Potomac Mills, Virginia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 46.4 °F (low) to 66.8 °F (high). Annual precipitation averages 44.3 Inches. 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 | 25.9 °F | 43.9 °F | 3.02 in. |
| February | 27.5 °F | 47.5 °F | 2.65 in. |
| March | 34.2 °F | 55.9 °F | 3.77 in. |
| April | 44.3 °F | 67.6 °F | 3.29 in. |
| May | 54.1 °F | 75.5 °F | 4.23 in. |
| June | 63.1 °F | 83.8 °F | 4.29 in. |
| July | 68.1 °F | 88.2 °F | 4.45 in. |
| August | 66.2 °F | 86.3 °F | 3.59 in. |
| September | 59.6 °F | 79.6 °F | 4.32 in. |
| October | 47.2 °F | 68.2 °F | 3.75 in. |
| November | 36.4 °F | 57.4 °F | 3.35 in. |
| December | 30.0 °F | 48.0 °F | 3.6 in. |
| Annual | 46.4 °F | 66.8 °F | 44.31 in. |
| 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 : 5°F to 10°F |
| Plant Hardiness Zone - 2012 | Zone 7a : 0°F to 5°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |