| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 30°F | 60°F | 44°F | 1.6" |
| February | 34°F | 64°F | 48°F | 1.2" |
| March | 40°F | 70°F | 54°F | 0.6" |
| April | 44°F | 76°F | 59°F | 0.3" |
| May | 53°F | 84°F | 68°F | 0.1" |
| June | 62°F | 94°F | 78°F | 0.0" |
| July | 68°F | 100°F | 84°F | 0.2" |
| August | 65°F | 99°F | 83°F | 0.0" |
| September | 56°F | 93°F | 75°F | 0.2" |
| October | 46°F | 81°F | 63°F | 0.4" |
| November | 36°F | 70°F | 52°F | 0.4" |
| December | 30°F | 59°F | 43°F | 1.0" |
| Index | Leona Valley | California | National |
| Air quality index | 72 | 55 | 42 |
| Pollution index | 139,490,000 | 10,473,190 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 66 |
| Days with moderate air quality | 208 |
| Days w/ poor A.Q. for sensitive groups | 62 |
| Days with unhealthy air quality | 28 |
| Pollutant | Total |
| Arsenic | 0.200% |
| Benzene | 0.950% |
| Carbon Tetrachloride | 0.080% |
| Lead | 1.320% |
| Mercury | 0.440% |
| City | Population | Air Quality Index | National Avg. |
| Quartz Hill, CA | 10,405 | 72 | 44.0% |
| Lake Hughes, CA | 660 | 72 | 44.0% |
| Desert View Highlands, CA | 3,259 | 72 | 44.0% |
| Acton, CA | 7,054 | 72 | 44.0% |
| Santa Clarita, CA | 212,519 | 72 | 44.0% |
| Leona Valley, CA | 1,672 | 72 | 44.0% |
| City | Population | Air Quality Index | National Avg. |
| Hillcrest, IL | 1,672 | 42 | 16.0% |
| Waterville, NY | 1,672 | 27 | 46.0% |
| Ashley, OH | 1,672 | 41 | 18.0% |
| Franklin, QC | 1,672 | n/a | |
| Cheswold, DE | 1,673 | 42 | 16.0% |
| Leona Valley, CA | 1,672 | 72 | 44.0% |
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