| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 40°F | 70°F | 54°F | 1.6" |
| February | 41°F | 71°F | 55°F | 1.4" |
| March | 44°F | 75°F | 58°F | 0.8" |
| April | 47°F | 78°F | 61°F | 0.4" |
| May | 52°F | 82°F | 65°F | 0.3" |
| June | 57°F | 89°F | 71°F | 0.0" |
| July | 62°F | 94°F | 76°F | 0.1" |
| August | 61°F | 96°F | 77°F | 0.0" |
| September | 59°F | 94°F | 74°F | 0.1" |
| October | 52°F | 86°F | 67°F | 0.3" |
| November | 44°F | 78°F | 60°F | 0.4" |
| December | 39°F | 69°F | 53°F | 2.0" |
| Index | Pomona | California | National |
| Air quality index | 89 | 55 | 42 |
| Pollution index | 22,790,900 | 10,473,190 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 42 |
| Days with moderate air quality | 178 |
| Days w/ poor A.Q. for sensitive groups | 79 |
| Days with unhealthy air quality | 58 |
| Pollutant | Total |
| Arsenic | 0.060% |
| Benzene | 0.190% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.220% |
| Mercury | 0.230% |
| City | Population | Air Quality Index | National Avg. |
| Duarte, CA | 21,399 | 72 | 44.0% |
| Industry, CA | 264 | 72 | 44.0% |
| South San Jose Hills, CA | 19,104 | 72 | 44.0% |
| West Covina, CA | 105,808 | 72 | 44.0% |
| Fullerton, CA | 141,061 | 72 | 44.0% |
| Pomona, CA | 151,124 | 89 | 78.0% |
| City | Population | Air Quality Index | National Avg. |
| Escondido, CA | 150,396 | 64 | 28.0% |
| Pasadena, TX | 152,537 | 52 | 4.0% |
| Sunnyvale, CA | 152,569 | 43 | 14.0% |
| Lévis, QC | 149,331 | n/a | |
| Kansas City, KS | 153,014 | 47 | 6.0% |
| Pomona, CA | 151,124 | 89 | 78.0% |
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