Sundance, Wyoming has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from -0.8 °C (low) to 13.4 °C (high). Annual precipitation averages 530.6 Millimeters. Sundance is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around May 21 - May 31 through the first frost around Sep.11 - Sep. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -11.7 °C | 1.1 °C | 22.35 mm |
| February | -11.3 °C | 1.9 °C | 22.35 mm |
| March | -6.6 °C | 7.3 °C | 27.43 mm |
| April | -2.3 °C | 11.5 °C | 62.48 mm |
| May | 3.1 °C | 16.8 °C | 84.07 mm |
| June | 8.3 °C | 23.2 °C | 85.34 mm |
| July | 11.8 °C | 28.1 °C | 62.23 mm |
| August | 10.9 °C | 27.6 °C | 41.4 mm |
| September | 5.9 °C | 22.1 °C | 33.53 mm |
| October | -0.7 °C | 13.6 °C | 45.47 mm |
| November | -6.4 °C | 6.5 °C | 24.64 mm |
| December | -10.9 °C | 1.6 °C | 19.3 mm |
| Annual | -0.8 °C | 13.4 °C | 530.59 mm |
| Average First Frost Date | Sep.11 - Sep. 20 |
| Average Last Frost Date | May 21 - May 31 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5a : -28.9°C to -26.1°C |
| Plant Hardiness Zone - 2012 | Zone 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |