Westvale, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 3.8 °C (low) to 14 °C (high). Annual precipitation averages 1090.9 Millimeters. Westvale is located in USDA Plant Hardiness Zone 6a. 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 | -9.1 °C | -0.3 °C | 80.26 mm |
| February | -8.6 °C | 0.8 °C | 76.96 mm |
| March | -4.4 °C | 5.2 °C | 83.82 mm |
| April | 1.9 °C | 13.2 °C | 93.98 mm |
| May | 8.3 °C | 20.4 °C | 90.42 mm |
| June | 13.3 °C | 24.9 °C | 98.81 mm |
| July | 16.1 °C | 27.5 °C | 102.36 mm |
| August | 15.2 °C | 26.7 °C | 99.31 mm |
| September | 11.2 °C | 22.9 °C | 83.82 mm |
| October | 5.6 °C | 15.6 °C | 106.68 mm |
| November | 0.4 °C | 8.8 °C | 83.31 mm |
| December | -4.8 °C | 2.7 °C | 91.19 mm |
| Annual | 3.8 °C | 14 °C | 1090.92 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 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |