Tilghman Island, Maryland has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 51.5 °F (low) to 63.8 °F (high). Annual precipitation averages 46.1 Inches. Tilghman 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 | 30.7 °F | 42.2 °F | 3.27 in. |
| February | 31.1 °F | 43.7 °F | 2.84 in. |
| March | 37.5 °F | 51.1 °F | 4.14 in. |
| April | 47.9 °F | 62.7 °F | 3.39 in. |
| May | 57.8 °F | 71.4 °F | 4.14 in. |
| June | 67.6 °F | 79.9 °F | 4.2 in. |
| July | 73.0 °F | 84.8 °F | 4.49 in. |
| August | 71.7 °F | 83.0 °F | 4.41 in. |
| September | 65.7 °F | 77.2 °F | 4.19 in. |
| October | 54.5 °F | 66.5 °F | 4.06 in. |
| November | 44.2 °F | 55.7 °F | 3.21 in. |
| December | 35.9 °F | 46.8 °F | 3.73 in. |
| Annual | 51.5 °F | 63.8 °F | 46.07 in. |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 50-75 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 |