| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | -12°F | 70°F | 29°F | 3.2" |
| February | -2°F | 60°F | 29°F | 2.8" |
| March | 1°F | 68°F | 36°F | 3.0" |
| April | 21°F | 90°F | 49°F | 4.9" |
| May | 28°F | 90°F | 57°F | 2.9" |
| June | 39°F | 97°F | 67°F | 4.5" |
| July | 47°F | 95°F | 72°F | 3.8" |
| August | 47°F | 97°F | 71°F | 2.3" |
| September | 37°F | 90°F | 63°F | 3.3" |
| October | 24°F | 84°F | 53°F | 5.5" |
| November | 14°F | 73°F | 44°F | 3.7" |
| December | -6°F | 68°F | 33°F | 4.3" |
| Index | East Brooklyn | Connecticut | National |
| Air quality index | 33 | 43 | 50 |
| Pollution index | 2,806,150 | 7,127,531 | 5,066,862 |
| Measurement | Total |
| Days measured | 334 |
| Days with good air quality | 319 |
| Days with moderate air quality | 14 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality |
| Pollutant | Total |
| Arsenic | 0.004% |
| Benzene | 0.030% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.040% |
| Mercury | 0.010% |
| City, State | Population | Air Quality Index | National Avg. |
| Mansfield Center, CT | 969 | 33 | 34% |
| Putnam, CT | 7,129 | 33 | 34% |
| Brooklyn, CT | 906 | 33 | 34% |
| South Windham, CT | 1,330 | 33 | 34% |
| Danielson, CT | 3,999 | 33 | 34% |
| East Brooklyn, CT | 1,722 | 33 | 34% |
| City, State | Population | Air Quality Index | National Avg. |
| East Millinocket, ME | 1,722 | 31 | 38% |
| Granby, CO | 1,722 | 42 | 16% |
| Marble Hill, MO | 1,721 | 36 | 28% |
| South Amherst, OH | 1,723 | 55 | 10% |
| Harwich Port, MA | 1,721 | 33 | 34% |
| East Brooklyn, CT | 1,722 | 33 | 34% |