| 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 | Navajo | New Mexico | National |
| Air quality index | 17 | 37 | 42 |
| Pollution index | 5,861,710 | 2,051,791 | 2,726,193 |
| 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 | 0.310% |
| Benzene | 0.030% |
| Carbon Tetrachloride | 0.004% |
| Lead | 0.090% |
| Mercury | 0.250% |
| City | Population | Air Quality Index | National Avg. |
| Crystal, NM | 331 | 17 | 66.0% |
| Nakaibito, NM | 214 | 17 | 66.0% |
| Sawmill, AZ | 706 | 17 | 66.0% |
| Fort Defiance, AZ | 4,209 | 17 | 66.0% |
| Navajo, NM | 1,818 | 17 | 66.0% |
| City | Population | Air Quality Index | National Avg. |
| Tecumseh, NE | 1,818 | 31 | 38.0% |
| Second Mesa, AZ | 1,817 | 45 | 10.0% |
| Homosassa, FL | 1,817 | 30 | 40.0% |
| Carrier Mills, IL | 1,819 | 44 | 12.0% |
| New Union, TN | 1,819 | 25 | 50.0% |
| Navajo, NM | 1,818 | 17 | 66.0% |
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