Brandywine, West Virginia has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 40.1 °F (low) to 64.7 °F (high). Annual precipitation averages 35.5 Inches. Brandywine is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 21.1 °F | 42.1 °F | 2.19 in. |
| February | 22.8 °F | 45.2 °F | 1.77 in. |
| March | 29.1 °F | 53.0 °F | 2.96 in. |
| April | 38.0 °F | 65.3 °F | 3.08 in. |
| May | 47.5 °F | 73.6 °F | 4.05 in. |
| June | 56.1 °F | 81.3 °F | 3.29 in. |
| July | 60.0 °F | 84.9 °F | 4.03 in. |
| August | 58.6 °F | 83.6 °F | 3.63 in. |
| September | 52.0 °F | 78.1 °F | 3.45 in. |
| October | 40.6 °F | 67.3 °F | 2.27 in. |
| November | 30.7 °F | 55.6 °F | 2.45 in. |
| December | 25.1 °F | 45.9 °F | 2.33 in. |
| Annual | 40.1 °F | 64.7 °F | 35.5 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 7a : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |