Plainville, Massachusetts has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 4.7 °C (low) to 15.3 °C (high). Annual precipitation averages 1283.5 Millimeters. Plainville is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -7.4 °C | 2.3 °C | 103.63 mm |
| February | -6.8 °C | 3.7 °C | 89.66 mm |
| March | -2.5 °C | 7.6 °C | 124.71 mm |
| April | 3.2 °C | 14.3 °C | 117.6 mm |
| May | 8.5 °C | 20.1 °C | 90.17 mm |
| June | 13.7 °C | 24.7 °C | 107.7 mm |
| July | 16.9 °C | 27.8 °C | 90.17 mm |
| August | 16.1 °C | 26.9 °C | 99.57 mm |
| September | 12.1 °C | 23.1 °C | 103.12 mm |
| October | 5.8 °C | 16.8 °C | 127.25 mm |
| November | 0.5 °C | 10.8 °C | 107.44 mm |
| December | -4.2 °C | 5.3 °C | 122.43 mm |
| Annual | 4.7 °C | 15.3 °C | 1283.45 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |