Hermleigh, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 50.5 °F (low) to 76.4 °F (high). Annual precipitation averages 21.8 Inches. Hermleigh 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 | 30.4 °F | 56.5 °F | 0.86 in. |
| February | 33.5 °F | 60.9 °F | 1.08 in. |
| March | 41.0 °F | 69.0 °F | 1.5 in. |
| April | 49.0 °F | 77.6 °F | 1.57 in. |
| May | 58.8 °F | 85.1 °F | 2.88 in. |
| June | 67.0 °F | 91.6 °F | 2.96 in. |
| July | 70.4 °F | 94.9 °F | 1.75 in. |
| August | 69.7 °F | 94.2 °F | 2.17 in. |
| September | 62.6 °F | 86.7 °F | 2.77 in. |
| October | 51.6 °F | 77.3 °F | 2.01 in. |
| November | 39.8 °F | 65.8 °F | 1.25 in. |
| December | 31.8 °F | 57.3 °F | 1.01 in. |
| Annual | 50.5 °F | 76.4 °F | 21.81 in. |
| 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 : 10°F to 15°F |
| Plant Hardiness Zone - 2012 | Zone 7b : 5°F to 10°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |