Shrewsbury, Massachusetts has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 3.7 °C (low) to 14.7 °C (high). Annual precipitation averages 1249.4 Millimeters. Shrewsbury is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -8.9 °C | 1.1 °C | 95.5 mm |
| February | -8.2 °C | 2.6 °C | 83.57 mm |
| March | -3.8 °C | 6.8 °C | 114.55 mm |
| April | 2.1 °C | 13.9 °C | 108.46 mm |
| May | 8.1 °C | 19.9 °C | 91.19 mm |
| June | 13.3 °C | 24.5 °C | 106.68 mm |
| July | 16.4 °C | 27.5 °C | 99.06 mm |
| August | 15.6 °C | 26.7 °C | 107.95 mm |
| September | 11.2 °C | 22.9 °C | 102.11 mm |
| October | 4.8 °C | 16.2 °C | 127.25 mm |
| November | -0.6 °C | 10.1 °C | 97.03 mm |
| December | -5.3 °C | 4.2 °C | 116.08 mm |
| Annual | 3.7 °C | 14.7 °C | 1249.43 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°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 |