Ashford, Connecticut has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 3.7 °C (low) to 14.9 °C (high). Annual precipitation averages 1206.5 Millimeters. Ashford is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -8.3 °C | 1.7 °C | 87.63 mm |
| February | -7.8 °C | 3.1 °C | 77.98 mm |
| March | -3.6 °C | 7.3 °C | 105.16 mm |
| April | 1.9 °C | 14.3 °C | 101.09 mm |
| May | 7.6 °C | 20.1 °C | 88.65 mm |
| June | 12.7 °C | 24.6 °C | 105.66 mm |
| July | 16 °C | 27.4 °C | 99.31 mm |
| August | 15 °C | 26.5 °C | 110.49 mm |
| September | 11 °C | 22.8 °C | 108.71 mm |
| October | 4.8 °C | 16.3 °C | 120.14 mm |
| November | -0.6 °C | 10.3 °C | 93.22 mm |
| December | -4.9 °C | 4.7 °C | 108.46 mm |
| Annual | 3.7 °C | 14.9 °C | 1206.5 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |