Canaan, Connecticut has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 2.6 °C (low) to 15.1 °C (high). Annual precipitation averages 1183.7 Millimeters. Canaan 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. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -9.9 °C | 1 °C | 79.25 mm |
| February | -9.1 °C | 2.8 °C | 65.53 mm |
| March | -4.6 °C | 7.2 °C | 88.39 mm |
| April | 1.1 °C | 15 °C | 89.66 mm |
| May | 7.1 °C | 21.4 °C | 94.49 mm |
| June | 12.2 °C | 25.6 °C | 119.89 mm |
| July | 14.9 °C | 28.4 °C | 118.62 mm |
| August | 14.1 °C | 27.3 °C | 111 mm |
| September | 9.7 °C | 23.1 °C | 111.51 mm |
| October | 3.7 °C | 16.4 °C | 121.41 mm |
| November | -1.4 °C | 9.8 °C | 84.84 mm |
| December | -6.1 °C | 3.7 °C | 99.06 mm |
| Annual | 2.6 °C | 15.1 °C | 1183.65 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| 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 |