Brush, Colorado has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 34.3 °F (low) to 64.9 °F (high). Annual precipitation averages 15.2 Inches. Brush 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 | 12.6 °F | 41.3 °F | 0.29 in. |
| February | 15.5 °F | 44.9 °F | 0.33 in. |
| March | 24.4 °F | 55.6 °F | 0.67 in. |
| April | 32.2 °F | 62.6 °F | 1.53 in. |
| May | 43.0 °F | 72.0 °F | 2.7 in. |
| June | 53.1 °F | 84.1 °F | 2.23 in. |
| July | 59.1 °F | 90.4 °F | 2.52 in. |
| August | 56.3 °F | 88.2 °F | 1.94 in. |
| September | 47.1 °F | 80.2 °F | 1.17 in. |
| October | 33.1 °F | 66.3 °F | 1.09 in. |
| November | 21.9 °F | 52.0 °F | 0.42 in. |
| December | 13.0 °F | 41.4 °F | 0.31 in. |
| Annual | 34.3 °F | 64.9 °F | 15.2 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 5a : -20°F to -15°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |