Lyon Mountain, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 33.3 °F (low) to 52.6 °F (high). Annual precipitation averages 46.5 Inches. 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 | 7.0 °F | 26.3 °F | 3.06 in. |
| February | 9.5 °F | 28.8 °F | 2.5 in. |
| March | 18.5 °F | 37.0 °F | 3.0 in. |
| April | 31.0 °F | 51.0 °F | 3.83 in. |
| May | 43.2 °F | 64.5 °F | 4.23 in. |
| June | 52.0 °F | 72.9 °F | 4.91 in. |
| July | 56.7 °F | 77.2 °F | 4.59 in. |
| August | 55.1 °F | 75.5 °F | 4.27 in. |
| September | 47.7 °F | 69.0 °F | 4.2 in. |
| October | 37.8 °F | 55.7 °F | 5.03 in. |
| November | 26.4 °F | 42.1 °F | 3.51 in. |
| December | 14.5 °F | 31.1 °F | 3.33 in. |
| Annual | 33.3 °F | 52.6 °F | 46.46 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 4b : -25°F to -20°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |