| 2023 Hardiness Zone: | Zone 5a: -20°F to -15°F Zone 5b: -15°F to -10°F Zone 4b: -25°F to -20°F Zone 4a: -30°F to -25°F | |
| 2012 Hardiness Zone: | Zone 5a: -20°F to -15°F Zone 5b: -15°F to -10°F Zone 4b: -25°F to -20°F Zone 4a: -30°F to -25°F | |
| 1990 Hardiness Zone: | Zone 4a: -30F to -25F | |
| Average First Frost Date: | Sep.11 - Sep. 20 | |
| Average Last Frost Date: | Jun. 1 - Jun. 10 | |
| Koppen-Geiger Climate Zone: | BSk - Cold Semi-Arid Climate | |
| Ecoregion: | 17a - Black Hills Plateau | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 82729 - Sundance, WY | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 9 | 13 | 20 | 28 | 38 | 47 | 53 | 52 | 42 | 32 | 20 | 12 | 31 |
| Avg Max Temp (°F) | 31 | 36 | 43 | 53 | 62 | 73 | 80 | 79 | 69 | 56 | 40 | 32 | 55 |
| Avg Precip (In.) | .81 | .69 | 1.11 | 2.35 | 2.79 | 3.09 | 2.12 | 1.67 | 1.35 | 1.62 | 1.02 | .74 | 19.36 |