| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 21°F | 40°F | 30°F | 3.7" |
| February | 21°F | 41°F | 31°F | 3.5" |
| March | 28°F | 49°F | 38°F | 4.7" |
| April | 37°F | 61°F | 49°F | 4.5" |
| May | 47°F | 71°F | 59°F | 3.5" |
| June | 55°F | 79°F | 67°F | 4.9" |
| July | 62°F | 85°F | 73°F | 4.1" |
| August | 58°F | 83°F | 71°F | 3.4" |
| September | 52°F | 76°F | 64°F | 4.1" |
| October | 42°F | 66°F | 54°F | 5.2" |
| November | 33°F | 55°F | 44°F | 3.9" |
| December | 26°F | 46°F | 36°F | 4.8" |
| Index | Bridgewater | Massachusetts | National |
| Air quality index | 43 | 40 | 42 |
| Pollution index | 9,737,620 | 8,399,610 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 291 |
| Days with moderate air quality | 73 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| 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. |
| North Plymouth, MA | 4,258 | 36 | 28.0% |
| West Wareham, MA | 2,398 | 36 | 28.0% |
| Marshfield Hills, MA | 2,389 | 43 | 14.0% |
| Sharon, MA | 6,217 | 43 | 14.0% |
| Duxbury, MA | 1,723 | 43 | 14.0% |
| Bridgewater, MA | 8,544 | 43 | 14.0% |
| City | Population | Air Quality Index | National Avg. |
| Manteno, IL | 8,545 | 55 | 10.0% |
| Helena Valley Southeast, MT | 8,546 | 40 | 20.0% |
| Dayton, TX | 8,546 | 52 | 4.0% |
| Lake Park, FL | 8,541 | 36 | 28.0% |
| Port Jervis, NY | 8,541 | 34 | 32.0% |
| Bridgewater, MA | 8,544 | 43 | 14.0% |
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