Montpelier, Vermont has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 32.7 °F (low) to 55.3 °F (high). Annual precipitation averages 40.4 Inches. Montpelier is located in USDA Plant Hardiness Zone 4b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 6.3 °F | 27.2 °F | 2.63 in. |
| February | 7.2 °F | 30.8 °F | 2.18 in. |
| March | 17.1 °F | 39.8 °F | 2.53 in. |
| April | 30.6 °F | 53.4 °F | 3.54 in. |
| May | 42.3 °F | 67.4 °F | 3.27 in. |
| June | 51.7 °F | 76.2 °F | 4.41 in. |
| July | 56.7 °F | 81.1 °F | 4.64 in. |
| August | 54.8 °F | 79.5 °F | 3.94 in. |
| September | 47.4 °F | 72.2 °F | 3.44 in. |
| October | 36.1 °F | 58.0 °F | 3.57 in. |
| November | 26.4 °F | 44.8 °F | 3.02 in. |
| December | 15.2 °F | 32.8 °F | 3.26 in. |
| Annual | 32.7 °F | 55.3 °F | 40.43 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 4b : -25°F to -20°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |