Wessington, South Dakota has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 34 °F (low) to 56.7 °F (high). Annual precipitation averages 23.4 Inches. Wessington 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 | 5.4 °F | 25.1 °F | 0.57 in. |
| February | 9.4 °F | 30.5 °F | 0.64 in. |
| March | 20.8 °F | 42.7 °F | 1.06 in. |
| April | 32.6 °F | 56.9 °F | 2.52 in. |
| May | 45.4 °F | 69.0 °F | 3.41 in. |
| June | 56.3 °F | 79.0 °F | 3.92 in. |
| July | 61.2 °F | 85.2 °F | 2.94 in. |
| August | 58.6 °F | 83.4 °F | 2.6 in. |
| September | 49.3 °F | 75.2 °F | 2.2 in. |
| October | 35.4 °F | 59.9 °F | 2.08 in. |
| November | 22.1 °F | 43.8 °F | 0.77 in. |
| December | 11.0 °F | 30.0 °F | 0.65 in. |
| Annual | 34 °F | 56.7 °F | 23.36 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 | Dfa - Humid Continental Hot Summers With Year Around Precipitation |