| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 44°F | 66°F | 54°F | 13.7" |
| February | 47°F | 67°F | 56°F | 10.8" |
| March | 48°F | 69°F | 57°F | 3.2" |
| April | 48°F | 69°F | 58°F | 7.3" |
| May | 53°F | 71°F | 62°F | 2.1" |
| June | 57°F | 72°F | 65°F | 0.0" |
| July | 60°F | 76°F | 67°F | 0.0" |
| August | 59°F | 78°F | 67°F | 0.0" |
| September | 55°F | 77°F | 65°F | 1.2" |
| October | 53°F | 76°F | 63°F | 2.3" |
| November | 49°F | 73°F | 59°F | 1.5" |
| December | 43°F | 67°F | 54°F | 2.6" |
| Index | El Rio | California | National |
| Air quality index | 48 | 55 | 50 |
| Pollution index | 13,529,800 | 18,106,726 | 5,066,862 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 208 |
| Days with moderate air quality | 152 |
| Days w/ poor A.Q. for sensitive groups | 5 |
| Days with unhealthy air quality |
| Pollutant | Total |
| Arsenic | 0.150% |
| Benzene | 0.190% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.180% |
| Mercury | 0.070% |
| City, State | Population | Air Quality Index | National Avg. |
| Camarillo, CA | 66,630 | 48 | 4% |
| Meiners Oaks, CA | 3,348 | 48 | 4% |
| Oxnard, CA | 204,752 | 48 | 4% |
| Santa Rosa Valley, CA | 3,601 | 48 | 4% |
| Casa Conejo, CA | 3,180 | 48 | 4% |
| El Rio, CA | 7,412 | 48 | 4% |
| City, State | Population | Air Quality Index | National Avg. |
| Hatboro, PA | 7,412 | 57 | 14% |
| Kennedale, TX | 7,413 | 54 | 8% |
| South Cleveland, TN | 7,414 | 1 | 98% |
| Crystal City, TX | 7,414 | 285 | 470% |
| Wellington, CO | 7,409 | 46 | 8% |
| El Rio, CA | 7,412 | 48 | 4% |