Syosset, New York has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 7.2 °C (low) to 16.7 °C (high). Annual precipitation averages 1213.9 Millimeters. Syosset 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 | -4.1 °C | 4.2 °C | 95.25 mm |
| February | -3.4 °C | 5.6 °C | 77.72 mm |
| March | -0.1 °C | 10.2 °C | 109.22 mm |
| April | 5 °C | 15.7 °C | 103.63 mm |
| May | 10.3 °C | 21.1 °C | 95.5 mm |
| June | 15.7 °C | 26.1 °C | 105.41 mm |
| July | 19.1 °C | 28.5 °C | 95 mm |
| August | 18.4 °C | 27.5 °C | 110.74 mm |
| September | 14.7 °C | 23.9 °C | 104.65 mm |
| October | 8.6 °C | 18.2 °C | 116.59 mm |
| November | 3.3 °C | 12 °C | 88.9 mm |
| December | -0.8 °C | 7.2 °C | 111.25 mm |
| Annual | 7.2 °C | 16.7 °C | 1213.86 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 7a : -17.8°C to -15°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |