Lyon Mountain, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 0.7 °C (low) to 11.5 °C (high). Annual precipitation averages 1180.1 Millimeters. Lyon Mountain is located in USDA Plant Hardiness Zone 4b. 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 | -13.9 °C | -3.2 °C | 77.72 mm |
| February | -12.5 °C | -1.8 °C | 63.5 mm |
| March | -7.5 °C | 2.8 °C | 76.2 mm |
| April | -0.6 °C | 10.6 °C | 97.28 mm |
| May | 6.2 °C | 18.1 °C | 107.44 mm |
| June | 11.1 °C | 22.7 °C | 124.71 mm |
| July | 13.7 °C | 25.1 °C | 116.59 mm |
| August | 12.8 °C | 24.2 °C | 108.46 mm |
| September | 8.7 °C | 20.6 °C | 106.68 mm |
| October | 3.2 °C | 13.2 °C | 127.76 mm |
| November | -3.1 °C | 5.6 °C | 89.15 mm |
| December | -9.7 °C | -0.5 °C | 84.58 mm |
| Annual | 0.7 °C | 11.5 °C | 1180.07 mm |
| 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 4b : -31.7°C to -28.9°C |
| Plant Hardiness Zone - 2012 | Zone 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |