Cobb Island, Maryland has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 49.9 °F (low) to 68.4 °F (high). Annual precipitation averages 44.7 Inches. Cobb Island is located in USDA Plant Hardiness Zone 8a. 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 | 29.1 °F | 46.2 °F | 3.06 in. |
| February | 30.6 °F | 48.9 °F | 2.78 in. |
| March | 37.3 °F | 56.2 °F | 3.9 in. |
| April | 47.3 °F | 68.7 °F | 3.24 in. |
| May | 57.4 °F | 76.8 °F | 4.01 in. |
| June | 66.2 °F | 85.2 °F | 4.27 in. |
| July | 71.0 °F | 89.2 °F | 4.43 in. |
| August | 69.4 °F | 87.3 °F | 4.11 in. |
| September | 63.3 °F | 81.5 °F | 4.2 in. |
| October | 51.9 °F | 70.7 °F | 3.85 in. |
| November | 41.1 °F | 59.3 °F | 3.14 in. |
| December | 34.0 °F | 50.6 °F | 3.72 in. |
| Annual | 49.9 °F | 68.4 °F | 44.71 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 8a : 10°F to 15°F |
| Plant Hardiness Zone - 2012 | Zone 7b : 5°F to 10°F |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |