Summit, South Dakota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 31.6 °F (low) to 52.7 °F (high). Annual precipitation averages 25.5 Inches. Summit is located in USDA Plant Hardiness Zone 4a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 1.9 °F | 19.6 °F | 0.66 in. |
| February | 5.9 °F | 24.8 °F | 0.66 in. |
| March | 17.7 °F | 37.5 °F | 1.11 in. |
| April | 30.3 °F | 53.5 °F | 2.25 in. |
| May | 42.9 °F | 66.7 °F | 3.1 in. |
| June | 53.7 °F | 76.1 °F | 3.94 in. |
| July | 58.1 °F | 81.2 °F | 4.13 in. |
| August | 56.4 °F | 79.8 °F | 2.84 in. |
| September | 48.0 °F | 72.2 °F | 2.77 in. |
| October | 34.8 °F | 57.1 °F | 2.51 in. |
| November | 20.9 °F | 39.3 °F | 0.89 in. |
| December | 8.8 °F | 25.1 °F | 0.68 in. |
| Annual | 31.6 °F | 52.7 °F | 25.54 in. |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 4a : -30°F to -25°F |
| Plant Hardiness Zone - 2012 | Zone 4a : -30°F to -25°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |