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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 | Conning Towers Nautilus Park | 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. | 
| Colchester, CT | 5,147 | 33 | 34.0% | 
| Norwich, CT | 39,112 | 37 | 26.0% | 
| Gales Ferry, CT | 1,093 | 37 | 26.0% | 
| Westerly, RI | 17,842 | 37 | 26.0% | 
| New London, CT | 27,001 | 37 | 26.0% | 
| Conning Towers Nautilus Park, CT | 9,606 | 37 | 26.0% | 
| City | Population | Air Quality Index | National Avg. | 
| Picnic Point, WA | 9,607 | 45 | 10.0% | 
| Brookdale, NJ | 9,604 | 51 | 2.0% | 
| Arnprior, ON | 9,608 | n/a | |
| St. Pete Beach, FL | 9,603 | 38 | 24.0% | 
| Howell, MI | 9,610 | 40 | 20.0% | 
| Conning Towers Nautilus Park, CT | 9,606 | 37 | 26.0% |