Marfa, Texas has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 6.9 °C (low) to 24.6 °C (high). Annual precipitation averages 343.9 Millimeters. Marfa is located in USDA Plant Hardiness Zone 8a. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -2.7 °C | 14.9 °C | 14.48 mm |
| February | -1 °C | 17.7 °C | 11.94 mm |
| March | 2.1 °C | 21.4 °C | 8.38 mm |
| April | 5.9 °C | 25.8 °C | 11.43 mm |
| May | 11.1 °C | 29.8 °C | 23.37 mm |
| June | 15.7 °C | 32.9 °C | 41.91 mm |
| July | 16.6 °C | 31.8 °C | 70.1 mm |
| August | 16.2 °C | 31.6 °C | 58.42 mm |
| September | 12.9 °C | 28.6 °C | 53.85 mm |
| October | 7.4 °C | 25.3 °C | 26.42 mm |
| November | 1.1 °C | 19.7 °C | 12.19 mm |
| December | -2.3 °C | 15.4 °C | 11.43 mm |
| Annual | 6.9 °C | 24.6 °C | 343.92 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 8a : -12.2°C to -9.4°C |
| Plant Hardiness Zone - 2012 | Zone 7b : -15°C to -12.2°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |