Dell City, Texas has a Cold Desert Climate climate (Köppen classification: BWk). Average annual temperatures range from 7.7 °C (low) to 26.6 °C (high). Annual precipitation averages 230.6 Millimeters. Dell City is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Feb. 21 - Feb. 29 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -2.9 °C | 15.5 °C | 7.11 mm |
| February | -0.8 °C | 18.6 °C | 8.38 mm |
| March | 2.8 °C | 22.8 °C | 10.16 mm |
| April | 6.8 °C | 27.6 °C | 5.08 mm |
| May | 12.2 °C | 32.2 °C | 17.78 mm |
| June | 17.1 °C | 36.9 °C | 25.4 mm |
| July | 19 °C | 36.2 °C | 42.42 mm |
| August | 18.4 °C | 35.2 °C | 29.46 mm |
| September | 14.4 °C | 32.1 °C | 37.34 mm |
| October | 7.4 °C | 27 °C | 23.88 mm |
| November | 0.9 °C | 20.1 °C | 11.68 mm |
| December | -3.1 °C | 14.8 °C | 11.94 mm |
| Annual | 7.7 °C | 26.6 °C | 230.63 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Feb. 21 - Feb. 29 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 7b : -15°C to -12.2°C |
| Plant Hardiness Zone - 2012 | Zone 7b : -15°C to -12.2°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | BWk - Cold Desert Climate |