East Pepperell, Massachusetts has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 3 °C (low) to 15.3 °C (high). Annual precipitation averages 1219.7 Millimeters. East Pepperell 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. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -9.8 °C | 1.2 °C | 90.17 mm |
| February | -8.9 °C | 2.8 °C | 84.07 mm |
| March | -4.4 °C | 7.2 °C | 108.97 mm |
| April | 1.4 °C | 14.6 °C | 101.85 mm |
| May | 7.4 °C | 20.8 °C | 96.27 mm |
| June | 12.7 °C | 25.7 °C | 112.78 mm |
| July | 15.8 °C | 28.8 °C | 92.71 mm |
| August | 14.8 °C | 27.9 °C | 98.04 mm |
| September | 10.3 °C | 23.8 °C | 103.12 mm |
| October | 3.7 °C | 16.7 °C | 120.14 mm |
| November | -1.4 °C | 10.2 °C | 98.04 mm |
| December | -6.2 °C | 4.2 °C | 113.54 mm |
| Annual | 3 °C | 15.3 °C | 1219.7 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| 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 |