North Brookfield, Massachusetts has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 3.2 °C (low) to 13.9 °C (high). Annual precipitation averages 1235.4 Millimeters. North 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 | -9.3 °C | 0.3 °C | 93.22 mm |
| February | -8.8 °C | 1.7 °C | 82.8 mm |
| March | -4.4 °C | 6.1 °C | 106.68 mm |
| April | 1.6 °C | 13.2 °C | 101.09 mm |
| May | 7.5 °C | 19.2 °C | 92.2 mm |
| June | 12.6 °C | 23.9 °C | 107.44 mm |
| July | 15.7 °C | 26.8 °C | 104.65 mm |
| August | 14.8 °C | 25.9 °C | 111.25 mm |
| September | 10.6 °C | 21.9 °C | 109.73 mm |
| October | 4.3 °C | 15.2 °C | 122.17 mm |
| November | -0.7 °C | 9 °C | 94.23 mm |
| December | -5.7 °C | 3.3 °C | 109.98 mm |
| Annual | 3.2 °C | 13.9 °C | 1235.44 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 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |