Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
January | 46°F | 72°F | 57°F | 2.3" |
February | 48°F | 72°F | 58°F | 1.7" |
March | 51°F | 75°F | 61°F | 1.0" |
April | 54°F | 76°F | 64°F | 0.5" |
May | 58°F | 78°F | 66°F | 0.3" |
June | 62°F | 81°F | 70°F | 0.0" |
July | 66°F | 86°F | 74°F | 0.1" |
August | 66°F | 88°F | 75°F | 0.0" |
September | 65°F | 88°F | 74°F | 0.2" |
October | 59°F | 83°F | 69°F | 0.4" |
November | 52°F | 77°F | 63°F | 0.6" |
December | 45°F | 70°F | 56°F | 2.5" |
Index | Norwalk | California | National |
Air quality index | 72 | 55 | 42 |
Pollution index | 139,490,000 | 10,473,190 | 2,726,193 |
Measurement | Total |
Days measured | 365 |
Days with good air quality | 66 |
Days with moderate air quality | 208 |
Days w/ poor A.Q. for sensitive groups | 62 |
Days with unhealthy air quality | 28 |
Pollutant | Total |
Arsenic | 0.200% |
Benzene | 0.950% |
Carbon Tetrachloride | 0.080% |
Lead | 1.320% |
Mercury | 0.440% |
City | Population | Air Quality Index | National Avg. |
Industry, CA | 264 | 72 | 44.0% |
South San Jose Hills, CA | 19,104 | 72 | 44.0% |
West Covina, CA | 105,808 | 72 | 44.0% |
Los Angeles, CA | 3,973,278 | 72 | 44.0% |
Willowbrook, CA | 24,401 | 72 | 44.0% |
Norwalk, CA | 104,524 | 72 | 44.0% |
City | Population | Air Quality Index | National Avg. |
Green Bay, WI | 104,508 | 36 | 28.0% |
Wichita Falls, TX | 104,657 | 26 | 48.0% |
Clarington, ON | 104,855 | n/a | |
San Tan Valley, AZ | 104,936 | 74 | 48.0% |
Allen, TX | 104,040 | 51 | 2.0% |
Norwalk, CA | 104,524 | 72 | 44.0% |