Powellville, Maryland has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 46.7 °F (low) to 67.6 °F (high). Annual precipitation averages 47.1 Inches. Powellville is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 27.2 °F | 46.3 °F | 3.51 in. |
| February | 28.2 °F | 48.7 °F | 3.09 in. |
| March | 34.6 °F | 55.7 °F | 4.24 in. |
| April | 44.1 °F | 66.7 °F | 3.45 in. |
| May | 53.4 °F | 75.1 °F | 3.58 in. |
| June | 62.8 °F | 83.4 °F | 3.97 in. |
| July | 67.8 °F | 88.0 °F | 4.24 in. |
| August | 65.6 °F | 85.9 °F | 4.92 in. |
| September | 59.7 °F | 80.7 °F | 4.71 in. |
| October | 47.9 °F | 70.4 °F | 4.14 in. |
| November | 37.7 °F | 59.6 °F | 3.32 in. |
| December | 31.3 °F | 50.7 °F | 3.96 in. |
| Annual | 46.7 °F | 67.6 °F | 47.13 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7b : 5°F to 10°F |
| Plant Hardiness Zone - 2012 | Zone 7b : 5°F to 10°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |