Wessington Springs, South Dakota has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 2.1 °C (low) to 14.1 °C (high). Annual precipitation averages 619 Millimeters. Wessington Springs is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -13.2 °C | -2.8 °C | 14.99 mm |
| February | -11.1 °C | -0.1 °C | 16.76 mm |
| March | -5.2 °C | 6.6 °C | 30.48 mm |
| April | 1.1 °C | 13.8 °C | 75.69 mm |
| May | 8.1 °C | 20.4 °C | 91.69 mm |
| June | 14.2 °C | 26.3 °C | 99.06 mm |
| July | 17 °C | 29.8 °C | 70.1 mm |
| August | 15.8 °C | 28.9 °C | 70.61 mm |
| September | 10.8 °C | 24.2 °C | 60.71 mm |
| October | 3 °C | 15.6 °C | 51.56 mm |
| November | -4.5 °C | 6.8 °C | 20.83 mm |
| December | -10.4 °C | -0.7 °C | 16.51 mm |
| Annual | 2.1 °C | 14.1 °C | 618.99 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5a : -28.9°C to -26.1°C |
| Plant Hardiness Zone - 2012 | Zone 5a : -28.9°C to -26.1°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |