Clifton, Colorado has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 4.9 °C (low) to 19.1 °C (high). Annual precipitation averages 238.8 Millimeters. Clifton is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -7 °C | 3.9 °C | 16.76 mm |
| February | -3.8 °C | 8.2 °C | 13.97 mm |
| March | 0.3 °C | 14.6 °C | 19.05 mm |
| April | 3.8 °C | 18.5 °C | 24.38 mm |
| May | 8.9 °C | 24.2 °C | 21.59 mm |
| June | 14 °C | 30.9 °C | 12.19 mm |
| July | 17.6 °C | 33.8 °C | 17.02 mm |
| August | 16.5 °C | 32.3 °C | 22.35 mm |
| September | 11.6 °C | 27.6 °C | 30.23 mm |
| October | 4.7 °C | 19.7 °C | 29.72 mm |
| November | -1.6 °C | 11.4 °C | 15.49 mm |
| December | -6.7 °C | 4.2 °C | 16 mm |
| Annual | 4.9 °C | 19.1 °C | 238.75 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 7a : -17.8°C to -15°C |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |