| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 22°F | 39°F | 30°F | 5.6" |
| February | 20°F | 38°F | 28°F | 4.7" |
| March | 25°F | 46°F | 36°F | 11.5" |
| April | 36°F | 59°F | 47°F | 9.6" |
| May | 45°F | 68°F | 56°F | 5.5" |
| June | 57°F | 81°F | 68°F | 4.6" |
| July | 62°F | 85°F | 73°F | 5.2" |
| August | 62°F | 87°F | 74°F | 4.0" |
| September | 55°F | 80°F | 67°F | 5.8" |
| October | 48°F | 68°F | 57°F | 10.4" |
| November | 32°F | 56°F | 45°F | 5.1" |
| December | 24°F | 41°F | 32°F | 6.8" |
| Index | Somerset | Massachusetts | National |
| Air quality index | 44 | 40 | 42 |
| Pollution index | 9,737,620 | 8,399,610 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 289 |
| Days with moderate air quality | 74 |
| Days w/ poor A.Q. for sensitive groups | 2 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.180% |
| Benzene | 0.070% |
| Carbon Tetrachloride | 0.040% |
| Lead | 0.170% |
| Mercury | 0.140% |
| City | Population | Air Quality Index | National Avg. |
| Attleboro, MA | 45,023 | 44 | 12.0% |
| Raynham Center, MA | 4,561 | 44 | 12.0% |
| Valley Falls, RI | 11,548 | 44 | 12.0% |
| Acushnet Center, MA | 3,403 | 44 | 12.0% |
| North Lakeville, MA | 3,226 | 44 | 12.0% |
| Somerset, MA | 18,160 | 44 | 12.0% |
| City | Population | Air Quality Index | National Avg. |
| Nipomo, CA | 18,182 | 46 | 8.0% |
| Maumelle, AR | 18,193 | 45 | 10.0% |
| Newburyport, MA | 18,197 | 37 | 26.0% |
| Burlington, KY | 18,203 | 54 | 8.0% |
| Buckhall, VA | 18,116 | 47 | 6.0% |
| Somerset, MA | 18,160 | 44 | 12.0% |
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