Hill City, South Dakota has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from -1.1 °C (low) to 13.6 °C (high). Annual precipitation averages 573.5 Millimeters. Hill City is located in USDA Plant Hardiness Zone 4b. The growing season typically runs from the last frost around Jun. 1 - Jun. 10 through the first frost around Sep.1 - Sep. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -11.2 °C | 2.8 °C | 10.92 mm |
| February | -11.2 °C | 3.2 °C | 16 mm |
| March | -6.7 °C | 7.7 °C | 29.72 mm |
| April | -2.8 °C | 11.2 °C | 61.47 mm |
| May | 2.7 °C | 16.3 °C | 106.68 mm |
| June | 7.8 °C | 22.3 °C | 88.9 mm |
| July | 11.2 °C | 26.8 °C | 89.15 mm |
| August | 10 °C | 26.3 °C | 60.2 mm |
| September | 5.2 °C | 21.7 °C | 37.85 mm |
| October | -1.1 °C | 13.8 °C | 43.18 mm |
| November | -6.6 °C | 7.5 °C | 16.26 mm |
| December | -10.8 °C | 3 °C | 13.21 mm |
| Annual | -1.1 °C | 13.6 °C | 573.54 mm |
| Average First Frost Date | Sep.1 - Sep. 10 |
| Average Last Frost Date | Jun. 1 - Jun. 10 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 4b : -31.7°C to -28.9°C |
| Plant Hardiness Zone - 2012 | Zone 4a : -34.4°C to -31.7°C |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |