Mount Holly, Vermont has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 33 °F (low) to 52.5 °F (high). Annual precipitation averages 54.2 Inches. Mount Holly is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around Jun. 1 - Jun. 10 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 10.0 °F | 28.3 °F | 3.82 in. |
| February | 10.9 °F | 31.1 °F | 3.29 in. |
| March | 18.4 °F | 37.9 °F | 4.48 in. |
| April | 28.3 °F | 50.4 °F | 4.36 in. |
| May | 42.4 °F | 63.2 °F | 4.53 in. |
| June | 51.4 °F | 70.9 °F | 5.52 in. |
| July | 55.9 °F | 75.6 °F | 4.81 in. |
| August | 54.7 °F | 74.0 °F | 4.59 in. |
| September | 46.2 °F | 68.1 °F | 4.44 in. |
| October | 36.0 °F | 54.8 °F | 5.46 in. |
| November | 26.4 °F | 42.9 °F | 4.2 in. |
| December | 15.7 °F | 33.0 °F | 4.65 in. |
| Annual | 33 °F | 52.5 °F | 54.15 in. |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | Jun. 1 - Jun. 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5b : -15°F to -10°F |
| Plant Hardiness Zone - 2012 | Zone 5a : -20°F to -15°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |