Canterbury, New Hampshire has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 2 °C (low) to 13.4 °C (high). Annual precipitation averages 1244.6 Millimeters. Canterbury is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -10.8 °C | -1.1 °C | 82.55 mm |
| February | -10.1 °C | 0.6 °C | 79.76 mm |
| March | -5.9 °C | 5.4 °C | 91.69 mm |
| April | 0.3 °C | 12.7 °C | 101.35 mm |
| May | 6.5 °C | 19.4 °C | 102.36 mm |
| June | 11.7 °C | 24.1 °C | 117.09 mm |
| July | 14.6 °C | 27.1 °C | 110.24 mm |
| August | 13.8 °C | 26.1 °C | 110.74 mm |
| September | 9.5 °C | 21.9 °C | 107.44 mm |
| October | 3.3 °C | 14.5 °C | 136.65 mm |
| November | -1.9 °C | 7.8 °C | 96.01 mm |
| December | -7.3 °C | 1.9 °C | 108.71 mm |
| Annual | 2 °C | 13.4 °C | 1244.59 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 11 - May 20 |
| 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 | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |