West Brookfield, Massachusetts has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 3 °C (low) to 14.6 °C (high). Annual precipitation averages 1225.3 Millimeters. West Brookfield is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -9.5 °C | 0.9 °C | 92.2 mm |
| February | -9.1 °C | 2.4 °C | 82.3 mm |
| March | -4.6 °C | 6.8 °C | 105.66 mm |
| April | 1.3 °C | 14.1 °C | 98.55 mm |
| May | 7.3 °C | 20.1 °C | 91.69 mm |
| June | 12.4 °C | 24.7 °C | 107.7 mm |
| July | 15.7 °C | 27.6 °C | 105.66 mm |
| August | 14.7 °C | 26.6 °C | 111.76 mm |
| September | 10.4 °C | 22.7 °C | 108.97 mm |
| October | 4 °C | 16 °C | 119.13 mm |
| November | -1.2 °C | 9.7 °C | 92.71 mm |
| December | -5.8 °C | 3.9 °C | 108.97 mm |
| Annual | 3 °C | 14.6 °C | 1225.3 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |