Piedmont, South Dakota has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 1.4 °C (low) to 15 °C (high). Annual precipitation averages 527.8 Millimeters. Piedmont 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 | -10.1 °C | 2.8 °C | 10.41 mm |
| February | -9.3 °C | 3.4 °C | 15.24 mm |
| March | -4.9 °C | 8.6 °C | 28.45 mm |
| April | -0.3 °C | 13.1 °C | 58.93 mm |
| May | 5.6 °C | 18.1 °C | 104.39 mm |
| June | 11.1 °C | 24.4 °C | 85.85 mm |
| July | 14.7 °C | 29.1 °C | 64.01 mm |
| August | 13.5 °C | 28.6 °C | 50.8 mm |
| September | 8.5 °C | 23.8 °C | 37.85 mm |
| October | 1.7 °C | 15.6 °C | 43.43 mm |
| November | -4.3 °C | 8.7 °C | 16 mm |
| December | -9 °C | 3.4 °C | 12.45 mm |
| Annual | 1.4 °C | 15 °C | 527.81 mm |
| 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 : -28.9°C to -26.1°C |
| Plant Hardiness Zone - 2012 | Zone 5a : -28.9°C to -26.1°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |