Cobb Island, Maryland has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 9.9 °C (low) to 20.2 °C (high). Annual precipitation averages 1135.6 Millimeters. 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 | -1.6 °C | 7.9 °C | 77.72 mm |
| February | -0.8 °C | 9.4 °C | 70.61 mm |
| March | 2.9 °C | 13.4 °C | 99.06 mm |
| April | 8.5 °C | 20.4 °C | 82.3 mm |
| May | 14.1 °C | 24.9 °C | 101.85 mm |
| June | 19 °C | 29.6 °C | 108.46 mm |
| July | 21.7 °C | 31.8 °C | 112.52 mm |
| August | 20.8 °C | 30.7 °C | 104.39 mm |
| September | 17.4 °C | 27.5 °C | 106.68 mm |
| October | 11.1 °C | 21.5 °C | 97.79 mm |
| November | 5.1 °C | 15.2 °C | 79.76 mm |
| December | 1.1 °C | 10.3 °C | 94.49 mm |
| Annual | 9.9 °C | 20.2 °C | 1135.63 mm |
| 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 : -12.2°C to -9.4°C |
| Plant Hardiness Zone - 2012 | Zone 7b : -15°C to -12.2°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |