Farmers Branch, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 56.7 °F (low) to 77 °F (high). Annual precipitation averages 39.9 Inches. Farmers Branch is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Feb. 21 - Feb. 29 through the first frost around Nov. 21 - Nov. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 36.2 °F | 56.6 °F | 2.67 in. |
| February | 40.0 °F | 60.9 °F | 2.94 in. |
| March | 47.5 °F | 68.2 °F | 3.61 in. |
| April | 55.4 °F | 76.3 °F | 3.53 in. |
| May | 64.9 °F | 83.7 °F | 4.83 in. |
| June | 72.9 °F | 91.6 °F | 3.84 in. |
| July | 76.3 °F | 96.1 °F | 2.08 in. |
| August | 76.0 °F | 96.2 °F | 2.26 in. |
| September | 68.9 °F | 89.4 °F | 3.03 in. |
| October | 57.4 °F | 79.2 °F | 4.74 in. |
| November | 46.6 °F | 67.2 °F | 3.04 in. |
| December | 38.3 °F | 58.6 °F | 3.29 in. |
| Annual | 56.7 °F | 77 °F | 39.86 in. |
| Average First Frost Date | Nov. 21 - Nov. 30 |
| Average Last Frost Date | Feb. 21 - Feb. 29 |
| Average Days With Frost | 20-30 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 |