Gales Ferry, Connecticut has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 5.8 °C (low) to 16.1 °C (high). Annual precipitation averages 1272.3 Millimeters. Gales Ferry is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -6.1 °C | 3.4 °C | 97.28 mm |
| February | -5.1 °C | 4.8 °C | 85.85 mm |
| March | -1.2 °C | 8.8 °C | 121.92 mm |
| April | 4.1 °C | 14.8 °C | 118.11 mm |
| May | 9.4 °C | 20.5 °C | 95 mm |
| June | 14.7 °C | 25.4 °C | 104.39 mm |
| July | 18.2 °C | 28.3 °C | 87.38 mm |
| August | 17.3 °C | 27.7 °C | 103.89 mm |
| September | 13 °C | 23.8 °C | 112.27 mm |
| October | 6.8 °C | 17.7 °C | 121.41 mm |
| November | 1.6 °C | 11.8 °C | 103.12 mm |
| December | -2.7 °C | 6.6 °C | 121.67 mm |
| Annual | 5.8 °C | 16.1 °C | 1272.29 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |