Canaan, New Hampshire has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 31.6 °F (low) to 54.2 °F (high). Annual precipitation averages 44.3 Inches. 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 | 7.0 °F | 27.4 °F | 2.99 in. |
| February | 7.4 °F | 30.8 °F | 2.57 in. |
| March | 17.3 °F | 39.3 °F | 3.19 in. |
| April | 29.1 °F | 52.9 °F | 3.46 in. |
| May | 41.5 °F | 65.9 °F | 3.65 in. |
| June | 49.7 °F | 74.0 °F | 4.27 in. |
| July | 54.6 °F | 78.7 °F | 4.36 in. |
| August | 52.6 °F | 77.3 °F | 3.84 in. |
| September | 45.2 °F | 70.0 °F | 3.75 in. |
| October | 34.3 °F | 56.6 °F | 4.99 in. |
| November | 25.3 °F | 44.2 °F | 3.46 in. |
| December | 14.9 °F | 32.9 °F | 3.79 in. |
| Annual | 31.6 °F | 54.2 °F | 44.32 in. |
| 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 : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |