Plainfield, Vermont has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 32.3 °F (low) to 54.4 °F (high). Annual precipitation averages 39.1 Inches. Plainfield 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 | 6.2 °F | 26.8 °F | 2.32 in. |
| February | 7.5 °F | 30.3 °F | 2.13 in. |
| March | 17.0 °F | 39.1 °F | 2.5 in. |
| April | 30.1 °F | 52.8 °F | 3.12 in. |
| May | 42.0 °F | 66.7 °F | 3.6 in. |
| June | 51.0 °F | 75.1 °F | 4.3 in. |
| July | 56.1 °F | 80.0 °F | 4.5 in. |
| August | 53.9 °F | 78.4 °F | 3.44 in. |
| September | 46.6 °F | 71.0 °F | 3.59 in. |
| October | 35.8 °F | 57.0 °F | 3.78 in. |
| November | 26.1 °F | 43.8 °F | 2.78 in. |
| December | 15.0 °F | 32.3 °F | 3.01 in. |
| Annual | 32.3 °F | 54.4 °F | 39.07 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 4a : -30°F to -25°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |