Granville, Massachusetts has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 2.5 °C (low) to 14.2 °C (high). Annual precipitation averages 1384.1 Millimeters. Granville is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -9.9 °C | 0.3 °C | 97.03 mm |
| February | -9.3 °C | 1.8 °C | 89.41 mm |
| March | -4.9 °C | 6.3 °C | 111 mm |
| April | 0.9 °C | 13.9 °C | 110.49 mm |
| May | 6.8 °C | 20.2 °C | 108.97 mm |
| June | 11.9 °C | 24.6 °C | 128.52 mm |
| July | 14.7 °C | 27.3 °C | 116.59 mm |
| August | 13.7 °C | 26.3 °C | 120.14 mm |
| September | 9.7 °C | 22.3 °C | 127.25 mm |
| October | 3.8 °C | 15.6 °C | 144.02 mm |
| November | -1.4 °C | 8.9 °C | 105.16 mm |
| December | -6.3 °C | 3.2 °C | 125.48 mm |
| Annual | 2.5 °C | 14.2 °C | 1384.06 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 11 - May 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 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |