 °F | 60.8 °F | 3.08 in. |
| March | 46.3 °F | 68.0 °F | 3.73 in. |
| April | 53.5 °F | 75.8 °F | 3.74 in. |
| May | 63.0 °F | 83.1 °F | 4.52 in. |
| June | 70.7 °F | 91.1 °F | 3.99 in. |
| July | 73.7 °F | 95.3 °F | 1.81 in. |
| August | 73.5 °F | 96.0 °F | 2.69 in. |
| September | 66.6 °F | 89.5 °F | 3.19 in. |
| October | 55.3 °F | 79.3 °F | 4.92 in. |
| November | 45.3 °F | 67.4 °F | 3.07 in. |
| December | 37.2 °F | 58.5 °F | 3.5 in. |
| Annual | 55 °F | 76.8 °F | 41.44 in. |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 1 - Mar. 10 |
| Average Days With Frost | 30-40 Days |
| Plant Hardiness Zone | Zone 8b : 15°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 8a : 10°F to 15°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |