| 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 | La Mirada | California | National |
| Air quality index | 72 | 55 | 42 |
| Pollution index | 858,652 | 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 | 0.002% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.020% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Los Angeles, CA | 3,973,278 | 72 | 44.0% |
| Bell Gardens, CA | 41,770 | 72 | 44.0% |
| Downey, CA | 111,263 | 72 | 44.0% |
| La Habra Heights, CA | 5,318 | 72 | 44.0% |
| Montebello, CA | 62,697 | 72 | 44.0% |
| La Mirada, CA | 48,260 | 72 | 44.0% |
| City | Population | Air Quality Index | National Avg. |
| Beaumont, CA | 48,272 | 89 | 78.0% |
| Rancho Santa Margarita, CA | 48,280 | 89 | 78.0% |
| Bozeman, MT | 48,330 | 25 | 50.0% |
| Cedar Hill, TX | 48,337 | 51 | 2.0% |
| Victoriaville, QC | 48,167 | n/a | |
| La Mirada, CA | 48,260 | 72 | 44.0% |
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