New Braintree, Massachusetts has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 3 °C (low) to 13.9 °C (high). Annual precipitation averages 1225.6 Millimeters. New Braintree is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -9.5 °C | 0.2 °C | 93.22 mm |
| February | -8.8 °C | 1.7 °C | 83.31 mm |
| March | -4.6 °C | 5.9 °C | 103.89 mm |
| April | 1.4 °C | 13.2 °C | 98.3 mm |
| May | 6.9 °C | 19.3 °C | 91.95 mm |
| June | 12.4 °C | 24 °C | 105.66 mm |
| July | 15.6 °C | 27.1 °C | 105.66 mm |
| August | 14.7 °C | 26.1 °C | 112.27 mm |
| September | 10.5 °C | 21.9 °C | 111 mm |
| October | 4.3 °C | 15.1 °C | 121.16 mm |
| November | -1.2 °C | 8.8 °C | 93.22 mm |
| December | -5.8 °C | 3.1 °C | 105.92 mm |
| Annual | 3 °C | 13.9 °C | 1225.56 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| 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 |