Blackhawk, South Dakota has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 1.6 °C (low) to 14.9 °C (high). Annual precipitation averages 505.2 Millimeters. 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 | -9.8 °C | 2.9 °C | 8.64 mm |
| February | -9.1 °C | 3.5 °C | 12.95 mm |
| March | -4.7 °C | 8.6 °C | 25.65 mm |
| April | -0.1 °C | 12.9 °C | 55.63 mm |
| May | 5.7 °C | 18 °C | 102.62 mm |
| June | 11.2 °C | 24.4 °C | 81.28 mm |
| July | 14.8 °C | 29 °C | 64.77 mm |
| August | 13.6 °C | 28.5 °C | 51.56 mm |
| September | 8.7 °C | 23.6 °C | 38.86 mm |
| October | 1.9 °C | 15.6 °C | 40.13 mm |
| November | -4 °C | 8.8 °C | 13.21 mm |
| December | -8.7 °C | 3.5 °C | 9.91 mm |
| Annual | 1.6 °C | 14.9 °C | 505.21 mm |
| 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 : -28.9°C to -26.1°C |
| Plant Hardiness Zone - 2012 | Zone 5a : -28.9°C to -26.1°C |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |