Amherst, Colorado has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 36 °F (low) to 64.4 °F (high). Annual precipitation averages 17.9 Inches. Amherst is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 15.5 °F | 41.8 °F | 0.33 in. |
| February | 17.1 °F | 44.0 °F | 0.45 in. |
| March | 25.1 °F | 54.2 °F | 0.87 in. |
| April | 33.2 °F | 62.0 °F | 1.93 in. |
| May | 44.4 °F | 71.5 °F | 2.85 in. |
| June | 54.9 °F | 83.3 °F | 2.81 in. |
| July | 60.4 °F | 89.0 °F | 2.8 in. |
| August | 58.1 °F | 87.0 °F | 2.31 in. |
| September | 48.3 °F | 79.7 °F | 1.36 in. |
| October | 34.9 °F | 65.6 °F | 1.29 in. |
| November | 24.0 °F | 52.8 °F | 0.5 in. |
| December | 15.7 °F | 42.3 °F | 0.37 in. |
| Annual | 36 °F | 64.4 °F | 17.87 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5b : -15°F to -10°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |