| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 48°F | 68°F | 58°F | 2.7" |
| February | 49°F | 68°F | 58°F | 2.1" |
| March | 52°F | 68°F | 59°F | 1.2" |
| April | 54°F | 70°F | 61°F | 0.6" |
| May | 57°F | 70°F | 63°F | 0.3" |
| June | 61°F | 72°F | 65°F | 0.0" |
| July | 64°F | 76°F | 69°F | 0.1" |
| August | 64°F | 76°F | 69°F | 0.0" |
| September | 63°F | 77°F | 69°F | 0.2" |
| October | 60°F | 77°F | 67°F | 0.6" |
| November | 54°F | 73°F | 62°F | 0.7" |
| December | 48°F | 68°F | 57°F | 2.4" |
| Index | Lennox | California | National |
| Air quality index | 72 | 55 | 42 |
| Pollution index | 4,251,410 | 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 | 0.010% |
| Benzene | 0.100% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.010% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Los Angeles, CA | 3,973,278 | 72 | 44.0% |
| Willowbrook, CA | 24,401 | 72 | 44.0% |
| Downey, CA | 111,263 | 72 | 44.0% |
| East Los Angeles, CA | 120,504 | 72 | 44.0% |
| San Pasqual, CA | 2,038 | 72 | 44.0% |
| Lennox, CA | 22,476 | 72 | 44.0% |
| City | Population | Air Quality Index | National Avg. |
| Highland, IN | 22,479 | 55 | 10.0% |
| Mandan, ND | 22,482 | 36 | 28.0% |
| Christiansburg, VA | 22,482 | 41 | 18.0% |
| White Rock, BC | 22,468 | n/a | |
| Dolton, IL | 22,487 | 55 | 10.0% |
| Lennox, CA | 22,476 | 72 | 44.0% |
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