Clinton, Massachusetts has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 38.5 °F (low) to 59.3 °F (high). Annual precipitation averages 49.8 Inches. Clinton is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 15.6 °F | 34.5 °F | 3.8 in. |
| February | 17.1 °F | 37.1 °F | 3.35 in. |
| March | 25.1 °F | 44.8 °F | 4.48 in. |
| April | 35.7 °F | 57.7 °F | 4.26 in. |
| May | 46.4 °F | 68.6 °F | 3.66 in. |
| June | 55.9 °F | 77.2 °F | 4.34 in. |
| July | 61.6 °F | 82.9 °F | 3.89 in. |
| August | 60.0 °F | 81.4 °F | 4.41 in. |
| September | 51.7 °F | 74.5 °F | 4.13 in. |
| October | 40.3 °F | 62.2 °F | 4.96 in. |
| November | 30.6 °F | 50.8 °F | 3.89 in. |
| December | 22.1 °F | 40.3 °F | 4.6 in. |
| Annual | 38.5 °F | 59.3 °F | 49.77 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| 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 |