Millville, Massachusetts has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 4.3 °C (low) to 15.4 °C (high). Annual precipitation averages 1283.5 Millimeters. Millville 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 | -7.8 °C | 2.3 °C | 101.85 mm |
| February | -7.1 °C | 3.7 °C | 88.65 mm |
| March | -2.9 °C | 7.8 °C | 121.16 mm |
| April | 2.7 °C | 14.6 °C | 116.08 mm |
| May | 8.3 °C | 20.4 °C | 90.68 mm |
| June | 13.3 °C | 24.9 °C | 108.97 mm |
| July | 16.8 °C | 28 °C | 93.22 mm |
| August | 15.8 °C | 27.2 °C | 103.38 mm |
| September | 11.8 °C | 23.4 °C | 102.36 mm |
| October | 5.4 °C | 16.9 °C | 127.25 mm |
| November | 0.2 °C | 10.9 °C | 103.63 mm |
| December | -4.4 °C | 5.2 °C | 126.24 mm |
| Annual | 4.3 °C | 15.4 °C | 1283.47 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 |