Elkton, South Dakota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 33.8 °F (low) to 53.9 °F (high). Annual precipitation averages 27.3 Inches. Elkton is located in USDA Plant Hardiness Zone 4b. 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 | 5.0 °F | 22.7 °F | 0.63 in. |
| February | 8.8 °F | 27.3 °F | 0.74 in. |
| March | 20.5 °F | 39.4 °F | 1.38 in. |
| April | 32.6 °F | 54.2 °F | 2.64 in. |
| May | 45.6 °F | 67.0 °F | 3.71 in. |
| June | 56.6 °F | 76.9 °F | 4.4 in. |
| July | 60.6 °F | 81.5 °F | 3.45 in. |
| August | 57.9 °F | 79.1 °F | 3.16 in. |
| September | 49.3 °F | 72.1 °F | 3.1 in. |
| October | 35.8 °F | 57.9 °F | 2.17 in. |
| November | 22.5 °F | 41.5 °F | 1.02 in. |
| December | 10.9 °F | 27.6 °F | 0.88 in. |
| Annual | 33.8 °F | 53.9 °F | 27.28 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 4b : -25°F to -20°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |