Dilley, Texas has a Hot Semi-Arid Climate climate (Köppen classification: BSh). Average annual temperatures range from 15 °C (low) to 28.6 °C (high). Annual precipitation averages 638.3 Millimeters. Dilley is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Frost Rare through the first frost around Jan. 11 - Jan. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 5.3 °C | 19.2 °C | 31.5 mm |
| February | 7.4 °C | 21.8 °C | 28.96 mm |
| March | 11.4 °C | 25.3 °C | 53.09 mm |
| April | 14.9 °C | 28.9 °C | 38.1 mm |
| May | 19.4 °C | 32.3 °C | 85.6 mm |
| June | 22.4 °C | 35.3 °C | 61.47 mm |
| July | 23.2 °C | 36.4 °C | 58.67 mm |
| August | 23.2 °C | 36.9 °C | 48.77 mm |
| September | 20.7 °C | 33.6 °C | 98.3 mm |
| October | 15.9 °C | 29.7 °C | 63.25 mm |
| November | 10.4 °C | 23.8 °C | 37.08 mm |
| December | 6.1 °C | 19.8 °C | 33.53 mm |
| Annual | 15 °C | 28.6 °C | 638.32 mm |
| Average First Frost Date | Jan. 11 - Jan. 20 |
| Average Last Frost Date | Frost Rare |
| 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 |