| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 22°F | 39°F | 30°F | 6.2" |
| February | 20°F | 38°F | 29°F | 4.3" |
| March | 25°F | 45°F | 36°F | 10.4" |
| April | 36°F | 57°F | 46°F | 10.0" |
| May | 45°F | 65°F | 54°F | 8.0" |
| June | 56°F | 77°F | 65°F | 2.6" |
| July | 61°F | 82°F | 71°F | 2.4" |
| August | 60°F | 83°F | 71°F | 7.8" |
| September | 53°F | 77°F | 65°F | 5.4" |
| October | 46°F | 65°F | 55°F | 10.5" |
| November | 33°F | 54°F | 44°F | 7.8" |
| December | 25°F | 41°F | 32°F | 5.0" |
| Index | Mattapoisett Center | 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. |
| Bourne, MA | 1,377 | 36 | 28.0% |
| Falmouth, MA | 3,751 | 36 | 28.0% |
| Teaticket, MA | 1,608 | 36 | 28.0% |
| West Wareham, MA | 2,398 | 36 | 28.0% |
| Buzzards Bay, MA | 3,208 | 36 | 28.0% |
| Mattapoisett Center, MA | 3,193 | 36 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| Cloverdale, VA | 3,193 | 38 | 24.0% |
| Tipton, IA | 3,192 | 35 | 30.0% |
| West Wyomissing, PA | 3,192 | 42 | 16.0% |
| Saint-Anaclet-de-Lessard, QC | 3,192 | n/a | |
| Haskell, TX | 3,194 | 26 | 48.0% |
| Mattapoisett Center, MA | 3,193 | 36 | 28.0% |
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