Sayville, New York has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 7.4 °C (low) to 15.9 °C (high). Annual precipitation averages 1266.2 Millimeters. Sayville is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -3.9 °C | 4 °C | 98.81 mm |
| February | -3.4 °C | 4.9 °C | 90.17 mm |
| March | 0 °C | 8.5 °C | 127.76 mm |
| April | 5.2 °C | 14.2 °C | 108.71 mm |
| May | 10.4 °C | 19.4 °C | 98.04 mm |
| June | 15.9 °C | 24.7 °C | 109.47 mm |
| July | 19.4 °C | 27.8 °C | 85.34 mm |
| August | 18.5 °C | 27.8 °C | 104.39 mm |
| September | 15.1 °C | 23.4 °C | 99.06 mm |
| October | 9.1 °C | 17.4 °C | 122.43 mm |
| November | 3.7 °C | 12.1 °C | 96.77 mm |
| December | -0.7 °C | 7 °C | 125.22 mm |
| Annual | 7.4 °C | 15.9 °C | 1266.17 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7b : -15°C to -12.2°C |
| Plant Hardiness Zone - 2012 | Zone 7a : -17.8°C to -15°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |