| 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 | Stratford | Connecticut | National |
| Air quality index | 43 | 43 | 42 |
| Pollution index | 14,500,300 | 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 | 0.050% |
| Lead | 0.080% |
| Mercury | 0.060% |
| City | Population | Air Quality Index | National Avg. |
| North Haven, CT | 23,665 | 41 | 18.0% |
| West Haven, CT | 54,666 | 41 | 18.0% |
| Woodmont, CT | 1,601 | 41 | 18.0% |
| Derby, CT | 12,420 | 41 | 18.0% |
| East Haven, CT | 28,645 | 41 | 18.0% |
| Stratford, CT | 52,300 | 43 | 14.0% |
| City | Population | Air Quality Index | National Avg. |
| Olympia, WA | 52,290 | 30 | 40.0% |
| Edina, MN | 52,215 | 46 | 8.0% |
| Mascouche, QC | 52,212 | n/a | |
| Watsonville, CA | 52,398 | 35 | 30.0% |
| Queen Creek, AZ | 52,162 | 74 | 48.0% |
| Stratford, CT | 52,300 | 43 | 14.0% |
Here are the best places to live in Connecticut
Check out the 10 safest cities in Connecticut
See the best places to live in Stratford
Most Dangerous States In The US