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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 40°F | 73°F | 56°F | 4.3" |
| February | 38°F | 72°F | 54°F | 2.6" |
| March | 42°F | 76°F | 58°F | 2.9" |
| April | 44°F | 79°F | 61°F | 2.8" |
| May | 48°F | 81°F | 65°F | 1.6" |
| June | 53°F | 85°F | 69°F | 5.5" |
| July | 58°F | 89°F | 73°F | 2.7" |
| August | 59°F | 92°F | 75°F | 1.5" |
| September | 56°F | 93°F | 74°F | 4.5" |
| October | 48°F | 85°F | 66°F | 8.5" |
| November | 41°F | 76°F | 58°F | 0.9" |
| December | 36°F | 71°F | 53°F | 1.5" |
| Index | Corona | 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. |
| Colton, CA | 54,215 | 89 | 78.0% |
| Riverside, CA | 327,569 | 89 | 78.0% |
| Diamond Bar, CA | 55,870 | 89 | 78.0% |
| Norco, CA | 27,021 | 89 | 78.0% |
| Lakeland Village, CA | 12,362 | 89 | 78.0% |
| Corona, CA | 168,112 | 89 | 78.0% |
| City | Population | Air Quality Index | National Avg. |
| Springfield, MO | 167,601 | 39 | 22.0% |
| Cary, NC | 169,177 | 46 | 8.0% |
| Fort Collins, CO | 166,069 | 48 | 4.0% |
| Eugene, OR | 170,457 | 38 | 24.0% |
| Greater Sudbury, ON | 165,562 | n/a | |
| Corona, CA | 168,112 | 89 | 78.0% |
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