| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 24°F | 41°F | 33°F | 3.3" |
| February | 24°F | 41°F | 33°F | 2.8" |
| March | 29°F | 47°F | 38°F | 3.1" |
| April | 38°F | 57°F | 47°F | 3.5" |
| May | 47°F | 67°F | 57°F | 3.6" |
| June | 55°F | 74°F | 65°F | 3.5" |
| July | 63°F | 81°F | 72°F | 3.5" |
| August | 60°F | 80°F | 70°F | 3.5" |
| September | 54°F | 74°F | 64°F | 3.6" |
| October | 46°F | 65°F | 56°F | 5.1" |
| November | 37°F | 55°F | 47°F | 3.9" |
| December | 30°F | 47°F | 39°F | 4.3" |
| Index | Edgartown | Massachusetts | National |
| Air quality index | 36 | 40 | 42 |
| Pollution index | 7,903,830 | 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 | 0.060% |
| Benzene | 0.070% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.080% |
| Mercury | 0.030% |
| City | Population | Air Quality Index | National Avg. |
| Monomoscoy Island, MA | 114 | 36 | 28.0% |
| Seabrook, MA | 520 | 36 | 28.0% |
| West Falmouth, MA | 1,836 | 36 | 28.0% |
| New Seabury, MA | 595 | 36 | 28.0% |
| Seconsett Island, MA | 37 | 36 | 28.0% |
| Edgartown, MA | 517 | 36 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| Garfield, AR | 517 | 44 | 12.0% |
| Mesquite Creek, AZ | 517 | 13 | 74.0% |
| Reddick, FL | 517 | 38 | 24.0% |
| Burt, IA | 517 | 15 | 70.0% |
| Fillmore, IN | 517 | 54 | 8.0% |
| Edgartown, MA | 517 | 36 | 28.0% |
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