Farwell, Texas has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 5.8 °C (low) to 22.5 °C (high). Annual precipitation averages 438.4 Millimeters. Farwell 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. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -4.9 °C | 11.4 °C | 13.21 mm |
| February | -3.3 °C | 14 °C | 9.65 mm |
| March | 0.2 °C | 18.4 °C | 22.35 mm |
| April | 4.1 °C | 22.5 °C | 22.61 mm |
| May | 9.9 °C | 27.3 °C | 46.99 mm |
| June | 15.4 °C | 32.4 °C | 58.93 mm |
| July | 17.4 °C | 33 °C | 62.48 mm |
| August | 16.7 °C | 32.1 °C | 69.6 mm |
| September | 12.8 °C | 28.4 °C | 51.56 mm |
| October | 6.1 °C | 22.7 °C | 47.24 mm |
| November | -0.2 °C | 16.5 °C | 16.26 mm |
| December | -4.3 °C | 11.6 °C | 17.53 mm |
| Annual | 5.8 °C | 22.5 °C | 438.41 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 7a : -17.8°C to -15°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |