| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 21°F | 40°F | 30°F | 3.6" |
| February | 21°F | 40°F | 30°F | 2.9" |
| March | 28°F | 47°F | 37°F | 4.2" |
| April | 38°F | 58°F | 47°F | 4.3" |
| May | 47°F | 69°F | 57°F | 3.7" |
| June | 56°F | 77°F | 66°F | 4.7" |
| July | 63°F | 84°F | 73°F | 4.2" |
| August | 61°F | 82°F | 71°F | 3.5" |
| September | 55°F | 75°F | 64°F | 4.1" |
| October | 45°F | 65°F | 54°F | 5.4" |
| November | 35°F | 54°F | 44°F | 4.4" |
| December | 27°F | 45°F | 36°F | 4.5" |
| Index | Marshfield | Massachusetts | National |
| Air quality index | 43 | 40 | 42 |
| Pollution index | 24,018,000 | 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 | 0.030% |
| Benzene | 0.220% |
| Carbon Tetrachloride | 0.100% |
| Lead | 0.280% |
| Mercury | 0.130% |
| City | Population | Air Quality Index | National Avg. |
| North Plymouth, MA | 4,258 | 36 | 28.0% |
| The Pinehills, MA | 4,531 | 36 | 28.0% |
| Plymouth, MA | 6,949 | 36 | 28.0% |
| Marshfield Hills, MA | 2,389 | 43 | 14.0% |
| Weymouth Town, MA | 57,213 | 43 | 14.0% |
| Marshfield, MA | 5,190 | 43 | 14.0% |
| City | Population | Air Quality Index | National Avg. |
| Port LaBelle, FL | 5,189 | 36 | 28.0% |
| Springfield, MI | 5,188 | 38 | 24.0% |
| Kings, Subd. D, NS | 5,188 | n/a | |
| Glendale, CO | 5,186 | 58 | 16.0% |
| LaBelle, FL | 5,186 | 36 | 28.0% |
| Marshfield, MA | 5,190 | 43 | 14.0% |
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