| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 41°F | 69°F | 54°F | 11.3" |
| February | 41°F | 71°F | 55°F | 4.5" |
| March | 41°F | 76°F | 58°F | 2.0" |
| April | 44°F | 78°F | 61°F | 1.7" |
| May | 48°F | 79°F | 64°F | 0.8" |
| June | 54°F | 86°F | 69°F | 0.0" |
| July | 59°F | 90°F | 74°F | 0.1" |
| August | 58°F | 92°F | 74°F | 0.1" |
| September | 53°F | 90°F | 71°F | 2.2" |
| October | 49°F | 83°F | 65°F | 2.4" |
| November | 42°F | 78°F | 59°F | 3.4" |
| December | 39°F | 68°F | 52°F | 11.0" |
| Index | Coronita | California | National |
| Air quality index | 89 | 55 | 42 |
| Pollution index | 22,790,900 | 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 | 0.060% |
| Benzene | 0.190% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.220% |
| Mercury | 0.230% |
| City | Population | Air Quality Index | National Avg. |
| Pomona, CA | 151,124 | 89 | 78.0% |
| Irvine, CA | 272,694 | 89 | 78.0% |
| Yorba Linda, CA | 68,103 | 89 | 78.0% |
| Lake Mathews, CA | 7,389 | 89 | 78.0% |
| Grand Terrace, CA | 12,559 | 89 | 78.0% |
| Coronita, CA | 3,968 | 89 | 78.0% |
| City | Population | Air Quality Index | National Avg. |
| Fulton, MS | 3,968 | 39 | 22.0% |
| Elkin, NC | 3,968 | 45 | 10.0% |
| Asphodel-Norwood, ON | 3,968 | n/a | |
| Richwood, NJ | 3,967 | 40 | 20.0% |
| Midway North, TX | 3,967 | 42 | 16.0% |
| Coronita, CA | 3,968 | 89 | 78.0% |
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