White Horse, South Dakota has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 1.7 °C (low) to 15.5 °C (high). Annual precipitation averages 547.6 Millimeters. 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 | -11.1 °C | 1.2 °C | 11.18 mm |
| February | -9.7 °C | 3.1 °C | 15.49 mm |
| March | -4.9 °C | 8.8 °C | 27.94 mm |
| April | 0.3 °C | 14 °C | 62.99 mm |
| May | 6.6 °C | 20 °C | 87.38 mm |
| June | 12.6 °C | 26.1 °C | 98.04 mm |
| July | 15.9 °C | 30.5 °C | 71.88 mm |
| August | 14.7 °C | 29.7 °C | 50.04 mm |
| September | 9.2 °C | 24.9 °C | 48.51 mm |
| October | 1.7 °C | 16.3 °C | 44.2 mm |
| November | -4.8 °C | 8.6 °C | 17.78 mm |
| December | -9.7 °C | 2.3 °C | 12.19 mm |
| Annual | 1.7 °C | 15.5 °C | 547.62 mm |
| 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 : -28.9°C to -26.1°C |
| Plant Hardiness Zone - 2012 | Zone 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |