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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 31°F | 39°F | 36°F | 4.2" |
| February | 30°F | 40°F | 35°F | 3.0" |
| March | 36°F | 46°F | 41°F | 6.5" |
| April | 45°F | 56°F | 51°F | 7.6" |
| May | 55°F | 65°F | 60°F | 6.6" |
| June | 63°F | 73°F | 68°F | 3.1" |
| July | 69°F | 79°F | 75°F | 5.8" |
| August | 67°F | 78°F | 73°F | 6.3" |
| September | 63°F | 72°F | 68°F | 8.5" |
| October | 54°F | 63°F | 59°F | 13.5" |
| November | 44°F | 53°F | 49°F | 7.3" |
| December | 35°F | 44°F | 40°F | 6.0" |
| Index | Shelter Island | New York | National |
| Air quality index | 37 | 43 | 42 |
| Pollution index | 4,117,250 | 6,179,275 | 2,726,193 |
| Measurement | Total |
| Days measured | 364 |
| Days with good air quality | 323 |
| Days with moderate air quality | 34 |
| Days w/ poor A.Q. for sensitive groups | 7 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.010% |
| Benzene | 0.050% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.010% |
| Mercury | 0.010% |
| City | Population | Air Quality Index | National Avg. |
| Sag Harbor, NY | 1,959 | 37 | 26.0% |
| Wainscott, NY | 342 | 37 | 26.0% |
| East Hampton North, NY | 4,180 | 37 | 26.0% |
| East Marion, NY | 1,144 | 37 | 26.0% |
| Fishers Island, NY | 61 | 37 | 26.0% |
| Shelter Island, NY | 1,980 | 37 | 26.0% |
| City | Population | Air Quality Index | National Avg. |
| Tavernier, FL | 1,980 | 41 | 18.0% |
| Hollandale, MS | 1,980 | 43 | 14.0% |
| River Heights, UT | 1,980 | 44 | 12.0% |
| Ocean Park, WA | 1,980 | 20 | 60.0% |
| Cross Lake 19A, MB | 1,980 | n/a | |
| Shelter Island, NY | 1,980 | 37 | 26.0% |
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