Montrose, Colorado has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 1.5 °C (low) to 17.6 °C (high). Annual precipitation averages 261.6 Millimeters. Montrose is located in USDA Plant Hardiness Zone 6b. 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 | -9.4 °C | 3.8 °C | 17.27 mm |
| February | -6.6 °C | 7.1 °C | 16.76 mm |
| March | -2.7 °C | 12.9 °C | 17.53 mm |
| April | 0.5 °C | 16.9 °C | 23.37 mm |
| May | 5.2 °C | 22.2 °C | 22.86 mm |
| June | 9.9 °C | 29.1 °C | 12.19 mm |
| July | 13.3 °C | 31.4 °C | 25.4 mm |
| August | 12.2 °C | 29.7 °C | 29.97 mm |
| September | 7.7 °C | 25.6 °C | 34.54 mm |
| October | 1.4 °C | 18.4 °C | 26.92 mm |
| November | -4.3 °C | 10.8 °C | 17.53 mm |
| December | -9.3 °C | 3.8 °C | 17.27 mm |
| Annual | 1.5 °C | 17.6 °C | 261.61 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 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |