Whitehorse, South Dakota has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 33.6 °F (low) to 56.4 °F (high). Annual precipitation averages 18.1 Inches. Whitehorse is located in USDA Plant Hardiness Zone 4b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 5.2 °F | 24.2 °F | 0.4 in. |
| February | 8.6 °F | 28.9 °F | 0.55 in. |
| March | 19.8 °F | 42.0 °F | 0.83 in. |
| April | 31.5 °F | 56.8 °F | 1.62 in. |
| May | 44.1 °F | 68.4 °F | 2.8 in. |
| June | 55.1 °F | 78.7 °F | 3.28 in. |
| July | 60.9 °F | 85.9 °F | 2.69 in. |
| August | 58.6 °F | 84.5 °F | 1.9 in. |
| September | 49.2 °F | 75.6 °F | 1.47 in. |
| October | 35.8 °F | 59.1 °F | 1.58 in. |
| November | 22.8 °F | 42.9 °F | 0.48 in. |
| December | 11.5 °F | 29.5 °F | 0.49 in. |
| Annual | 33.6 °F | 56.4 °F | 18.09 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 4b : -25°F to -20°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |