Piedmont, West Virginia has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 5.1 °C (low) to 17.8 °C (high). Annual precipitation averages 1042.2 Millimeters. Piedmont is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -5.5 °C | 4.1 °C | 70.87 mm |
| February | -4.8 °C | 6.1 °C | 71.12 mm |
| March | -1.2 °C | 10.9 °C | 93.22 mm |
| April | 3.8 °C | 18.7 °C | 91.69 mm |
| May | 9 °C | 23.4 °C | 111.51 mm |
| June | 14 °C | 27.6 °C | 106.17 mm |
| July | 16.4 °C | 29.9 °C | 101.6 mm |
| August | 15.6 °C | 29.3 °C | 90.17 mm |
| September | 11.7 °C | 25.7 °C | 94.23 mm |
| October | 5.6 °C | 19.1 °C | 74.68 mm |
| November | 0.2 °C | 12.1 °C | 62.74 mm |
| December | -3.3 °C | 6.2 °C | 74.17 mm |
| Annual | 5.1 °C | 17.8 °C | 1042.17 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |