Lyndonville, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 5.2 °C (low) to 14.3 °C (high). Annual precipitation averages 865.4 Millimeters. Lyndonville is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -6.8 °C | 0.7 °C | 67.06 mm |
| February | -6.4 °C | 1.6 °C | 56.64 mm |
| March | -2.9 °C | 5.9 °C | 59.69 mm |
| April | 2.4 °C | 12.7 °C | 74.17 mm |
| May | 8.4 °C | 20 °C | 71.12 mm |
| June | 14.3 °C | 24.7 °C | 74.68 mm |
| July | 17.5 °C | 27.2 °C | 78.99 mm |
| August | 16.9 °C | 26.6 °C | 74.93 mm |
| September | 13.1 °C | 22.5 °C | 82.8 mm |
| October | 7.1 °C | 15.9 °C | 85.34 mm |
| November | 1.7 °C | 9.4 °C | 69.09 mm |
| December | -3.2 °C | 3.8 °C | 70.87 mm |
| Annual | 5.2 °C | 14.3 °C | 865.38 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |