Slaughter Beach, Delaware has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 48.5 °F (low) to 64.6 °F (high). Annual precipitation averages 47.1 Inches. Slaughter Beach is located in USDA Plant Hardiness Zone 7b. 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 | 28.1 °F | 43.5 °F | 3.42 in. |
| February | 28.9 °F | 45.2 °F | 3.03 in. |
| March | 35.4 °F | 51.7 °F | 4.29 in. |
| April | 45.3 °F | 62.6 °F | 3.54 in. |
| May | 54.9 °F | 71.4 °F | 3.88 in. |
| June | 64.4 °F | 80.4 °F | 3.96 in. |
| July | 69.4 °F | 85.4 °F | 4.42 in. |
| August | 68.0 °F | 83.6 °F | 4.75 in. |
| September | 62.7 °F | 77.9 °F | 4.36 in. |
| October | 51.5 °F | 67.8 °F | 4.08 in. |
| November | 40.9 °F | 57.0 °F | 3.27 in. |
| December | 33.0 °F | 48.3 °F | 4.08 in. |
| Annual | 48.5 °F | 64.6 °F | 47.08 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 7b : 5°F to 10°F |
| Plant Hardiness Zone - 2012 | Zone 7b : 5°F to 10°F |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |