Hill City, South Dakota has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 30 °F (low) to 56.4 °F (high). Annual precipitation averages 22.6 Inches. 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 | 11.8 °F | 37.1 °F | 0.43 in. |
| February | 11.9 °F | 37.7 °F | 0.63 in. |
| March | 19.9 °F | 45.9 °F | 1.17 in. |
| April | 27.0 °F | 52.2 °F | 2.42 in. |
| May | 36.9 °F | 61.4 °F | 4.2 in. |
| June | 46.0 °F | 72.2 °F | 3.5 in. |
| July | 52.2 °F | 80.2 °F | 3.51 in. |
| August | 50.0 °F | 79.3 °F | 2.37 in. |
| September | 41.4 °F | 71.1 °F | 1.49 in. |
| October | 30.0 °F | 56.8 °F | 1.7 in. |
| November | 20.2 °F | 45.5 °F | 0.64 in. |
| December | 12.6 °F | 37.4 °F | 0.52 in. |
| Annual | 30 °F | 56.4 °F | 22.58 in. |
| 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 : -25°F to -20°F |
| Plant Hardiness Zone - 2012 | Zone 4a : -30°F to -25°F |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |