West Valley, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 35 °F (low) to 55.2 °F (high). Annual precipitation averages 48 Inches. West Valley 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 Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 13.4 °F | 29.9 °F | 3.85 in. |
| February | 14.2 °F | 32.2 °F | 2.74 in. |
| March | 20.4 °F | 40.4 °F | 3.3 in. |
| April | 31.6 °F | 54.2 °F | 3.75 in. |
| May | 43.1 °F | 66.7 °F | 3.84 in. |
| June | 51.7 °F | 74.5 °F | 4.57 in. |
| July | 56.0 °F | 78.4 °F | 4.78 in. |
| August | 54.2 °F | 77.1 °F | 4.32 in. |
| September | 47.8 °F | 70.7 °F | 4.32 in. |
| October | 37.6 °F | 58.4 °F | 4.41 in. |
| November | 28.8 °F | 45.4 °F | 4.09 in. |
| December | 20.6 °F | 35.0 °F | 4.04 in. |
| Annual | 35 °F | 55.2 °F | 48.01 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5b : -15°F to -10°F |
| Plant Hardiness Zone - 2012 | Zone 5a : -20°F to -15°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |