Stonewall Gap, Colorado has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 29.6 °F (low) to 59.9 °F (high). Annual precipitation averages 19.8 Inches. Stonewall Gap is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 21 - May 31 through the first frost around Sep.1 - Sep. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 12.2 °F | 40.3 °F | 0.75 in. |
| February | 15.5 °F | 43.4 °F | 0.98 in. |
| March | 21.8 °F | 49.9 °F | 1.84 in. |
| April | 27.4 °F | 57.5 °F | 1.79 in. |
| May | 35.3 °F | 66.5 °F | 1.82 in. |
| June | 42.9 °F | 76.8 °F | 1.23 in. |
| July | 48.4 °F | 79.9 °F | 3.35 in. |
| August | 47.4 °F | 78.2 °F | 3.17 in. |
| September | 40.4 °F | 72.6 °F | 1.68 in. |
| October | 30.3 °F | 62.8 °F | 1.36 in. |
| November | 20.3 °F | 50.3 °F | 0.94 in. |
| December | 13.1 °F | 40.5 °F | 0.84 in. |
| Annual | 29.6 °F | 59.9 °F | 19.75 in. |
| Average First Frost Date | Sep.1 - Sep. 10 |
| Average Last Frost Date | May 21 - May 31 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Exceptional Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |