| 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 | Plymouth | Massachusetts | National |
| Air quality index | 36 | 40 | 42 |
| Pollution index | 9,737,620 | 8,399,610 | 2,726,193 |
| Measurement | Total |
| Days measured | 359 |
| Days with good air quality | 348 |
| Days with moderate air quality | 11 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| 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% |
| Weweantic, MA | 1,287 | 36 | 28.0% |
| Sandwich, MA | 2,928 | 36 | 28.0% |
| Onset, MA | 1,049 | 36 | 28.0% |
| White Island Shores, MA | 2,409 | 36 | 28.0% |
| Plymouth, MA | 6,949 | 36 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| Asbestos, QC | 6,948 | n/a | |
| Selma, NC | 6,950 | 40 | 20.0% |
| Huntingdon, PA | 6,950 | 41 | 18.0% |
| Marshall, MI | 6,947 | 38 | 24.0% |
| Oakdale, NY | 6,947 | 43 | 14.0% |
| Plymouth, MA | 6,949 | 36 | 28.0% |
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