Brush, Colorado has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 1.3 °C (low) to 18.3 °C (high). Annual precipitation averages 386.1 Millimeters. 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 | -10.8 °C | 5.2 °C | 7.37 mm |
| February | -9.2 °C | 7.2 °C | 8.38 mm |
| March | -4.2 °C | 13.1 °C | 17.02 mm |
| April | 0.1 °C | 17 °C | 38.86 mm |
| May | 6.1 °C | 22.2 °C | 68.58 mm |
| June | 11.7 °C | 28.9 °C | 56.64 mm |
| July | 15.1 °C | 32.4 °C | 64.01 mm |
| August | 13.5 °C | 31.2 °C | 49.28 mm |
| September | 8.4 °C | 26.8 °C | 29.72 mm |
| October | 0.6 °C | 19.1 °C | 27.69 mm |
| November | -5.6 °C | 11.1 °C | 10.67 mm |
| December | -10.6 °C | 5.2 °C | 7.87 mm |
| Annual | 1.3 °C | 18.3 °C | 386.09 mm |
| 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 : -26.1°C to -23.3°C |
| Plant Hardiness Zone - 2012 | Zone 5a : -28.9°C to -26.1°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |