Summerset, South Dakota has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 34.2 °F (low) to 58.7 °F (high). Annual precipitation averages 20.7 Inches. 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 | 13.7 °F | 37.1 °F | 0.39 in. |
| February | 15.1 °F | 38.2 °F | 0.57 in. |
| March | 22.7 °F | 47.2 °F | 1.09 in. |
| April | 31.0 °F | 55.1 °F | 2.29 in. |
| May | 41.5 °F | 64.2 °F | 4.09 in. |
| June | 51.4 °F | 75.7 °F | 3.34 in. |
| July | 57.8 °F | 83.9 °F | 2.62 in. |
| August | 55.6 °F | 83.0 °F | 2.08 in. |
| September | 46.9 °F | 74.2 °F | 1.52 in. |
| October | 34.8 °F | 59.8 °F | 1.65 in. |
| November | 23.8 °F | 47.6 °F | 0.58 in. |
| December | 16.0 °F | 38.3 °F | 0.44 in. |
| Annual | 34.2 °F | 58.7 °F | 20.66 in. |
| 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 : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 5a : -20°F to -15°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |