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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 19°F | 38°F | 28°F | 3.1" |
| February | 19°F | 39°F | 29°F | 2.9" |
| March | 28°F | 48°F | 38°F | 3.8" |
| April | 38°F | 61°F | 49°F | 3.7" |
| May | 47°F | 71°F | 59°F | 3.8" |
| June | 57°F | 78°F | 67°F | 4.7" |
| July | 62°F | 84°F | 73°F | 5.0" |
| August | 60°F | 81°F | 70°F | 4.8" |
| September | 53°F | 76°F | 64°F | 4.2" |
| October | 43°F | 65°F | 53°F | 4.4" |
| November | 32°F | 53°F | 42°F | 3.0" |
| December | 25°F | 43°F | 34°F | 4.8" |
| Index | Wilton Center | Connecticut | National |
| Air quality index | 43 | 43 | 42 |
| Pollution index | 16,950,700 | 8,629,883 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 262 |
| Days with moderate air quality | 82 |
| Days w/ poor A.Q. for sensitive groups | 18 |
| Days with unhealthy air quality | 3 |
| Pollutant | Total |
| Arsenic | 0.030% |
| Benzene | 0.140% |
| Carbon Tetrachloride | 0.070% |
| Lead | 0.080% |
| Mercury | 0.030% |
| City | Population | Air Quality Index | National Avg. |
| Heritage Hills, NY | 4,309 | 36 | 28.0% |
| Brewster, NY | 2,257 | 36 | 28.0% |
| Cannondale, CT | 440 | 43 | 14.0% |
| Greenwich, CT | 12,967 | 43 | 14.0% |
| Riverside, CT | 8,855 | 43 | 14.0% |
| Wilton Center, CT | 1,808 | 43 | 14.0% |
| City | Population | Air Quality Index | National Avg. |
| Hill City, KS | 1,808 | 19 | 62.0% |
| The Hideout, PA | 1,808 | 38 | 24.0% |
| Browns Lake, WI | 1,808 | 39 | 22.0% |
| Teutopolis, IL | 1,807 | 40 | 20.0% |
| Kentland, IN | 1,809 | 42 | 16.0% |
| Wilton Center, CT | 1,808 | 43 | 14.0% |
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