White Horse, South Dakota has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 35.1 °F (low) to 59.8 °F (high). Annual precipitation averages 21.6 Inches. White Horse is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 12.0 °F | 34.1 °F | 0.44 in. |
| February | 14.5 °F | 37.6 °F | 0.61 in. |
| March | 23.1 °F | 47.9 °F | 1.1 in. |
| April | 32.6 °F | 57.2 °F | 2.48 in. |
| May | 43.8 °F | 68.0 °F | 3.44 in. |
| June | 54.7 °F | 79.0 °F | 3.86 in. |
| July | 60.6 °F | 86.9 °F | 2.83 in. |
| August | 58.5 °F | 85.5 °F | 1.97 in. |
| September | 48.6 °F | 76.8 °F | 1.91 in. |
| October | 35.0 °F | 61.3 °F | 1.74 in. |
| November | 23.4 °F | 47.5 °F | 0.7 in. |
| December | 14.6 °F | 36.2 °F | 0.48 in. |
| Annual | 35.1 °F | 59.8 °F | 21.56 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5a : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |