Fenwick Island, Delaware has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 49.9 °F (low) to 64 °F (high). Annual precipitation averages 49 Inches. Fenwick 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 | 30.0 °F | 44.4 °F | 3.77 in. |
| February | 30.9 °F | 46.0 °F | 3.1 in. |
| March | 36.9 °F | 51.4 °F | 4.46 in. |
| April | 46.1 °F | 61.3 °F | 3.63 in. |
| May | 55.3 °F | 69.4 °F | 3.8 in. |
| June | 65.2 °F | 78.5 °F | 3.81 in. |
| July | 70.3 °F | 83.9 °F | 4.53 in. |
| August | 69.6 °F | 82.3 °F | 4.92 in. |
| September | 64.6 °F | 77.1 °F | 4.27 in. |
| October | 53.1 °F | 67.8 °F | 4.75 in. |
| November | 42.3 °F | 57.3 °F | 3.65 in. |
| December | 34.5 °F | 49.0 °F | 4.35 in. |
| Annual | 49.9 °F | 64 °F | 49.04 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 |