Plankinton, South Dakota has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 35.5 °F (low) to 58.3 °F (high). Annual precipitation averages 23.9 Inches. Plankinton is located in USDA Plant Hardiness Zone 5a. 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 | 8.3 °F | 28.0 °F | 0.49 in. |
| February | 12.2 °F | 33.2 °F | 0.7 in. |
| March | 22.6 °F | 45.1 °F | 1.1 in. |
| April | 34.0 °F | 58.2 °F | 2.83 in. |
| May | 46.4 °F | 69.7 °F | 3.55 in. |
| June | 57.5 °F | 80.1 °F | 3.75 in. |
| July | 62.2 °F | 86.4 °F | 2.91 in. |
| August | 60.0 °F | 84.4 °F | 2.7 in. |
| September | 50.5 °F | 76.4 °F | 2.48 in. |
| October | 36.7 °F | 61.3 °F | 1.98 in. |
| November | 23.3 °F | 45.3 °F | 0.81 in. |
| December | 12.8 °F | 31.8 °F | 0.61 in. |
| Annual | 35.5 °F | 58.3 °F | 23.91 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 5a : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |