Bryantown, Maryland has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 47.1 °F (low) to 67.5 °F (high). Annual precipitation averages 45.9 Inches. Bryantown 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 | 27.0 °F | 45.1 °F | 3.11 in. |
| February | 28.6 °F | 48.7 °F | 2.79 in. |
| March | 35.1 °F | 56.9 °F | 3.93 in. |
| April | 45.0 °F | 68.4 °F | 3.28 in. |
| May | 54.5 °F | 76.2 °F | 4.25 in. |
| June | 63.4 °F | 84.0 °F | 4.36 in. |
| July | 68.2 °F | 88.1 °F | 4.36 in. |
| August | 66.5 °F | 86.4 °F | 4.23 in. |
| September | 60.1 °F | 80.1 °F | 4.44 in. |
| October | 48.2 °F | 69.1 °F | 4.01 in. |
| November | 38.0 °F | 58.4 °F | 3.28 in. |
| December | 31.1 °F | 49.1 °F | 3.83 in. |
| Annual | 47.1 °F | 67.5 °F | 45.87 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 |