Westcliffe, Colorado has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from -3.3 °C (low) to 14.7 °C (high). Annual precipitation averages 341.9 Millimeters. Westcliffe is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around Jun. 1 - Jun. 10 through the first frost around Sep.1 - Sep. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -13.4 °C | 3.4 °C | 11.68 mm |
| February | -11.5 °C | 4.6 °C | 14.99 mm |
| March | -6.9 °C | 9.4 °C | 26.92 mm |
| April | -3.9 °C | 13.1 °C | 39.62 mm |
| May | 0.6 °C | 18.2 °C | 38.61 mm |
| June | 4.6 °C | 24.4 °C | 19.3 mm |
| July | 7.3 °C | 26.8 °C | 60.71 mm |
| August | 6.4 °C | 25.4 °C | 51.82 mm |
| September | 2.8 °C | 22.3 °C | 23.11 mm |
| October | -3.2 °C | 16.3 °C | 24.64 mm |
| November | -8.7 °C | 9 °C | 16.51 mm |
| December | -13.5 °C | 3.4 °C | 13.97 mm |
| Annual | -3.3 °C | 14.7 °C | 341.88 mm |
| Average First Frost Date | Sep.1 - Sep. 10 |
| Average Last Frost Date | Jun. 1 - Jun. 10 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 5a : -28.9°C to -26.1°C |
| Plant Hardiness Zone - 2012 | Zone 5a : -28.9°C to -26.1°C |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |