| 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% |
Here are the best places to live in Connecticut
These are the largest cities in Connecticut
Check out the 10 most dangerous cities in Connecticut
Check out the 10 safest cities in Connecticut