Sundance, Wyoming has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 30.5 °F (low) to 56.2 °F (high). Annual precipitation averages 20.9 Inches. 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 | 11.0 °F | 33.9 °F | 0.88 in. |
| February | 11.7 °F | 35.5 °F | 0.88 in. |
| March | 20.1 °F | 45.1 °F | 1.08 in. |
| April | 27.9 °F | 52.7 °F | 2.46 in. |
| May | 37.6 °F | 62.2 °F | 3.31 in. |
| June | 46.9 °F | 73.8 °F | 3.36 in. |
| July | 53.3 °F | 82.5 °F | 2.45 in. |
| August | 51.6 °F | 81.7 °F | 1.63 in. |
| September | 42.6 °F | 71.7 °F | 1.32 in. |
| October | 30.8 °F | 56.4 °F | 1.79 in. |
| November | 20.5 °F | 43.7 °F | 0.97 in. |
| December | 12.4 °F | 34.8 °F | 0.76 in. |
| Annual | 30.5 °F | 56.2 °F | 20.89 in. |
| 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 : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |