| 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 | Orange | California | National |
| Air quality index | 89 | 55 | 42 |
| Pollution index | 858,652 | 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 | 0.002% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.020% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Hacienda Heights, CA | 55,386 | 72 | 44.0% |
| Hawaiian Gardens, CA | 14,212 | 72 | 44.0% |
| La Mirada, CA | 48,260 | 72 | 44.0% |
| Pico Rivera, CA | 62,507 | 72 | 44.0% |
| South Whittier, CA | 58,616 | 72 | 44.0% |
| Orange, CA | 139,322 | 89 | 78.0% |
| City | Population | Air Quality Index | National Avg. |
| Olathe, KS | 139,216 | 47 | 6.0% |
| Surprise, AZ | 139,007 | 74 | 48.0% |
| Denton, TX | 139,734 | 51 | 2.0% |
| Roseville, CA | 138,860 | 52 | 4.0% |
| Trois-Rivières, QC | 138,766 | n/a | |
| Orange, CA | 139,322 | 89 | 78.0% |
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