Lyndonville, Vermont has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -0.5 °C (low) to 11.9 °C (high). Annual precipitation averages 1018.3 Millimeters. Lyndonville 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 | -15.6 °C | -3.7 °C | 60.45 mm |
| February | -15.2 °C | -1.7 °C | 54.36 mm |
| March | -9.4 °C | 3.3 °C | 60.45 mm |
| April | -1.7 °C | 11.1 °C | 78.74 mm |
| May | 4.9 °C | 18.7 °C | 103.38 mm |
| June | 10.1 °C | 23.4 °C | 96.01 mm |
| July | 13.1 °C | 26.1 °C | 110.49 mm |
| August | 12 °C | 25.3 °C | 103.89 mm |
| September | 7.8 °C | 20.9 °C | 90.68 mm |
| October | 1.7 °C | 13.2 °C | 103.63 mm |
| November | -3.8 °C | 6 °C | 69.6 mm |
| December | -10.3 °C | -0.4 °C | 86.61 mm |
| Annual | -0.5 °C | 11.9 °C | 1018.29 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 4a : -34.4°C to -31.7°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |