Penrose, Colorado has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 2.5 °C (low) to 19.1 °C (high). Annual precipitation averages 289.8 Millimeters. Penrose is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -7.5 °C | 8.6 °C | 9.91 mm |
| February | -7 °C | 9 °C | 8.89 mm |
| March | -3.1 °C | 13.9 °C | 16.76 mm |
| April | 0.9 °C | 17.6 °C | 38.35 mm |
| May | 6.3 °C | 22.6 °C | 37.59 mm |
| June | 11.4 °C | 28.8 °C | 23.62 mm |
| July | 14.7 °C | 31.3 °C | 48.01 mm |
| August | 13.7 °C | 29.9 °C | 53.34 mm |
| September | 9 °C | 26.4 °C | 20.83 mm |
| October | 2.1 °C | 19.8 °C | 13.46 mm |
| November | -3.1 °C | 13.1 °C | 10.16 mm |
| December | -7.2 °C | 8.3 °C | 8.89 mm |
| Annual | 2.5 °C | 19.1 °C | 289.81 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |