Sunderland, Massachusetts has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 36 °F (low) to 57.2 °F (high). Annual precipitation averages 49.7 Inches. Sunderland 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 | 12.4 °F | 31.5 °F | 3.46 in. |
| February | 13.9 °F | 34.5 °F | 3.15 in. |
| March | 22.3 °F | 42.9 °F | 3.8 in. |
| April | 33.3 °F | 56.1 °F | 3.99 in. |
| May | 44.3 °F | 67.5 °F | 3.75 in. |
| June | 53.7 °F | 76.2 °F | 4.91 in. |
| July | 59.1 °F | 81.7 °F | 4.26 in. |
| August | 57.2 °F | 79.9 °F | 4.76 in. |
| September | 49.5 °F | 72.7 °F | 4.8 in. |
| October | 38.4 °F | 59.3 °F | 5.0 in. |
| November | 28.7 °F | 47.5 °F | 3.63 in. |
| December | 19.4 °F | 36.8 °F | 4.2 in. |
| Annual | 36 °F | 57.2 °F | 49.71 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 | Moderate Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |