Canaan, New Hampshire has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -0.2 °C (low) to 12.3 °C (high). Annual precipitation averages 1125.7 Millimeters. Canaan is located in USDA Plant Hardiness Zone 5a. 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 | -13.9 °C | -2.6 °C | 75.95 mm |
| February | -13.7 °C | -0.7 °C | 65.28 mm |
| March | -8.2 °C | 4.1 °C | 81.03 mm |
| April | -1.6 °C | 11.6 °C | 87.88 mm |
| May | 5.3 °C | 18.8 °C | 92.71 mm |
| June | 9.8 °C | 23.3 °C | 108.46 mm |
| July | 12.6 °C | 25.9 °C | 110.74 mm |
| August | 11.4 °C | 25.2 °C | 97.54 mm |
| September | 7.3 °C | 21.1 °C | 95.25 mm |
| October | 1.3 °C | 13.7 °C | 126.75 mm |
| November | -3.7 °C | 6.8 °C | 87.88 mm |
| December | -9.5 °C | 0.5 °C | 96.27 mm |
| Annual | -0.2 °C | 12.3 °C | 1125.74 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 5a : -28.9°C to -26.1°C |
| Plant Hardiness Zone - 2012 | Zone 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |