Lunenburg, Vermont has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 30.8 °F (low) to 53 °F (high). Annual precipitation averages 40.2 Inches. Lunenburg is located in USDA Plant Hardiness Zone 4b. The growing season typically runs from the last frost around May 21 - May 31 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 4.9 °F | 25.7 °F | 2.27 in. |
| February | 6.0 °F | 29.1 °F | 2.16 in. |
| March | 16.1 °F | 38.1 °F | 2.17 in. |
| April | 28.8 °F | 51.5 °F | 3.09 in. |
| May | 40.4 °F | 65.4 °F | 3.86 in. |
| June | 49.6 °F | 73.5 °F | 4.25 in. |
| July | 54.3 °F | 78.0 °F | 4.2 in. |
| August | 52.3 °F | 76.5 °F | 4.16 in. |
| September | 44.8 °F | 69.2 °F | 3.64 in. |
| October | 34.6 °F | 55.5 °F | 4.12 in. |
| November | 24.8 °F | 42.4 °F | 2.92 in. |
| December | 13.3 °F | 31.0 °F | 3.34 in. |
| Annual | 30.8 °F | 53 °F | 40.18 in. |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 21 - May 31 |
| 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 |