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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 23°F | 40°F | 32°F | 2.5" |
| February | 23°F | 40°F | 32°F | 2.1" |
| March | 30°F | 47°F | 38°F | 3.3" |
| April | 39°F | 58°F | 48°F | 3.1" |
| May | 48°F | 66°F | 57°F | 3.6" |
| June | 58°F | 75°F | 66°F | 3.6" |
| July | 65°F | 81°F | 72°F | 2.8" |
| August | 63°F | 80°F | 71°F | 3.0" |
| September | 57°F | 75°F | 66°F | 3.3" |
| October | 47°F | 65°F | 56°F | 4.4" |
| November | 37°F | 55°F | 46°F | 2.9" |
| December | 29°F | 46°F | 37°F | 3.4" |
| Index | Fishers 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. |
| Mashantucket, CT | 225 | 37 | 26.0% |
| Gales Ferry, CT | 1,093 | 37 | 26.0% |
| Bradford, RI | 1,265 | 37 | 26.0% |
| New London, CT | 27,001 | 37 | 26.0% |
| Long Hill, CT | 8,315 | 37 | 26.0% |
| Fishers Island, NY | 61 | 37 | 26.0% |
| City | Population | Air Quality Index | National Avg. |
| Klukwan, AK | 61 | 20 | 60.0% |
| Jennette, AR | 61 | 45 | 10.0% |
| Yucca, AZ | 61 | 13 | 74.0% |
| Mount Hebron, CA | 61 | 29 | 42.0% |
| Rodriguez Camp, CA | 61 | 67 | 34.0% |
| Fishers Island, NY | 61 | 37 | 26.0% |
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