Lyndonville, Vermont has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 31 °F (low) to 53.3 °F (high). Annual precipitation averages 40.1 Inches. 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 | 4.0 °F | 25.4 °F | 2.38 in. |
| February | 4.7 °F | 29.0 °F | 2.14 in. |
| March | 15.0 °F | 38.0 °F | 2.38 in. |
| April | 29.0 °F | 51.9 °F | 3.1 in. |
| May | 40.8 °F | 65.6 °F | 4.07 in. |
| June | 50.2 °F | 74.2 °F | 3.78 in. |
| July | 55.5 °F | 78.9 °F | 4.35 in. |
| August | 53.6 °F | 77.5 °F | 4.09 in. |
| September | 46.0 °F | 69.7 °F | 3.57 in. |
| October | 35.0 °F | 55.8 °F | 4.08 in. |
| November | 25.2 °F | 42.8 °F | 2.74 in. |
| December | 13.5 °F | 31.2 °F | 3.41 in. |
| Annual | 31 °F | 53.3 °F | 40.09 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 4a : -30°F to -25°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |