West Kill, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 1.2 °C (low) to 13.4 °C (high). Annual precipitation averages 1229.9 Millimeters. West Kill is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -10.9 °C | -0.2 °C | 89.41 mm |
| February | -10.3 °C | 1.4 °C | 68.58 mm |
| March | -6.4 °C | 5.5 °C | 105.16 mm |
| April | -0.3 °C | 12.9 °C | 94.74 mm |
| May | 5.3 °C | 19.4 °C | 98.55 mm |
| June | 10.4 °C | 23.6 °C | 123.7 mm |
| July | 12.9 °C | 25.8 °C | 116.08 mm |
| August | 12.2 °C | 25.1 °C | 106.68 mm |
| September | 8.3 °C | 21.5 °C | 116.08 mm |
| October | 2.5 °C | 14.9 °C | 123.19 mm |
| November | -2.3 °C | 8.3 °C | 90.42 mm |
| December | -6.8 °C | 2.7 °C | 97.28 mm |
| Annual | 1.2 °C | 13.4 °C | 1229.87 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5b : -26.1°C to -23.3°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 |