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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 44°F | 69°F | 56°F | 2.3" |
| February | 45°F | 70°F | 57°F | 2.0" |
| March | 48°F | 74°F | 60°F | 1.2" |
| April | 51°F | 77°F | 62°F | 0.7" |
| May | 55°F | 81°F | 66°F | 0.4" |
| June | 60°F | 88°F | 72°F | 0.0" |
| July | 65°F | 94°F | 77°F | 0.1" |
| August | 65°F | 95°F | 78°F | 0.0" |
| September | 64°F | 93°F | 76°F | 0.2" |
| October | 57°F | 84°F | 69°F | 0.4" |
| November | 49°F | 77°F | 62°F | 0.6" |
| December | 43°F | 68°F | 55°F | 2.6" |
| Index | San Dimas | California | National |
| Air quality index | 89 | 55 | 42 |
| Pollution index | 139,490,000 | 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 | 0.200% |
| Benzene | 0.950% |
| Carbon Tetrachloride | 0.080% |
| Lead | 1.320% |
| Mercury | 0.440% |
| City | Population | Air Quality Index | National Avg. |
| Baldwin Park, CA | 75,659 | 72 | 44.0% |
| La Puente, CA | 39,780 | 72 | 44.0% |
| Vincent, CA | 16,405 | 72 | 44.0% |
| La Habra, CA | 62,787 | 72 | 44.0% |
| South Whittier, CA | 58,616 | 72 | 44.0% |
| San Dimas, CA | 33,812 | 89 | 78.0% |
| City | Population | Air Quality Index | National Avg. |
| Ken Caryl, CO | 33,815 | 58 | 16.0% |
| Newark, DE | 33,822 | 42 | 16.0% |
| LaSalle, ON | 33,838 | n/a | |
| Kearney, NE | 33,783 | 19 | 62.0% |
| Dana Point, CA | 33,782 | 89 | 78.0% |
| San Dimas, CA | 33,812 | 89 | 78.0% |
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