| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 36°F | 60°F | 48°F | 2.1" |
| February | 38°F | 66°F | 52°F | 2.9" |
| March | 42°F | 72°F | 56°F | 2.3" |
| April | 46°F | 77°F | 61°F | 3.2" |
| May | 52°F | 83°F | 67°F | 1.0" |
| June | 63°F | 96°F | 80°F | 4.8" |
| July | 66°F | 98°F | 83°F | 1.0" |
| August | 65°F | 98°F | 82°F | 0.9" |
| September | 59°F | 91°F | 75°F | 1.7" |
| October | 50°F | 80°F | 65°F | 3.5" |
| November | 41°F | 69°F | 54°F | 1.0" |
| December | 35°F | 59°F | 46°F | 4.3" |
| Index | Apple Valley | California | National |
| Air quality index | 89 | 55 | 42 |
| Pollution index | 31,575,300 | 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 | 0.110% |
| Benzene | 0.260% |
| Carbon Tetrachloride | 0.020% |
| Lead | 0.350% |
| Mercury | 0.280% |
| City | Population | Air Quality Index | National Avg. |
| Mountain View Acres, CA | 3,698 | 89 | 78.0% |
| Lucerne Valley, CA | 5,694 | 89 | 78.0% |
| Spring Valley Lake, CA | 8,408 | 89 | 78.0% |
| Oak Hills, CA | 10,415 | 89 | 78.0% |
| Victorville, CA | 122,958 | 89 | 78.0% |
| Apple Valley, CA | 73,339 | 89 | 78.0% |
| City | Population | Air Quality Index | National Avg. |
| Flagstaff, AZ | 73,319 | 45 | 10.0% |
| Schaumburg, IL | 73,392 | 55 | 10.0% |
| Ellicott City, MD | 73,272 | 46 | 8.0% |
| Bismarck, ND | 73,435 | 36 | 28.0% |
| Cheektowaga, NY | 73,457 | 39 | 22.0% |
| Apple Valley, CA | 73,339 | 89 | 78.0% |
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