Potomac Mills, Virginia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 8 °C (low) to 19.4 °C (high). Annual precipitation averages 1125.5 Millimeters. Potomac Mills is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -3.4 °C | 6.6 °C | 76.71 mm |
| February | -2.5 °C | 8.6 °C | 67.31 mm |
| March | 1.2 °C | 13.3 °C | 95.76 mm |
| April | 6.8 °C | 19.8 °C | 83.57 mm |
| May | 12.3 °C | 24.2 °C | 107.44 mm |
| June | 17.3 °C | 28.8 °C | 108.97 mm |
| July | 20.1 °C | 31.2 °C | 113.03 mm |
| August | 19 °C | 30.2 °C | 91.19 mm |
| September | 15.3 °C | 26.4 °C | 109.73 mm |
| October | 8.4 °C | 20.1 °C | 95.25 mm |
| November | 2.4 °C | 14.1 °C | 85.09 mm |
| December | -1.1 °C | 8.9 °C | 91.44 mm |
| Annual | 8 °C | 19.4 °C | 1125.49 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 75-100 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 | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |