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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 | Niantic | Connecticut | National |
| Air quality index | 37 | 43 | 42 |
| Pollution index | 4,117,250 | 8,629,883 | 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. |
| Orient, NY | 1,023 | 37 | 26.0% |
| Chester Center, CT | 1,731 | 37 | 26.0% |
| Old Mystic, CT | 3,302 | 37 | 26.0% |
| New London, CT | 27,001 | 37 | 26.0% |
| Essex Village, CT | 2,757 | 37 | 26.0% |
| Niantic, CT | 3,083 | 37 | 26.0% |
| City | Population | Air Quality Index | National Avg. |
| Wilder, KY | 3,083 | 54 | 8.0% |
| Calera, OK | 3,082 | 325 | 550.0% |
| Thurso, QC | 3,084 | n/a | |
| Bishop, TX | 3,085 | 30 | 40.0% |
| Chandler, TX | 3,085 | 36 | 28.0% |
| Niantic, CT | 3,083 | 37 | 26.0% |
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