Slaughter Beach, Delaware has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 9.2 °C (low) to 18.1 °C (high). Annual precipitation averages 1195.8 Millimeters. 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 | -2.2 °C | 6.4 °C | 86.87 mm |
| February | -1.7 °C | 7.3 °C | 76.96 mm |
| March | 1.9 °C | 10.9 °C | 108.97 mm |
| April | 7.4 °C | 17 °C | 89.92 mm |
| May | 12.7 °C | 21.9 °C | 98.55 mm |
| June | 18 °C | 26.9 °C | 100.58 mm |
| July | 20.8 °C | 29.7 °C | 112.27 mm |
| August | 20 °C | 28.7 °C | 120.65 mm |
| September | 17.1 °C | 25.5 °C | 110.74 mm |
| October | 10.8 °C | 19.9 °C | 103.63 mm |
| November | 4.9 °C | 13.9 °C | 83.06 mm |
| December | 0.6 °C | 9.1 °C | 103.63 mm |
| Annual | 9.2 °C | 18.1 °C | 1195.83 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 7b : -15°C to -12.2°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 |