Granville, Massachusetts has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 36.4 °F (low) to 57.6 °F (high). Annual precipitation averages 54.5 Inches. 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 | 14.1 °F | 32.5 °F | 3.82 in. |
| February | 15.3 °F | 35.3 °F | 3.52 in. |
| March | 23.1 °F | 43.3 °F | 4.37 in. |
| April | 33.7 °F | 57.0 °F | 4.35 in. |
| May | 44.2 °F | 68.3 °F | 4.29 in. |
| June | 53.5 °F | 76.2 °F | 5.06 in. |
| July | 58.4 °F | 81.1 °F | 4.59 in. |
| August | 56.7 °F | 79.4 °F | 4.73 in. |
| September | 49.4 °F | 72.2 °F | 5.01 in. |
| October | 38.8 °F | 60.1 °F | 5.67 in. |
| November | 29.4 °F | 48.0 °F | 4.14 in. |
| December | 20.7 °F | 37.7 °F | 4.94 in. |
| Annual | 36.4 °F | 57.6 °F | 54.49 in. |
| 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 : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |