Mansfield, South Dakota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Annual precipitation averages 571.7 Millimeters. Mansfield is located in USDA Plant Hardiness Zone 4a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -16.7 °C | -5.6 °C | 12.95 mm |
| February | -14.1 °C | -2.3 °C | 15.75 mm |
| March | -7.3 °C | 4.6 °C | 24.13 mm |
| April | -0.4 °C | 13.2 °C | 54.1 mm |
| May | 6.9 °C | 20.3 °C | 84.07 mm |
| June | 13 °C | 25.7 °C | 93.47 mm |
| July | 15.6 °C | 28.5 °C | 84.07 mm |
| August | 13.9 °C | 27.8 °C | 60.71 mm |
| September | 8.4 °C | 23.3 °C | 53.59 mm |
| October | 1 °C | 15.1 °C | 53.85 mm |
| November | -6.7 °C | 5.3 °C | 19.05 mm |
| December | -13.3 °C | -2.7 °C | 16 mm |
| Annual | 0 °C | 12.8 °C | 571.74 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 4a : -34.4°C to -31.7°C |
| Plant Hardiness Zone - 2012 | Zone 4a : -34.4°C to -31.7°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |