| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 16°F | 45°F | 29°F | 2.4" |
| February | 18°F | 48°F | 33°F | 2.0" |
| March | 23°F | 55°F | 39°F | 1.5" |
| April | 26°F | 62°F | 45°F | 0.9" |
| May | 33°F | 69°F | 53°F | 0.8" |
| June | 42°F | 81°F | 64°F | 0.4" |
| July | 51°F | 83°F | 67°F | 3.5" |
| August | 50°F | 80°F | 64°F | 3.7" |
| September | 42°F | 75°F | 58°F | 1.8" |
| October | 31°F | 66°F | 48°F | 1.3" |
| November | 23°F | 56°F | 38°F | 1.2" |
| December | 15°F | 46°F | 30°F | 2.6" |
| Index | Flagstaff | Arizona | National |
| Air quality index | 45 | 57 | 42 |
| Pollution index | 15,258,300 | 9,766,019 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 293 |
| Days with moderate air quality | 72 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.430% |
| Benzene | 0.060% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.130% |
| Mercury | 0.150% |
| City | Population | Air Quality Index | National Avg. |
| Kachina Village, AZ | 3,154 | 45 | 10.0% |
| Mountainaire, AZ | 792 | 45 | 10.0% |
| Doney Park, AZ | 4,891 | 45 | 10.0% |
| Fort Valley, AZ | 2,108 | 45 | 10.0% |
| Flagstaff, AZ | 73,319 | 45 | 10.0% |
| City | Population | Air Quality Index | National Avg. |
| Apple Valley, CA | 73,339 | 89 | 78.0% |
| Ellicott City, MD | 73,272 | 46 | 8.0% |
| Schaumburg, IL | 73,392 | 55 | 10.0% |
| Bismarck, ND | 73,435 | 36 | 28.0% |
| Cheektowaga, NY | 73,457 | 39 | 22.0% |
| Flagstaff, AZ | 73,319 | 45 | 10.0% |
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