Crumpton, Maryland has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 45.7 °F (low) to 65.6 °F (high). Annual precipitation averages 46.5 Inches. Crumpton 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 | 25.2 °F | 42.6 °F | 3.26 in. |
| February | 26.1 °F | 44.8 °F | 2.9 in. |
| March | 33.4 °F | 52.8 °F | 4.15 in. |
| April | 43.6 °F | 65.2 °F | 3.58 in. |
| May | 53.2 °F | 74.2 °F | 3.96 in. |
| June | 62.3 °F | 83.0 °F | 4.81 in. |
| July | 67.3 °F | 87.3 °F | 4.43 in. |
| August | 65.3 °F | 85.6 °F | 4.14 in. |
| September | 58.6 °F | 79.6 °F | 4.38 in. |
| October | 46.7 °F | 68.3 °F | 3.96 in. |
| November | 36.7 °F | 56.9 °F | 3.05 in. |
| December | 29.9 °F | 47.1 °F | 3.86 in. |
| Annual | 45.7 °F | 65.6 °F | 46.48 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 | Extreme Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |