| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 48°F | 66°F | 56°F | 5.1" |
| February | 48°F | 64°F | 56°F | 4.2" |
| March | 51°F | 66°F | 58°F | 2.4" |
| April | 53°F | 68°F | 60°F | 1.6" |
| May | 54°F | 67°F | 58°F | 2.3" |
| June | 58°F | 69°F | 60°F | 0.1" |
| July | 63°F | 72°F | 67°F | 0.5" |
| August | 63°F | 75°F | 68°F | 1.0" |
| September | 62°F | 75°F | 68°F | 0.1" |
| October | 58°F | 71°F | 64°F | 2.0" |
| November | 52°F | 68°F | 59°F | 2.6" |
| December | 49°F | 64°F | 55°F | 7.2" |
| Index | San Clemente | California | National |
| Air quality index | 89 | 55 | 42 |
| Pollution index | 44,192,600 | 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 | 0.030% |
| Benzene | 0.280% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.220% |
| Mercury | 0.140% |
| City | Population | Air Quality Index | National Avg. |
| Aliso Viejo, CA | 50,385 | 89 | 78.0% |
| Laguna Niguel, CA | 65,048 | 89 | 78.0% |
| Rancho Santa Margarita, CA | 48,280 | 89 | 78.0% |
| Las Flores, CA | 5,089 | 89 | 78.0% |
| Dana Point, CA | 33,782 | 89 | 78.0% |
| San Clemente, CA | 64,929 | 89 | 78.0% |
| City | Population | Air Quality Index | National Avg. |
| Wellington, FL | 64,990 | 36 | 28.0% |
| Santa Cruz, CA | 65,011 | 35 | 30.0% |
| Harlingen, TX | 65,028 | 44 | 12.0% |
| Laguna Niguel, CA | 65,048 | 89 | 78.0% |
| Blaine, MN | 65,048 | 46 | 8.0% |
| San Clemente, CA | 64,929 | 89 | 78.0% |
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