Cheyenne, Wyoming has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 0.5 °C (low) to 15.1 °C (high). Annual precipitation averages 407.4 Millimeters. Cheyenne is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -8.5 °C | 4.4 °C | 8.89 mm |
| February | -8.6 °C | 4.7 °C | 11.18 mm |
| March | -4.8 °C | 9.3 °C | 23.88 mm |
| April | -1.6 °C | 12.6 °C | 42.16 mm |
| May | 3.8 °C | 17.7 °C | 68.07 mm |
| June | 8.8 °C | 24.5 °C | 59.69 mm |
| July | 12.4 °C | 28.6 °C | 52.32 mm |
| August | 11.4 °C | 27.6 °C | 48.77 mm |
| September | 6.7 °C | 23 °C | 39.12 mm |
| October | 0.3 °C | 15.4 °C | 27.69 mm |
| November | -5 °C | 8.7 °C | 15.24 mm |
| December | -8.6 °C | 4.1 °C | 10.41 mm |
| Annual | 0.5 °C | 15.1 °C | 407.42 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5b : -26.1°C to -23.3°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |