Del Rio, Texas has a Hot Semi-Arid Climate climate (Köppen classification: BSh). Average annual temperatures range from 15.1 °C (low) to 27.8 °C (high). Annual precipitation averages 488.4 Millimeters. Del Rio is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Feb. 11 - Feb. 20 through the first frost around Dec. 1 - Dec. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 4.5 °C | 17.9 °C | 19.05 mm |
| February | 7 °C | 20.7 °C | 16.51 mm |
| March | 11.3 °C | 24.8 °C | 33.78 mm |
| April | 14.9 °C | 28.9 °C | 40.39 mm |
| May | 19.7 °C | 32.2 °C | 73.15 mm |
| June | 23.2 °C | 35.1 °C | 56.9 mm |
| July | 24.2 °C | 36.2 °C | 37.59 mm |
| August | 24.2 °C | 36.4 °C | 45.21 mm |
| September | 21.2 °C | 32.8 °C | 72.39 mm |
| October | 16 °C | 28.4 °C | 46.99 mm |
| November | 10.1 °C | 22.2 °C | 27.18 mm |
| December | 5.3 °C | 18.1 °C | 19.3 mm |
| Annual | 15.1 °C | 27.8 °C | 488.44 mm |
| Average First Frost Date | Dec. 1 - Dec. 10 |
| Average Last Frost Date | Feb. 11 - Feb. 20 |
| Average Days With Frost | 10-20 Days |
| 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 | Abnormally Dry |
| Köppen Climate Classification | BSh - Hot Semi-Arid Climate |