| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 37°F | 67°F | 51°F | 2.5" |
| February | 38°F | 68°F | 52°F | 1.6" |
| March | 40°F | 73°F | 56°F | 1.1" |
| April | 44°F | 77°F | 59°F | 0.8" |
| May | 50°F | 81°F | 64°F | 0.3" |
| June | 55°F | 90°F | 72°F | 0.0" |
| July | 62°F | 95°F | 77°F | 0.3" |
| August | 61°F | 95°F | 77°F | 0.7" |
| September | 58°F | 93°F | 74°F | 0.2" |
| October | 50°F | 83°F | 65°F | 0.3" |
| November | 41°F | 75°F | 57°F | 0.7" |
| December | 36°F | 66°F | 50°F | 2.9" |
| Index | Perris | 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. |
| Lake Mathews, CA | 7,389 | 89 | 78.0% |
| Nuevo, CA | 6,999 | 89 | 78.0% |
| Cherry Valley, CA | 8,026 | 89 | 78.0% |
| Canyon Lake, CA | 11,237 | 89 | 78.0% |
| Homeland, CA | 7,613 | 89 | 78.0% |
| Perris, CA | 77,708 | 89 | 78.0% |
| City | Population | Air Quality Index | National Avg. |
| Waldorf, MD | 77,711 | 47 | 6.0% |
| Bloomington, IL | 77,725 | 44 | 12.0% |
| Lake Charles, LA | 77,832 | 45 | 10.0% |
| Jonesboro, AR | 77,391 | 45 | 10.0% |
| Boynton Beach, FL | 78,060 | 41 | 18.0% |
| Perris, CA | 77,708 | 89 | 78.0% |
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