Somerset, Massachusetts has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 43.2 °F (low) to 60.3 °F (high). Annual precipitation averages 50.6 Inches. Somerset is located in USDA Plant Hardiness Zone 7a. 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 | 21.8 °F | 38.3 °F | 4.28 in. |
| February | 22.9 °F | 39.9 °F | 3.62 in. |
| March | 29.6 °F | 46.4 °F | 5.4 in. |
| April | 39.6 °F | 57.4 °F | 4.53 in. |
| May | 48.7 °F | 67.8 °F | 3.53 in. |
| June | 58.8 °F | 76.5 °F | 4.0 in. |
| July | 65.2 °F | 82.4 °F | 3.51 in. |
| August | 64.0 °F | 81.1 °F | 3.69 in. |
| September | 56.9 °F | 74.4 °F | 3.96 in. |
| October | 45.8 °F | 63.1 °F | 4.76 in. |
| November | 36.4 °F | 52.8 °F | 4.37 in. |
| December | 28.1 °F | 43.6 °F | 4.92 in. |
| Annual | 43.2 °F | 60.3 °F | 50.57 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 7a : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |