Amherst, Texas has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 6.4 °C (low) to 23.2 °C (high). Annual precipitation averages 458 Millimeters. Amherst is located in USDA Plant Hardiness Zone 7b. 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 | -4.7 °C | 12.1 °C | 14.48 mm |
| February | -3.2 °C | 14.7 °C | 13.46 mm |
| March | 0.8 °C | 19.1 °C | 26.42 mm |
| April | 4.8 °C | 23.6 °C | 26.16 mm |
| May | 10.9 °C | 28.1 °C | 54.86 mm |
| June | 16.4 °C | 32.7 °C | 70.61 mm |
| July | 18.2 °C | 33.4 °C | 55.88 mm |
| August | 17.3 °C | 32.6 °C | 59.94 mm |
| September | 13.3 °C | 28.8 °C | 59.94 mm |
| October | 6.6 °C | 23.7 °C | 38.86 mm |
| November | 0 °C | 17.2 °C | 19.81 mm |
| December | -3.8 °C | 12.5 °C | 17.53 mm |
| Annual | 6.4 °C | 23.2 °C | 457.95 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 7b : -15°C to -12.2°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 |