| 2023 Hardiness Zone: | Zone 5a: -20°F to -15°F | |
| 2012 Hardiness Zone: | Zone 5a: -20°F to -15°F Zone 5b: -15°F to -10°F | |
| 1990 Hardiness Zone: | Zone 5a: -20F to -15F | |
| Average First Frost Date: | Sep. 21 - Sep. 30 | |
| 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: | 8 - 14 days Over 86°F |
Annual Climate Data for ZIP Code 57718 - Black Hawk, SD | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 10 | 14 | 21 | 31 | 41 | 51 | 56 | 54 | 44 | 33 | 21 | 13 | 32 |
| Avg Max Temp (°F) | 35 | 39 | 46 | 55 | 65 | 75 | 83 | 82 | 73 | 60 | 44 | 37 | 58 |
| Avg Precip (In.) | .37 | .47 | 1.06 | 2.13 | 3.49 | 3.22 | 2.67 | 2.03 | 1.28 | 1.57 | .6 | .41 | 19.3 |