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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 21°F | 35°F | 28°F | 1.6" |
| February | 22°F | 38°F | 29°F | 1.0" |
| March | 30°F | 48°F | 38°F | 1.3" |
| April | 41°F | 63°F | 51°F | 4.8" |
| May | 52°F | 72°F | 61°F | 5.5" |
| June | 60°F | 79°F | 68°F | 2.9" |
| July | 65°F | 84°F | 73°F | 0.1" |
| August | 63°F | 81°F | 71°F | 1.8" |
| September | 58°F | 76°F | 65°F | 0.1" |
| October | 46°F | 62°F | 53°F | 2.3" |
| November | 36°F | 52°F | 43°F | 1.8" |
| December | 28°F | 40°F | 33°F | 1.7" |
| Index | Lakeville | Connecticut | National |
| Air quality index | 37 | 43 | 42 |
| Pollution index | 161,427 | 8,629,883 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 342 |
| Days with moderate air quality | 23 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.002% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Millbrook, NY | 1,342 | 36 | 28.0% |
| Amenia, NY | 974 | 36 | 28.0% |
| Pine Plains, NY | 1,168 | 36 | 28.0% |
| Sharon, CT | 635 | 37 | 26.0% |
| Canaan, CT | 1,230 | 37 | 26.0% |
| Lakeville, CT | 830 | 37 | 26.0% |
| City | Population | Air Quality Index | National Avg. |
| Shalimar, FL | 830 | 31 | 38.0% |
| Rhine, GA | 830 | 26 | 48.0% |
| Stafford, KS | 830 | 40 | 20.0% |
| Cardwell, MO | 830 | 26 | 48.0% |
| Loudon, NH | 830 | 27 | 46.0% |
| Lakeville, CT | 830 | 37 | 26.0% |
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