Piedmont, Missouri has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 7.2 °C (low) to 20.3 °C (high). Annual precipitation averages 1208.5 Millimeters. Piedmont is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -4.9 °C | 6.6 °C | 79.5 mm |
| February | -3.3 °C | 9.6 °C | 82.04 mm |
| March | 1.4 °C | 14.9 °C | 100.84 mm |
| April | 6.9 °C | 21.4 °C | 147.07 mm |
| May | 12.4 °C | 25.6 °C | 130.3 mm |
| June | 17.2 °C | 30.1 °C | 100.58 mm |
| July | 19.6 °C | 32.1 °C | 97.03 mm |
| August | 18.4 °C | 31.7 °C | 83.31 mm |
| September | 13.9 °C | 27.7 °C | 97.54 mm |
| October | 6.9 °C | 21.4 °C | 86.61 mm |
| November | 1.2 °C | 14.3 °C | 113.54 mm |
| December | -3.1 °C | 8.2 °C | 90.17 mm |
| Annual | 7.2 °C | 20.3 °C | 1208.53 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 75-100 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 | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |