Marshfield, Vermont has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 31.9 °F (low) to 53.8 °F (high). Annual precipitation averages 41.8 Inches. Marshfield 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 | 5.6 °F | 26.1 °F | 2.56 in. |
| February | 7.0 °F | 29.6 °F | 2.28 in. |
| March | 16.7 °F | 38.4 °F | 2.74 in. |
| April | 29.8 °F | 52.3 °F | 3.29 in. |
| May | 41.8 °F | 66.2 °F | 3.75 in. |
| June | 50.6 °F | 74.6 °F | 4.46 in. |
| July | 55.7 °F | 79.3 °F | 4.62 in. |
| August | 53.5 °F | 77.7 °F | 3.91 in. |
| September | 46.1 °F | 70.3 °F | 3.68 in. |
| October | 35.5 °F | 56.3 °F | 4.12 in. |
| November | 25.7 °F | 43.0 °F | 3.0 in. |
| December | 14.6 °F | 31.7 °F | 3.42 in. |
| Annual | 31.9 °F | 53.8 °F | 41.83 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 |