East Sandwich, Massachusetts has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 6.6 °C (low) to 14.9 °C (high). Annual precipitation averages 1288 Millimeters. East Sandwich is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -4.6 °C | 3.9 °C | 109.22 mm |
| February | -4 °C | 4.4 °C | 97.54 mm |
| March | -1 °C | 7.4 °C | 128.52 mm |
| April | 3.9 °C | 12.3 °C | 118.11 mm |
| May | 9.2 °C | 17.7 °C | 92.46 mm |
| June | 14.4 °C | 22.8 °C | 97.03 mm |
| July | 18.2 °C | 26.3 °C | 75.69 mm |
| August | 17.8 °C | 25.6 °C | 92.96 mm |
| September | 14.3 °C | 22.3 °C | 107.19 mm |
| October | 8.5 °C | 16.7 °C | 125.48 mm |
| November | 3.3 °C | 11.8 °C | 108.46 mm |
| December | -1.2 °C | 7 °C | 135.38 mm |
| Annual | 6.6 °C | 14.9 °C | 1288.04 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 7a : -17.8°C to -15°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |