New Boston, New Hampshire has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 2.5 °C (low) to 14.2 °C (high). Annual precipitation averages 1220.5 Millimeters. New Boston 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. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -10.4 °C | 0 °C | 85.34 mm |
| February | -9.8 °C | 1.7 °C | 85.09 mm |
| March | -5.2 °C | 6.2 °C | 98.81 mm |
| April | 0.9 °C | 13.6 °C | 99.82 mm |
| May | 7.1 °C | 19.8 °C | 95 mm |
| June | 12.3 °C | 24.8 °C | 115.82 mm |
| July | 15.3 °C | 27.6 °C | 97.79 mm |
| August | 14.2 °C | 26.8 °C | 96.27 mm |
| September | 10 °C | 22.7 °C | 104.39 mm |
| October | 3.6 °C | 15.4 °C | 126.75 mm |
| November | -1.6 °C | 9.1 °C | 101.35 mm |
| December | -6.8 °C | 3.1 °C | 114.05 mm |
| Annual | 2.5 °C | 14.2 °C | 1220.48 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| 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 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |