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| 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 | Uc Irvine | Irvine | California |
| Air quality index | 89 | 89 | 55 |
| Pollution index | 44,192,600 | 44,192,600 | 10,473,190 |
| 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. |
| Hawaiian Gardens, CA | 14,212 | 72 | 44.0% |
| Seal Beach, CA | 24,268 | 72 | 44.0% |
| Midway City, CA | 8,681 | 72 | 44.0% |
| La Palma, CA | 15,657 | 72 | 44.0% |
| Stanton, CA | 38,317 | 72 | 44.0% |
| Irvine, CA | 272,694 | 89 | 78.0% |
| City | Population | Air Quality Index | National Avg. |
| Toledo, OH | 275,116 | 40 | 20.0% |
| Durham, NC | 276,341 | 44 | 12.0% |
| Chula Vista, CA | 268,779 | 64 | 28.0% |
| Fort Wayne, IN | 268,378 | 45 | 10.0% |
| Saskatoon, SK | 281,340 | n/a | |
| Irvine, CA | 272,694 | 89 | 78.0% |