| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 23°F | 41°F | 32°F | 3.3" |
| February | 23°F | 42°F | 32°F | 3.6" |
| March | 30°F | 50°F | 39°F | 4.0" |
| April | 41°F | 62°F | 50°F | 4.3" |
| May | 50°F | 71°F | 59°F | 3.9" |
| June | 60°F | 80°F | 69°F | 4.9" |
| July | 67°F | 85°F | 76°F | 3.5" |
| August | 66°F | 84°F | 74°F | 4.2" |
| September | 59°F | 78°F | 68°F | 3.8" |
| October | 48°F | 67°F | 57°F | 4.7" |
| November | 38°F | 56°F | 47°F | 3.0" |
| December | 29°F | 46°F | 38°F | 5.4" |
| Index | Shelton | Connecticut | National |
| Air quality index | 41 | 43 | 42 |
| Pollution index | 14,500,300 | 8,629,883 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 280 |
| Days with moderate air quality | 71 |
| Days w/ poor A.Q. for sensitive groups | 12 |
| Days with unhealthy air quality | 2 |
| Pollutant | Total |
| Arsenic | 0.030% |
| Benzene | 0.140% |
| Carbon Tetrachloride | 0.050% |
| Lead | 0.080% |
| Mercury | 0.060% |
| City | Population | Air Quality Index | National Avg. |
| Naugatuck, CT | 31,201 | 41 | 18.0% |
| Derby, CT | 12,420 | 41 | 18.0% |
| East Haven, CT | 28,645 | 41 | 18.0% |
| Woodmont, CT | 1,601 | 41 | 18.0% |
| Wallingford Center, CT | 18,948 | 41 | 18.0% |
| Shelton, CT | 41,162 | 41 | 18.0% |
| City | Population | Air Quality Index | National Avg. |
| Kearny, NJ | 41,190 | 51 | 2.0% |
| Moline, IL | 41,213 | 46 | 8.0% |
| Weslaco, TX | 41,103 | 42 | 16.0% |
| Findlay, OH | 41,098 | 39 | 22.0% |
| Greenacres, FL | 41,242 | 36 | 28.0% |
| Shelton, CT | 41,162 | 41 | 18.0% |
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