Peacham, Vermont has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -0.6 °C (low) to 11.3 °C (high). Annual precipitation averages 1135.6 Millimeters. Peacham 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 Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -15.1 °C | -4 °C | 72.14 mm |
| February | -14.8 °C | -2.3 °C | 64.52 mm |
| March | -9.2 °C | 2.8 °C | 75.44 mm |
| April | -1.8 °C | 10.3 °C | 89.66 mm |
| May | 4.9 °C | 18.1 °C | 108.2 mm |
| June | 10.1 °C | 22.6 °C | 109.73 mm |
| July | 12.8 °C | 25.3 °C | 114.05 mm |
| August | 11.7 °C | 24.6 °C | 114.05 mm |
| September | 7.4 °C | 20.4 °C | 97.28 mm |
| October | 1.7 °C | 12.7 °C | 116.33 mm |
| November | -4.1 °C | 5.4 °C | 81.28 mm |
| December | -10.3 °C | -0.9 °C | 92.96 mm |
| Annual | -0.6 °C | 11.3 °C | 1135.64 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 21 - May 31 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 4b : -31.7°C to -28.9°C |
| Plant Hardiness Zone - 2012 | Zone 4a : -34.4°C to -31.7°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |