Brookfield, Vermont has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Annual precipitation averages 1098 Millimeters. Brookfield is located in USDA Plant Hardiness Zone 5a. 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 | -13.8 °C | -3.7 °C | 79.25 mm |
| February | -13.2 °C | -2 °C | 69.34 mm |
| March | -8.2 °C | 2.7 °C | 81.03 mm |
| April | -1.4 °C | 10.2 °C | 84.33 mm |
| May | 5.4 °C | 17.8 °C | 80.26 mm |
| June | 10.1 °C | 22.2 °C | 111.51 mm |
| July | 12.9 °C | 24.7 °C | 109.22 mm |
| August | 11.8 °C | 24.1 °C | 107.7 mm |
| September | 7.8 °C | 19.9 °C | 91.69 mm |
| October | 1.9 °C | 12.6 °C | 111.76 mm |
| November | -3.7 °C | 5.6 °C | 78.99 mm |
| December | -9.6 °C | -0.6 °C | 92.96 mm |
| Annual | -0 °C | 11.1 °C | 1098.04 mm |
| 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 5a : -28.9°C to -26.1°C |
| Plant Hardiness Zone - 2012 | Zone 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |