Summerset, South Dakota has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 1.2 °C (low) to 14.8 °C (high). Annual precipitation averages 524.8 Millimeters. Summerset 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 Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -10.2 °C | 2.8 °C | 9.91 mm |
| February | -9.4 °C | 3.4 °C | 14.48 mm |
| March | -5.2 °C | 8.4 °C | 27.69 mm |
| April | -0.6 °C | 12.8 °C | 58.17 mm |
| May | 5.3 °C | 17.9 °C | 103.89 mm |
| June | 10.8 °C | 24.3 °C | 84.84 mm |
| July | 14.3 °C | 28.8 °C | 66.55 mm |
| August | 13.1 °C | 28.3 °C | 52.83 mm |
| September | 8.3 °C | 23.4 °C | 38.61 mm |
| October | 1.6 °C | 15.4 °C | 41.91 mm |
| November | -4.6 °C | 8.7 °C | 14.73 mm |
| December | -8.9 °C | 3.5 °C | 11.18 mm |
| Annual | 1.2 °C | 14.8 °C | 524.79 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 5a : -28.9°C to -26.1°C |
| Plant Hardiness Zone - 2012 | Zone 5a : -28.9°C to -26.1°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |