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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 49°F | 70°F | 58°F | 2.2" |
| February | 51°F | 69°F | 58°F | 1.7" |
| March | 53°F | 70°F | 60°F | 1.1" |
| April | 56°F | 72°F | 62°F | 0.6" |
| May | 59°F | 72°F | 64°F | 0.2" |
| June | 62°F | 74°F | 67°F | 0.0" |
| July | 65°F | 78°F | 70°F | 0.0" |
| August | 66°F | 79°F | 71°F | 0.0" |
| September | 65°F | 80°F | 71°F | 0.2" |
| October | 61°F | 79°F | 68°F | 0.4" |
| November | 55°F | 75°F | 63°F | 0.5" |
| December | 49°F | 68°F | 57°F | 2.4" |
| Index | Westmont | 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% |
| Bellflower, CA | 76,339 | 72 | 44.0% |
| Downey, CA | 111,263 | 72 | 44.0% |
| Montebello, CA | 62,697 | 72 | 44.0% |
| Rossmoor, CA | 11,923 | 72 | 44.0% |
| Westmont, CA | 35,188 | 72 | 44.0% |
| City | Population | Air Quality Index | National Avg. |
| Menlo Park, CA | 35,211 | 43 | 14.0% |
| Gadsden, AL | 35,224 | 43 | 14.0% |
| Buenaventura Lakes, FL | 35,117 | 39 | 22.0% |
| Bell, CA | 35,301 | 72 | 44.0% |
| Manhattan Beach, CA | 35,064 | 72 | 44.0% |
| Westmont, CA | 35,188 | 72 | 44.0% |
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