Brookfield, Vermont has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 32 °F (low) to 52 °F (high). Annual precipitation averages 43.2 Inches. 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 | 7.1 °F | 25.3 °F | 3.12 in. |
| February | 8.2 °F | 28.4 °F | 2.73 in. |
| March | 17.2 °F | 36.8 °F | 3.19 in. |
| April | 29.5 °F | 50.4 °F | 3.32 in. |
| May | 41.7 °F | 64.1 °F | 3.16 in. |
| June | 50.2 °F | 72.0 °F | 4.39 in. |
| July | 55.2 °F | 76.5 °F | 4.3 in. |
| August | 53.3 °F | 75.3 °F | 4.24 in. |
| September | 46.1 °F | 67.9 °F | 3.61 in. |
| October | 35.5 °F | 54.7 °F | 4.4 in. |
| November | 25.4 °F | 42.1 °F | 3.11 in. |
| December | 14.7 °F | 30.9 °F | 3.66 in. |
| Annual | 32 °F | 52 °F | 43.23 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 5a : -20°F to -15°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 |