Huntsville, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 57.1 °F (low) to 78.3 °F (high). Annual precipitation averages 49.9 Inches. Huntsville is located in USDA Plant Hardiness Zone 9a. 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 | 39.6 °F | 60.4 °F | 4.3 in. |
| February | 43.1 °F | 64.3 °F | 3.37 in. |
| March | 49.4 °F | 71.2 °F | 3.94 in. |
| April | 56.1 °F | 78.0 °F | 3.88 in. |
| May | 64.7 °F | 85.0 °F | 4.61 in. |
| June | 71.2 °F | 91.0 °F | 4.79 in. |
| July | 73.5 °F | 93.8 °F | 3.1 in. |
| August | 73.1 °F | 94.8 °F | 3.82 in. |
| September | 67.7 °F | 89.2 °F | 3.9 in. |
| October | 57.8 °F | 80.6 °F | 5.0 in. |
| November | 48.0 °F | 69.9 °F | 4.65 in. |
| December | 41.2 °F | 61.9 °F | 4.5 in. |
| Annual | 57.1 °F | 78.3 °F | 49.86 in. |
| Average First Frost Date | Nov. 21 - Nov. 30 |
| Average Last Frost Date | Feb. 21 - Feb. 29 |
| Average Days With Frost | 10-20 Days |
| Plant Hardiness Zone | Zone 9a : 20°F to 25°F |
| Plant Hardiness Zone - 2012 | Zone 8b : 15°F to 20°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |