| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 48°F | 69°F | 57°F | 2.3" |
| February | 49°F | 69°F | 58°F | 1.9" |
| March | 52°F | 70°F | 60°F | 0.9" |
| April | 54°F | 72°F | 62°F | 0.6" |
| May | 59°F | 73°F | 65°F | 0.3" |
| June | 62°F | 76°F | 67°F | 0.0" |
| July | 66°F | 80°F | 71°F | 0.1" |
| August | 66°F | 82°F | 72°F | 0.0" |
| September | 65°F | 82°F | 72°F | 0.2" |
| October | 60°F | 79°F | 68°F | 0.5" |
| November | 54°F | 75°F | 63°F | 0.7" |
| December | 48°F | 68°F | 57°F | 2.4" |
| Index | Aliso Viejo | California | National |
| Air quality index | 89 | 55 | 50 |
| Pollution index | 44,192,600 | 18,106,726 | 5,066,862 |
| 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 | 0.030% |
| Benzene | 0.280% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.220% |
| Mercury | 0.140% |
| City, State | Population | Air Quality Index | National Avg. |
| Midway City, CA | 9,235 | 72 | 44% |
| Fountain Valley, CA | 56,670 | 72 | 44% |
| Garden Grove, CA | 174,676 | 72 | 44% |
| Dana Point, CA | 34,009 | 89 | 78% |
| San Clemente, CA | 65,082 | 89 | 78% |
| Aliso Viejo, CA | 50,219 | 89 | 78% |
| City, State | Population | Air Quality Index | National Avg. |
| Charleston, WV | 50,210 | 40 | 20% |
| Burien, WA | 50,187 | 45 | 10% |
| Rowland Heights, CA | 50,281 | 89 | 78% |
| Caldwell, ID | 50,288 | 36 | 28% |
| Edina, MN | 49,976 | 46 | 8% |
| Aliso Viejo, CA | 50,219 | 89 | 78% |
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