Port Ewen, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 4.4 °C (low) to 16.5 °C (high). Annual precipitation averages 1224.3 Millimeters. Port Ewen is located in USDA Plant Hardiness Zone 6b. 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 | -8.3 °C | 2.3 °C | 89.66 mm |
| February | -7.3 °C | 3.9 °C | 69.85 mm |
| March | -2.8 °C | 8.9 °C | 93.47 mm |
| April | 3.2 °C | 16.3 °C | 98.3 mm |
| May | 9 °C | 22.6 °C | 95.76 mm |
| June | 14.1 °C | 27.2 °C | 108.2 mm |
| July | 16.8 °C | 29.8 °C | 120.14 mm |
| August | 16 °C | 28.7 °C | 109.98 mm |
| September | 11.7 °C | 24.6 °C | 121.67 mm |
| October | 5.6 °C | 17.7 °C | 121.16 mm |
| November | 0 °C | 11.1 °C | 90.42 mm |
| December | -4.7 °C | 4.9 °C | 105.66 mm |
| Annual | 4.4 °C | 16.5 °C | 1224.27 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |