Estelline, South Dakota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 33.1 °F (low) to 53.8 °F (high). Annual precipitation averages 25.9 Inches. Estelline 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 Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 3.7 °F | 22.2 °F | 0.6 in. |
| February | 7.5 °F | 26.9 °F | 0.63 in. |
| March | 19.5 °F | 38.8 °F | 1.24 in. |
| April | 31.8 °F | 54.0 °F | 2.48 in. |
| May | 44.9 °F | 66.8 °F | 3.36 in. |
| June | 55.8 °F | 76.9 °F | 4.21 in. |
| July | 60.2 °F | 81.9 °F | 3.48 in. |
| August | 57.5 °F | 79.7 °F | 3.05 in. |
| September | 48.8 °F | 72.2 °F | 2.89 in. |
| October | 35.1 °F | 57.7 °F | 2.21 in. |
| November | 22.0 °F | 41.3 °F | 0.96 in. |
| December | 10.1 °F | 27.4 °F | 0.78 in. |
| Annual | 33.1 °F | 53.8 °F | 25.89 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 4b : -25°F to -20°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |