Northford, Connecticut has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 5.3 °C (low) to 16 °C (high). Annual precipitation averages 1298.5 Millimeters. Northford is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -6.7 °C | 2.7 °C | 101.09 mm |
| February | -5.9 °C | 4.1 °C | 86.36 mm |
| March | -1.8 °C | 8.3 °C | 122.68 mm |
| April | 3.7 °C | 15.1 °C | 115.06 mm |
| May | 9.2 °C | 20.9 °C | 101.6 mm |
| June | 14.5 °C | 25.8 °C | 110.24 mm |
| July | 17.7 °C | 28.9 °C | 93.22 mm |
| August | 16.8 °C | 27.9 °C | 103.89 mm |
| September | 12.8 °C | 24.2 °C | 114.05 mm |
| October | 6.3 °C | 17.6 °C | 131.83 mm |
| November | 0.9 °C | 11.2 °C | 101.09 mm |
| December | -3.5 °C | 5.6 °C | 117.35 mm |
| Annual | 5.3 °C | 16 °C | 1298.46 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |