Blackhawk, South Dakota has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 34.9 °F (low) to 58.9 °F (high). Annual precipitation averages 19.9 Inches. Blackhawk is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 14.4 °F | 37.2 °F | 0.34 in. |
| February | 15.7 °F | 38.3 °F | 0.51 in. |
| March | 23.5 °F | 47.5 °F | 1.01 in. |
| April | 31.8 °F | 55.2 °F | 2.19 in. |
| May | 42.2 °F | 64.4 °F | 4.04 in. |
| June | 52.1 °F | 76.0 °F | 3.2 in. |
| July | 58.6 °F | 84.2 °F | 2.55 in. |
| August | 56.4 °F | 83.3 °F | 2.03 in. |
| September | 47.7 °F | 74.5 °F | 1.53 in. |
| October | 35.5 °F | 60.0 °F | 1.58 in. |
| November | 24.8 °F | 47.8 °F | 0.52 in. |
| December | 16.4 °F | 38.3 °F | 0.39 in. |
| Annual | 34.9 °F | 58.9 °F | 19.89 in. |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5a : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 5a : -20°F to -15°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |