| 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 Habra Heights | 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. |
| Industry, CA | 264 | 72 | 44.0% |
| South San Jose Hills, CA | 19,104 | 72 | 44.0% |
| West Covina, CA | 105,808 | 72 | 44.0% |
| Cerritos, CA | 49,388 | 72 | 44.0% |
| Fullerton, CA | 141,061 | 72 | 44.0% |
| La Habra Heights, CA | 5,318 | 72 | 44.0% |
| City | Population | Air Quality Index | National Avg. |
| Lee Acres, NM | 5,318 | 49 | 2.0% |
| Palmerton, PA | 5,317 | 42 | 16.0% |
| Saint-Germain-de-Grantham, QC | 5,316 | n/a | |
| Hawkinsville, GA | 5,320 | 38 | 24.0% |
| Morris, MN | 5,320 | 25 | 50.0% |
| La Habra Heights, CA | 5,318 | 72 | 44.0% |
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