Seaford, New York has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 8.1 °C (low) to 16.6 °C (high). Annual precipitation averages 1151.9 Millimeters. Seaford 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. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -3.3 °C | 4.3 °C | 95.76 mm |
| February | -2.7 °C | 5.4 °C | 76.45 mm |
| March | 0.7 °C | 8.9 °C | 107.19 mm |
| April | 5.8 °C | 15.1 °C | 104.65 mm |
| May | 11.1 °C | 20.4 °C | 90.17 mm |
| June | 16.6 °C | 25.5 °C | 100.08 mm |
| July | 19.9 °C | 28.7 °C | 88.39 mm |
| August | 19.3 °C | 28.1 °C | 99.82 mm |
| September | 15.7 °C | 24.6 °C | 94.74 mm |
| October | 9.6 °C | 18.3 °C | 109.73 mm |
| November | 4.2 °C | 12.3 °C | 78.74 mm |
| December | 0 °C | 7.2 °C | 106.17 mm |
| Annual | 8.1 °C | 16.6 °C | 1151.89 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 75-100 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 |