Kemp Mill, Maryland has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 46.2 °F (low) to 65.9 °F (high). Annual precipitation averages 45.7 Inches. Kemp Mill 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 | 25.8 °F | 42.8 °F | 3.11 in. |
| February | 27.3 °F | 46.0 °F | 2.75 in. |
| March | 34.0 °F | 54.4 °F | 4.0 in. |
| April | 44.0 °F | 66.5 °F | 3.48 in. |
| May | 54.0 °F | 74.9 °F | 4.45 in. |
| June | 62.8 °F | 83.2 °F | 4.6 in. |
| July | 67.5 °F | 87.4 °F | 4.41 in. |
| August | 65.9 °F | 85.6 °F | 3.72 in. |
| September | 59.3 °F | 78.9 °F | 4.45 in. |
| October | 47.3 °F | 67.5 °F | 3.84 in. |
| November | 36.9 °F | 56.6 °F | 3.15 in. |
| December | 30.1 °F | 46.8 °F | 3.73 in. |
| Annual | 46.2 °F | 65.9 °F | 45.69 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 7a : 0°F to 5°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |