Brackettville, Texas has a Hot Semi-Arid Climate climate (Köppen classification: BSh). Average annual temperatures range from 58 °F (low) to 81.6 °F (high). Annual precipitation averages 21.4 Inches. Brackettville is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Feb. 1 - Feb. 10 through the first frost around Dec. 21 - Dec. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 39.1 °F | 63.9 °F | 0.91 in. |
| February | 43.4 °F | 68.6 °F | 1.0 in. |
| March | 51.0 °F | 76.2 °F | 1.69 in. |
| April | 57.7 °F | 83.2 °F | 1.42 in. |
| May | 66.3 °F | 88.8 °F | 2.89 in. |
| June | 72.2 °F | 93.8 °F | 2.92 in. |
| July | 73.9 °F | 96.2 °F | 1.99 in. |
| August | 74.2 °F | 97.0 °F | 1.71 in. |
| September | 69.0 °F | 90.8 °F | 2.82 in. |
| October | 59.7 °F | 83.6 °F | 1.84 in. |
| November | 49.0 °F | 72.1 °F | 1.31 in. |
| December | 40.4 °F | 64.5 °F | 0.86 in. |
| Annual | 58 °F | 81.6 °F | 21.36 in. |
| Average First Frost Date | Dec. 21 - Dec. 31 |
| Average Last Frost Date | Feb. 1 - Feb. 10 |
| Average Days With Frost | Frost Rare |
| 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 | BSh - Hot Semi-Arid Climate |