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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 20°F | 39°F | 29°F | 2.7" |
| February | 20°F | 40°F | 30°F | 2.9" |
| March | 28°F | 49°F | 38°F | 3.1" |
| April | 39°F | 63°F | 50°F | 3.6" |
| May | 48°F | 73°F | 60°F | 3.5" |
| June | 57°F | 80°F | 68°F | 5.1" |
| July | 64°F | 86°F | 74°F | 4.1" |
| August | 61°F | 83°F | 72°F | 4.2" |
| September | 54°F | 78°F | 65°F | 3.2" |
| October | 43°F | 66°F | 54°F | 4.1" |
| November | 33°F | 55°F | 43°F | 3.2" |
| December | 26°F | 44°F | 35°F | 4.0" |
| Index | Chester Center | 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% |
| Essex Village, CT | 2,757 | 37 | 26.0% |
| Fenwick, CT | 44 | 37 | 26.0% |
| Old Saybrook Center, CT | 1,984 | 37 | 26.0% |
| Moodus, CT | 1,802 | 37 | 26.0% |
| Chester Center, CT | 1,731 | 37 | 26.0% |
| City | Population | Air Quality Index | National Avg. |
| Winterville, GA | 1,731 | 44 | 12.0% |
| Union City, MI | 1,731 | 38 | 24.0% |
| Bismarck, MO | 1,731 | 54 | 8.0% |
| Avon-by-the-Sea, NJ | 1,731 | 51 | 2.0% |
| Lot 1, PE | 1,731 | n/a | |
| Chester Center, CT | 1,731 | 37 | 26.0% |