Tuftonboro, New Hampshire has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 2.1 °C (low) to 13.5 °C (high). Annual precipitation averages 1177.8 Millimeters. Tuftonboro is located in USDA Plant Hardiness Zone 5b. 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 | -11.2 °C | -1.3 °C | 80.26 mm |
| February | -10.7 °C | 0.3 °C | 82.3 mm |
| March | -6.1 °C | 5.3 °C | 92.2 mm |
| April | 0.4 °C | 12.8 °C | 96.77 mm |
| May | 6.7 °C | 20 °C | 92.46 mm |
| June | 12 °C | 24.7 °C | 104.39 mm |
| July | 14.9 °C | 27.4 °C | 106.68 mm |
| August | 14.2 °C | 26.4 °C | 96.01 mm |
| September | 9.9 °C | 21.9 °C | 90.17 mm |
| October | 3.9 °C | 14.5 °C | 126.49 mm |
| November | -1.5 °C | 7.6 °C | 99.57 mm |
| December | -6.8 °C | 1.8 °C | 110.49 mm |
| Annual | 2.1 °C | 13.5 °C | 1177.79 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5b : -26.1°C to -23.3°C |
| Plant Hardiness Zone - 2012 | Zone 5a : -28.9°C to -26.1°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |