| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 27°F | 42°F | 35°F | 3.7" |
| February | 26°F | 42°F | 34°F | 4.2" |
| March | 29°F | 45°F | 37°F | 3.7" |
| April | 39°F | 55°F | 46°F | 3.7" |
| May | 47°F | 63°F | 55°F | 3.3" |
| June | 55°F | 71°F | 62°F | 2.7" |
| July | 63°F | 78°F | 69°F | 2.9" |
| August | 62°F | 77°F | 70°F | 3.1" |
| September | 57°F | 73°F | 65°F | 3.8" |
| October | 50°F | 65°F | 58°F | 5.0" |
| November | 40°F | 55°F | 47°F | 4.1" |
| December | 33°F | 49°F | 41°F | 4.9" |
| Index | Siasconset | 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. |
| Madaket, MA | 291 | 36 | 28.0% |
| Nantucket, MA | 8,606 | 36 | 28.0% |
| Siasconset, MA | 89 | 36 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| Chuathbaluk, AK | 89 | 31 | 38.0% |
| Allport, AR | 89 | 45 | 10.0% |
| South Lead Hill, AR | 89 | 36 | 28.0% |
| Rockingham, GA | 89 | 26 | 48.0% |
| Jackson Junction, IA | 89 | 39 | 22.0% |
| Siasconset, MA | 89 | 36 | 28.0% |
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