Brock Hall, Maryland has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 46.9 °F (low) to 66.7 °F (high). Annual precipitation averages 45.9 Inches. Brock Hall 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 | 26.4 °F | 43.9 °F | 3.04 in. |
| February | 27.8 °F | 47.0 °F | 2.66 in. |
| March | 34.7 °F | 55.0 °F | 3.99 in. |
| April | 44.9 °F | 66.9 °F | 3.42 in. |
| May | 54.5 °F | 75.1 °F | 4.29 in. |
| June | 63.7 °F | 83.8 °F | 4.66 in. |
| July | 68.4 °F | 88.3 °F | 4.57 in. |
| August | 66.7 °F | 86.8 °F | 3.95 in. |
| September | 60.0 °F | 80.2 °F | 4.55 in. |
| October | 47.7 °F | 68.6 °F | 3.94 in. |
| November | 37.5 °F | 57.5 °F | 3.15 in. |
| December | 30.7 °F | 47.8 °F | 3.66 in. |
| Annual | 46.9 °F | 66.7 °F | 45.88 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 |