Halifax, Massachusetts has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 4.8 °C (low) to 15.9 °C (high). Annual precipitation averages 1334 Millimeters. Halifax is located in USDA Plant Hardiness Zone 6b. 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 | -6.8 °C | 3.3 °C | 111.51 mm |
| February | -6.2 °C | 4.4 °C | 99.57 mm |
| March | -2.3 °C | 8.2 °C | 142.75 mm |
| April | 2.9 °C | 14.4 °C | 120.4 mm |
| May | 8.3 °C | 20.1 °C | 93.73 mm |
| June | 13.5 °C | 25.1 °C | 99.57 mm |
| July | 17 °C | 28.3 °C | 89.41 mm |
| August | 16.1 °C | 27.6 °C | 93.22 mm |
| September | 12.2 °C | 23.7 °C | 104.14 mm |
| October | 6 °C | 17.3 °C | 129.03 mm |
| November | 0.8 °C | 11.6 °C | 117.86 mm |
| December | -3.7 °C | 6.3 °C | 132.84 mm |
| Annual | 4.8 °C | 15.9 °C | 1334.03 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |