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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 46°F | 70°F | 57°F | 2.6" |
| February | 48°F | 70°F | 58°F | 2.5" |
| March | 51°F | 72°F | 60°F | 1.0" |
| April | 53°F | 74°F | 62°F | 0.6" |
| May | 57°F | 75°F | 65°F | 0.3" |
| June | 61°F | 78°F | 67°F | 0.0" |
| July | 65°F | 83°F | 71°F | 0.2" |
| August | 65°F | 85°F | 72°F | 0.0" |
| September | 63°F | 85°F | 72°F | 0.3" |
| October | 59°F | 81°F | 68°F | 0.5" |
| November | 52°F | 76°F | 62°F | 0.7" |
| December | 46°F | 69°F | 56°F | 2.7" |
| Index | Bellflower | 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. |
| West Whittier-Los Nietos, CA | 26,121 | 72 | 44.0% |
| East Whittier, CA | 10,182 | 72 | 44.0% |
| North El Monte, CA | 3,709 | 72 | 44.0% |
| South El Monte, CA | 20,791 | 72 | 44.0% |
| Carson, CA | 91,354 | 72 | 44.0% |
| Bellflower, CA | 76,339 | 72 | 44.0% |
| City | Population | Air Quality Index | National Avg. |
| Hammond, IN | 76,141 | 55 | 10.0% |
| Rapid City, SD | 76,541 | 44 | 12.0% |
| Kalamazoo, MI | 76,106 | 38 | 24.0% |
| Baytown, TX | 76,089 | 52 | 4.0% |
| Temple, TX | 76,590 | 42 | 16.0% |
| Bellflower, CA | 76,339 | 72 | 44.0% |
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