West Newbury, Massachusetts has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 4 °C (low) to 15.2 °C (high). Annual precipitation averages 1247.6 Millimeters. West Newbury 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 | 1.9 °C | 93.98 mm |
| February | -7.4 °C | 3.3 °C | 91.19 mm |
| March | -3.3 °C | 7.3 °C | 120.65 mm |
| April | 2.2 °C | 14.1 °C | 109.22 mm |
| May | 7.8 °C | 19.8 °C | 99.31 mm |
| June | 13.2 °C | 24.9 °C | 109.73 mm |
| July | 16.4 °C | 28.2 °C | 90.42 mm |
| August | 15.5 °C | 27.4 °C | 87.88 mm |
| September | 11.3 °C | 23.4 °C | 99.06 mm |
| October | 5 °C | 16.6 °C | 126.49 mm |
| November | -0.1 °C | 10.6 °C | 98.81 mm |
| December | -4.8 °C | 4.8 °C | 120.9 mm |
| Annual | 4 °C | 15.2 °C | 1247.64 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 | Severe Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |