Cotulla, Texas has a Hot Semi-Arid Climate climate (Köppen classification: BSh). Average annual temperatures range from 59.7 °F (low) to 84.1 °F (high). Annual precipitation averages 22.5 Inches. Cotulla is located in USDA Plant Hardiness Zone 9a.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 42.1 °F | 66.8 °F | 0.97 in. |
| February | 46.3 °F | 71.4 °F | 1.02 in. |
| March | 53.0 °F | 78.0 °F | 1.73 in. |
| April | 59.4 °F | 85.1 °F | 1.64 in. |
| May | 67.8 °F | 91.2 °F | 2.85 in. |
| June | 73.1 °F | 96.6 °F | 2.2 in. |
| July | 74.1 °F | 98.4 °F | 2.01 in. |
| August | 74.6 °F | 99.4 °F | 1.83 in. |
| September | 70.1 °F | 93.1 °F | 3.48 in. |
| October | 61.1 °F | 85.7 °F | 2.31 in. |
| November | 51.3 °F | 75.6 °F | 1.28 in. |
| December | 43.2 °F | 67.7 °F | 1.22 in. |
| Annual | 59.7 °F | 84.1 °F | 22.54 in. |
| Average First Frost Date | Frost Rare |
| Average Last Frost Date | |
| Average Days With Frost | Frost Rare |
| Plant Hardiness Zone | Zone 9a : 20°F to 25°F |
| Plant Hardiness Zone - 2012 | Zone 9a : 20°F to 25°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | BSh - Hot Semi-Arid Climate |