Piedmont, Oklahoma has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 9.4 °C (low) to 22 °C (high). Annual precipitation averages 871.2 Millimeters. Piedmont is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -3.1 °C | 9.6 °C | 28.96 mm |
| February | -1.1 °C | 11.8 °C | 36.32 mm |
| March | 3.6 °C | 16.9 °C | 63.75 mm |
| April | 8.5 °C | 21.7 °C | 90.17 mm |
| May | 14.4 °C | 26.4 °C | 126.75 mm |
| June | 19.6 °C | 31.2 °C | 119.63 mm |
| July | 21.9 °C | 33.9 °C | 77.98 mm |
| August | 21 °C | 33.5 °C | 84.07 mm |
| September | 16.6 °C | 29.2 °C | 78.99 mm |
| October | 9.7 °C | 23 °C | 76.96 mm |
| November | 3.3 °C | 16 °C | 46.74 mm |
| December | -1.7 °C | 10.2 °C | 40.89 mm |
| Annual | 9.4 °C | 22 °C | 871.21 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 7b : -15°C to -12.2°C |
| Plant Hardiness Zone - 2012 | Zone 7a : -17.8°C to -15°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |