| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 20°F | 37°F | 28°F | 5.1" |
| February | 17°F | 36°F | 26°F | 3.8" |
| March | 23°F | 45°F | 34°F | 6.5" |
| April | 36°F | 60°F | 47°F | 11.5" |
| May | 45°F | 69°F | 57°F | 3.6" |
| June | 57°F | 81°F | 68°F | 3.5" |
| July | 62°F | 83°F | 72°F | 3.9" |
| August | 60°F | 84°F | 72°F | 2.8" |
| September | 52°F | 79°F | 65°F | 4.3" |
| October | 46°F | 66°F | 55°F | 10.9" |
| November | 31°F | 53°F | 42°F | 5.4" |
| December | 21°F | 38°F | 29°F | 5.4" |
| Index | Mansfield Center | 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. |
| South Coventry, CT | 1,142 | 33 | 34% |
| South Windham, CT | 1,330 | 33 | 34% |
| Brooklyn, CT | 906 | 33 | 34% |
| Storrs, CT | 16,059 | 33 | 34% |
| Coventry Lake, CT | 3,166 | 33 | 34% |
| Mansfield Center, CT | 969 | 33 | 34% |
| City, State | Population | Air Quality Index | National Avg. |
| West Pelzer, SC | 969 | 31 | 38% |
| Ruston, WA | 969 | 18 | 64% |
| Sterling City, TX | 969 | 28 | 44% |
| Piney View, WV | 969 | 295 | 490% |
| Towaoc, CO | 969 | 49 | 2% |
| Mansfield Center, CT | 969 | 33 | 34% |
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