Walsh, Colorado has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 39.6 °F (low) to 69.3 °F (high). Annual precipitation averages 18.4 Inches. Walsh is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 19.0 °F | 47.7 °F | 0.41 in. |
| February | 21.1 °F | 50.6 °F | 0.38 in. |
| March | 28.6 °F | 59.9 °F | 0.97 in. |
| April | 36.6 °F | 67.4 °F | 1.53 in. |
| May | 47.1 °F | 77.3 °F | 2.11 in. |
| June | 57.8 °F | 88.0 °F | 2.44 in. |
| July | 63.0 °F | 92.3 °F | 3.15 in. |
| August | 61.4 °F | 89.6 °F | 3.35 in. |
| September | 52.9 °F | 82.8 °F | 1.37 in. |
| October | 39.4 °F | 70.4 °F | 1.58 in. |
| November | 28.2 °F | 57.9 °F | 0.54 in. |
| December | 20.0 °F | 47.6 °F | 0.58 in. |
| Annual | 39.6 °F | 69.3 °F | 18.41 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6b : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |