Whitinsville, Massachusetts has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 3.9 °C (low) to 15.6 °C (high). Annual precipitation averages 1255 Millimeters. Whitinsville is located in USDA Plant Hardiness Zone 6b. 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 | -8.4 °C | 2.3 °C | 98.04 mm |
| February | -7.7 °C | 3.7 °C | 89.15 mm |
| March | -3.4 °C | 7.8 °C | 120.65 mm |
| April | 2.3 °C | 14.8 °C | 114.55 mm |
| May | 8 °C | 20.7 °C | 88.14 mm |
| June | 13.2 °C | 25.3 °C | 103.89 mm |
| July | 16.5 °C | 28.2 °C | 95.5 mm |
| August | 15.4 °C | 27.4 °C | 101.35 mm |
| September | 11.2 °C | 23.6 °C | 98.81 mm |
| October | 4.9 °C | 17.1 °C | 123.7 mm |
| November | -0.4 °C | 10.9 °C | 97.54 mm |
| December | -5.1 °C | 5.2 °C | 123.7 mm |
| Annual | 3.9 °C | 15.6 °C | 1255.02 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 6b : -20.6°C to -17.8°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 |