West Brookfield, Massachusetts has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 37.4 °F (low) to 58.3 °F (high). Annual precipitation averages 48.2 Inches. 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 | 14.9 °F | 33.7 °F | 3.63 in. |
| February | 15.6 °F | 36.4 °F | 3.24 in. |
| March | 23.8 °F | 44.3 °F | 4.16 in. |
| April | 34.3 °F | 57.3 °F | 3.88 in. |
| May | 45.1 °F | 68.2 °F | 3.61 in. |
| June | 54.4 °F | 76.4 °F | 4.24 in. |
| July | 60.2 °F | 81.7 °F | 4.16 in. |
| August | 58.4 °F | 79.9 °F | 4.4 in. |
| September | 50.8 °F | 72.8 °F | 4.29 in. |
| October | 39.2 °F | 60.8 °F | 4.69 in. |
| November | 29.9 °F | 49.5 °F | 3.65 in. |
| December | 21.6 °F | 39.1 °F | 4.29 in. |
| Annual | 37.4 °F | 58.3 °F | 48.24 in. |
| 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 : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |