Long Neck, Delaware has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 9.2 °C (low) to 18.4 °C (high). Annual precipitation averages 1213.6 Millimeters. Long Neck 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 | -2.1 °C | 6.9 °C | 89.92 mm |
| February | -1.4 °C | 8 °C | 80.01 mm |
| March | 2.1 °C | 11.6 °C | 108.97 mm |
| April | 7.3 °C | 17.3 °C | 88.39 mm |
| May | 12.6 °C | 22 °C | 92.96 mm |
| June | 17.9 °C | 26.9 °C | 98.81 mm |
| July | 20.8 °C | 29.6 °C | 116.08 mm |
| August | 20.1 °C | 28.8 °C | 122.17 mm |
| September | 17.1 °C | 25.6 °C | 107.19 mm |
| October | 10.8 °C | 20.1 °C | 114.05 mm |
| November | 4.6 °C | 14.3 °C | 87.63 mm |
| December | 0.5 °C | 9.5 °C | 107.44 mm |
| Annual | 9.2 °C | 18.4 °C | 1213.62 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 | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |