Whitehorse, South Dakota has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 0.9 °C (low) to 13.6 °C (high). Annual precipitation averages 459.5 Millimeters. 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 | -14.9 °C | -4.3 °C | 10.16 mm |
| February | -13 °C | -1.7 °C | 13.97 mm |
| March | -6.8 °C | 5.6 °C | 21.08 mm |
| April | -0.3 °C | 13.8 °C | 41.15 mm |
| May | 6.7 °C | 20.2 °C | 71.12 mm |
| June | 12.8 °C | 25.9 °C | 83.31 mm |
| July | 16.1 °C | 29.9 °C | 68.33 mm |
| August | 14.8 °C | 29.2 °C | 48.26 mm |
| September | 9.6 °C | 24.2 °C | 37.34 mm |
| October | 2.1 °C | 15.1 °C | 40.13 mm |
| November | -5.1 °C | 6.1 °C | 12.19 mm |
| December | -11.4 °C | -1.4 °C | 12.45 mm |
| Annual | 0.9 °C | 13.6 °C | 459.49 mm |
| 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 : -31.7°C to -28.9°C |
| Plant Hardiness Zone - 2012 | Zone 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |