| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 39°F | 67°F | 53°F | 12.4" |
| February | 44°F | 69°F | 55°F | 8.4" |
| March | 46°F | 75°F | 59°F | 2.2" |
| April | 46°F | 77°F | 60°F | 4.9" |
| May | 52°F | 82°F | 65°F | 0.8" |
| June | 54°F | 86°F | 68°F | 0.0" |
| July | 61°F | 94°F | 76°F | 0.4" |
| August | 61°F | 95°F | 76°F | 0.0" |
| September | 55°F | 89°F | 70°F | 1.6" |
| October | 51°F | 83°F | 65°F | 2.8" |
| November | 43°F | 77°F | 59°F | 1.1" |
| December | 38°F | 68°F | 52°F | 1.3" |
| Index | Eastvale | 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% |
| Chino Hills, CA | 82,800 | 89 | 78.0% |
| Diamond Bar, CA | 55,870 | 89 | 78.0% |
| Ontario, CA | 178,194 | 89 | 78.0% |
| Upland, CA | 77,348 | 89 | 78.0% |
| Eastvale, CA | 65,766 | 89 | 78.0% |
| City | Population | Air Quality Index | National Avg. |
| Lakeville, MN | 65,710 | 46 | 8.0% |
| Shawnee, KS | 65,844 | 47 | 6.0% |
| Madera, CA | 65,575 | 50 | = 100 |
| Auburn, AL | 65,508 | 42 | 16.0% |
| Halton Hills, ON | 65,483 | n/a | |
| Eastvale, CA | 65,766 | 89 | 78.0% |
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