Brandywine, Maryland has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 46.8 °F (low) to 67.2 °F (high). Annual precipitation averages 45.4 Inches. Brandywine 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 | 26.5 °F | 44.5 °F | 3.1 in. |
| February | 28.0 °F | 47.6 °F | 2.79 in. |
| March | 34.7 °F | 55.9 °F | 3.92 in. |
| April | 44.7 °F | 67.6 °F | 3.29 in. |
| May | 54.2 °F | 76.1 °F | 4.28 in. |
| June | 63.4 °F | 84.2 °F | 4.38 in. |
| July | 68.2 °F | 88.3 °F | 4.32 in. |
| August | 66.5 °F | 86.7 °F | 3.89 in. |
| September | 59.9 °F | 80.2 °F | 4.33 in. |
| October | 47.9 °F | 68.7 °F | 3.96 in. |
| November | 37.5 °F | 57.9 °F | 3.31 in. |
| December | 30.6 °F | 48.3 °F | 3.84 in. |
| Annual | 46.8 °F | 67.2 °F | 45.41 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 |