Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
January | 23°F | 39°F | 30°F | 3.0" |
February | 23°F | 40°F | 31°F | 2.6" |
March | 30°F | 49°F | 39°F | 3.5" |
April | 41°F | 62°F | 50°F | 4.2" |
May | 50°F | 71°F | 60°F | 4.2" |
June | 60°F | 79°F | 69°F | 5.1" |
July | 66°F | 84°F | 74°F | 4.4" |
August | 64°F | 82°F | 72°F | 4.2" |
September | 57°F | 77°F | 66°F | 4.3" |
October | 47°F | 65°F | 55°F | 5.1" |
November | 37°F | 54°F | 45°F | 3.1" |
December | 29°F | 44°F | 36°F | 4.5" |
Index | Norwalk | 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. |
Byram, CT | 4,855 | 43 | 14.0% |
Rye Brook, NY | 9,554 | 43 | 14.0% |
Cos Cob, CT | 7,065 | 43 | 14.0% |
Old Greenwich, CT | 6,980 | 43 | 14.0% |
Stamford, CT | 130,057 | 43 | 14.0% |
Norwalk, CT | 88,755 | 43 | 14.0% |
City | Population | Air Quality Index | National Avg. |
Newmarket, ON | 88,702 | n/a | |
Nashua, NH | 89,052 | 37 | 26.0% |
Conroe, TX | 88,369 | 52 | 4.0% |
Chino, CA | 89,170 | 89 | 78.0% |
Reading, PA | 88,333 | 42 | 16.0% |
Norwalk, CT | 88,755 | 43 | 14.0% |