Dalhart, Texas has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 4.8 °C (low) to 21.5 °C (high). Annual precipitation averages 425.5 Millimeters. Dalhart is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -6.4 °C | 9.8 °C | 15.24 mm |
| February | -5.1 °C | 11.9 °C | 11.18 mm |
| March | -1.2 °C | 16.7 °C | 24.64 mm |
| April | 3.2 °C | 20.9 °C | 31.5 mm |
| May | 9.1 °C | 26.1 °C | 48.01 mm |
| June | 14.8 °C | 31.6 °C | 55.37 mm |
| July | 17.3 °C | 33.4 °C | 55.37 mm |
| August | 16.5 °C | 32.2 °C | 70.1 mm |
| September | 12.2 °C | 28.5 °C | 35.05 mm |
| October | 4.8 °C | 22.1 °C | 46.74 mm |
| November | -1.7 °C | 15.3 °C | 14.22 mm |
| December | -6.1 °C | 9.7 °C | 18.03 mm |
| Annual | 4.8 °C | 21.5 °C | 425.45 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |