| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 12°F | 45°F | 27°F | 1.1" |
| February | 18°F | 50°F | 33°F | 0.6" |
| March | 23°F | 59°F | 41°F | 0.4" |
| April | 29°F | 66°F | 48°F | 0.4" |
| May | 36°F | 73°F | 56°F | 0.6" |
| June | 45°F | 86°F | 68°F | 0.4" |
| July | 54°F | 88°F | 71°F | 2.3" |
| August | 52°F | 84°F | 68°F | 1.9" |
| September | 43°F | 79°F | 61°F | 1.3" |
| October | 31°F | 69°F | 49°F | 0.7" |
| November | 21°F | 58°F | 38°F | 0.6" |
| December | 15°F | 46°F | 29°F | 1.1" |
| Index | Chinle | Arizona | National |
| Air quality index | 17 | 57 | 50 |
| Pollution index | 37,658,000 | 5,576,494 | 5,066,862 |
| Measurement | Total |
| Days measured | 128 |
| Days with good air quality | 127 |
| Days with moderate air quality | 1 |
| Days w/ poor A.Q. for sensitive groups | |
| Days with unhealthy air quality |
| Pollutant | Total |
| Arsenic | 0.210% |
| Benzene | 0.750% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.080% |
| Mercury | 0.180% |
| City, State | Population | Air Quality Index | National Avg. |
| Del Muerto, AZ | 430 | 17 | 66% |
| Many Farms, AZ | 1,522 | 17 | 66% |
| Chinle, AZ | 5,420 | 17 | 66% |
| City, State | Population | Air Quality Index | National Avg. |
| North Hills, NY | 5,420 | 51 | 2% |
| Center, TX | 5,421 | 39 | 22% |
| Pinckneyville, IL | 5,422 | 43 | 14% |
| New Holland, PA | 5,418 | 45 | 10% |
| Homer, AK | 5,418 | 31 | 38% |
| Chinle, AZ | 5,420 | 17 | 66% |
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