| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 48°F | 70°F | 58°F | 3.5" |
| February | 50°F | 70°F | 59°F | 2.9" |
| March | 52°F | 72°F | 61°F | 1.5" |
| April | 55°F | 74°F | 63°F | 0.7" |
| May | 58°F | 75°F | 65°F | 0.5" |
| June | 61°F | 78°F | 68°F | 0.0" |
| July | 65°F | 83°F | 72°F | 0.0" |
| August | 65°F | 84°F | 73°F | 0.0" |
| September | 64°F | 85°F | 72°F | 0.3" |
| October | 60°F | 81°F | 69°F | 0.7" |
| November | 54°F | 75°F | 63°F | 0.8" |
| December | 48°F | 69°F | 57°F | 2.8" |
| Index | Bell | 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. |
| Hawaiian Gardens, CA | 14,212 | 72 | 44.0% |
| La Mirada, CA | 48,260 | 72 | 44.0% |
| Monterey Park, CA | 60,597 | 72 | 44.0% |
| Santa Fe Springs, CA | 17,643 | 72 | 44.0% |
| Whittier, CA | 84,821 | 72 | 44.0% |
| Bell, CA | 35,301 | 72 | 44.0% |
| City | Population | Air Quality Index | National Avg. |
| Tooele, UT | 35,313 | 51 | 2.0% |
| Lufkin, TX | 35,336 | 36 | 28.0% |
| Monroe, NC | 35,339 | 49 | 2.0% |
| La Porte, TX | 35,340 | 52 | 4.0% |
| Olney, MD | 35,350 | 47 | 6.0% |
| Bell, CA | 35,301 | 72 | 44.0% |
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