Butler, South Dakota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 0.6 °C (low) to 11.5 °C (high). Annual precipitation averages 610.4 Millimeters. Butler 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 | -16.3 °C | -6.4 °C | 17.27 mm |
| February | -14.2 °C | -3.7 °C | 16 mm |
| March | -7.6 °C | 3.1 °C | 27.18 mm |
| April | -0.2 °C | 11.7 °C | 55.12 mm |
| May | 7.2 °C | 18.9 °C | 78.74 mm |
| June | 13.3 °C | 24.3 °C | 98.55 mm |
| July | 16 °C | 27.1 °C | 93.22 mm |
| August | 14.8 °C | 26.3 °C | 64.77 mm |
| September | 9.9 °C | 21.9 °C | 63.5 mm |
| October | 2.2 °C | 13.4 °C | 57.66 mm |
| November | -5.6 °C | 4.2 °C | 19.81 mm |
| December | -12.3 °C | -3.3 °C | 18.54 mm |
| Annual | 0.6 °C | 11.5 °C | 610.36 mm |
| 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 : -31.7°C to -28.9°C |
| Plant Hardiness Zone - 2012 | Zone 4a : -34.4°C to -31.7°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |