Wilmot, South Dakota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 0.6 °C (low) to 12.1 °C (high). Annual precipitation averages 626.6 Millimeters. Wilmot 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 | -15.9 °C | -5.8 °C | 19.3 mm |
| February | -14.1 °C | -3.4 °C | 18.8 mm |
| March | -7.2 °C | 3.6 °C | 31.24 mm |
| April | -0.1 °C | 12.3 °C | 61.21 mm |
| May | 7.3 °C | 19.8 °C | 72.39 mm |
| June | 13.4 °C | 25.3 °C | 92.2 mm |
| July | 15.7 °C | 27.8 °C | 100.08 mm |
| August | 14.3 °C | 26.8 °C | 68.83 mm |
| September | 9.2 °C | 22.6 °C | 57.66 mm |
| October | 1.9 °C | 14.1 °C | 61.98 mm |
| November | -5.4 °C | 5.2 °C | 23.37 mm |
| December | -12.2 °C | -2.7 °C | 19.56 mm |
| Annual | 0.6 °C | 12.1 °C | 626.62 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 | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |