| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 48°F | 67°F | 56°F | 8.9" |
| February | 51°F | 68°F | 58°F | 7.7" |
| March | 54°F | 70°F | 61°F | 2.5" |
| April | 55°F | 70°F | 61°F | 3.7" |
| May | 59°F | 73°F | 65°F | 1.5" |
| June | 61°F | 73°F | 66°F | 0.0" |
| July | 66°F | 79°F | 71°F | 0.0" |
| August | 67°F | 80°F | 72°F | 0.0" |
| September | 63°F | 78°F | 69°F | 4.9" |
| October | 59°F | 77°F | 67°F | 4.0" |
| November | 56°F | 74°F | 63°F | 2.7" |
| December | 50°F | 68°F | 58°F | 3.4" |
| Index | Lynwood | 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. |
| Avocado Heights, CA | 13,836 | 72 | 44.0% |
| El Monte, CA | 113,917 | 72 | 44.0% |
| Rosemead, CA | 53,850 | 72 | 44.0% |
| South Monrovia Island, CA | 6,565 | 72 | 44.0% |
| Carson, CA | 91,354 | 72 | 44.0% |
| Lynwood, CA | 69,625 | 72 | 44.0% |
| City | Population | Air Quality Index | National Avg. |
| Marysville, WA | 69,629 | 24 | 52.0% |
| Greenville, SC | 69,648 | 46 | 8.0% |
| Glen Burnie, MD | 69,649 | 46 | 8.0% |
| Granby, QC | 69,530 | n/a | |
| Grande Prairie, AB | 69,512 | n/a | |
| Lynwood, CA | 69,625 | 72 | 44.0% |
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