Cotulla, Texas has a Hot Semi-Arid Climate climate (Köppen classification: BSh). Average annual temperatures range from 15.4 °C (low) to 28.9 °C (high). Annual precipitation averages 572.5 Millimeters. Cotulla is located in USDA Plant Hardiness Zone 9a.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 5.6 °C | 19.3 °C | 24.64 mm |
| February | 7.9 °C | 21.9 °C | 25.91 mm |
| March | 11.7 °C | 25.6 °C | 43.94 mm |
| April | 15.2 °C | 29.5 °C | 41.66 mm |
| May | 19.9 °C | 32.9 °C | 72.39 mm |
| June | 22.8 °C | 35.9 °C | 55.88 mm |
| July | 23.4 °C | 36.9 °C | 51.05 mm |
| August | 23.7 °C | 37.4 °C | 46.48 mm |
| September | 21.2 °C | 33.9 °C | 88.39 mm |
| October | 16.2 °C | 29.8 °C | 58.67 mm |
| November | 10.7 °C | 24.2 °C | 32.51 mm |
| December | 6.2 °C | 19.8 °C | 30.99 mm |
| Annual | 15.4 °C | 28.9 °C | 572.51 mm |
| Average First Frost Date | Frost Rare |
| Average Last Frost Date | |
| Average Days With Frost | Frost Rare |
| Plant Hardiness Zone | Zone 9a : -6.7°C to -3.9°C |
| Plant Hardiness Zone - 2012 | Zone 9a : -6.7°C to -3.9°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | BSh - Hot Semi-Arid Climate |