Green Mountain Falls, Colorado has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 27.7 °F (low) to 57.6 °F (high). Annual precipitation averages 22.6 Inches. Green Mountain Falls is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around May 21 - May 31 through the first frost around Aug. 21 - Aug. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 10.1 °F | 39.9 °F | 0.7 in. |
| February | 11.7 °F | 40.5 °F | 0.82 in. |
| March | 18.6 °F | 48.3 °F | 1.69 in. |
| April | 25.0 °F | 53.6 °F | 2.49 in. |
| May | 33.7 °F | 62.5 °F | 2.79 in. |
| June | 42.4 °F | 74.2 °F | 1.99 in. |
| July | 48.2 °F | 79.0 °F | 3.5 in. |
| August | 46.9 °F | 76.6 °F | 3.61 in. |
| September | 38.9 °F | 70.5 °F | 2.34 in. |
| October | 28.0 °F | 58.9 °F | 1.08 in. |
| November | 18.1 °F | 48.0 °F | 0.84 in. |
| December | 10.3 °F | 39.7 °F | 0.72 in. |
| Annual | 27.7 °F | 57.6 °F | 22.57 in. |
| Average First Frost Date | Aug. 21 - Aug. 31 |
| Average Last Frost Date | May 21 - May 31 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 5a : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 5a : -20°F to -15°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |