Hardwick, Massachusetts has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 36.9 °F (low) to 57.6 °F (high). Annual precipitation averages 48.1 Inches. Hardwick is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 14.1 °F | 32.5 °F | 3.63 in. |
| February | 14.9 °F | 35.4 °F | 3.29 in. |
| March | 23.4 °F | 43.2 °F | 4.06 in. |
| April | 33.9 °F | 56.4 °F | 3.75 in. |
| May | 44.7 °F | 67.4 °F | 3.57 in. |
| June | 54.1 °F | 76.2 °F | 4.3 in. |
| July | 59.9 °F | 81.7 °F | 4.18 in. |
| August | 58.0 °F | 80.0 °F | 4.44 in. |
| September | 50.3 °F | 72.5 °F | 4.35 in. |
| October | 39.0 °F | 59.7 °F | 4.68 in. |
| November | 29.7 °F | 48.1 °F | 3.66 in. |
| December | 21.0 °F | 37.9 °F | 4.22 in. |
| Annual | 36.9 °F | 57.6 °F | 48.13 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |