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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. |
| Brewster, NY | 2,327 | 36 | 28.0% |
| Heritage Hills, NY | 4,412 | 36 | 28.0% |
| Glenville, CT | 3,040 | 43 | 14.0% |
| Darien, CT | 22,334 | 43 | 14.0% |
| Old Greenwich, CT | 7,189 | 43 | 14.0% |
| Wilton Center, CT | 1,875 | 43 | 14.0% |
| City | Population | Air Quality Index | National Avg. |
| Hill City, KS | 1,875 | 19 | 62.0% |
| Fort Plain, NY | 1,875 | 27 | 46.0% |
| Wynnewood, OK | 1,875 | 43 | 14.0% |
| Division No. 1, Subd. G, NL | 1,875 | n/a | |
| Mathews, LA | 1,874 | 41 | 18.0% |
| Wilton Center, CT | 1,875 | 43 | 14.0% |
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