Tilghman Island, Maryland has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 10.8 °C (low) to 17.6 °C (high). Annual precipitation averages 1170.2 Millimeters. 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 | -0.7 °C | 5.7 °C | 83.06 mm |
| February | -0.5 °C | 6.5 °C | 72.14 mm |
| March | 3.1 °C | 10.6 °C | 105.16 mm |
| April | 8.8 °C | 17.1 °C | 86.11 mm |
| May | 14.3 °C | 21.9 °C | 105.16 mm |
| June | 19.8 °C | 26.6 °C | 106.68 mm |
| July | 22.8 °C | 29.3 °C | 114.05 mm |
| August | 22.1 °C | 28.3 °C | 112.01 mm |
| September | 18.7 °C | 25.1 °C | 106.43 mm |
| October | 12.5 °C | 19.2 °C | 103.12 mm |
| November | 6.8 °C | 13.2 °C | 81.53 mm |
| December | 2.2 °C | 8.2 °C | 94.74 mm |
| Annual | 10.8 °C | 17.6 °C | 1170.19 mm |
| 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 : -12.2°C to -9.4°C |
| Plant Hardiness Zone - 2012 | Zone 7b : -15°C to -12.2°C |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |