Sylvan Beach, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 3.1 °C (low) to 14 °C (high). Annual precipitation averages 1167.1 Millimeters. Sylvan Beach is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -10.1 °C | -0.7 °C | 78.74 mm |
| February | -9.6 °C | 0.6 °C | 68.83 mm |
| March | -5 °C | 5.1 °C | 78.99 mm |
| April | 1.4 °C | 13.3 °C | 89.41 mm |
| May | 7.8 °C | 20.4 °C | 106.43 mm |
| June | 12.8 °C | 25 °C | 115.82 mm |
| July | 15.4 °C | 27.6 °C | 106.68 mm |
| August | 14.8 °C | 26.7 °C | 103.63 mm |
| September | 10.7 °C | 22.8 °C | 110.24 mm |
| October | 5.1 °C | 15.6 °C | 123.44 mm |
| November | -0.1 °C | 8.8 °C | 90.93 mm |
| December | -5.6 °C | 2.4 °C | 93.98 mm |
| Annual | 3.1 °C | 14 °C | 1167.12 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 5b : -26.1°C to -23.3°C |
| Plant Hardiness Zone - 2012 | Zone 5a : -28.9°C to -26.1°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |