| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | -9°F | 5°F | -2°F | n/a |
| February | -3°F | 16°F | 8°F | n/a |
| March | 4°F | 23°F | 15°F | n/a |
| April | 23°F | 42°F | 35°F | 0.8" |
| May | 39°F | 57°F | 49°F | 2.9" |
| June | 47°F | 64°F | 56°F | 5.0" |
| July | 50°F | 67°F | 59°F | 5.1" |
| August | 44°F | 61°F | 53°F | 6.2" |
| September | 35°F | 54°F | 46°F | 8.7" |
| October | 21°F | 36°F | 29°F | n/a |
| November | 6°F | 18°F | 12°F | n/a |
| December | -8°F | 5°F | -1°F | n/a |
| Index | Mentasta Lake | Alaska | National |
| Air quality index | 38 | 30 | 42 |
| Pollution index | 9,104,530 | 11,243,194 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 230 |
| Days with moderate air quality | 96 |
| Days w/ poor A.Q. for sensitive groups | 18 |
| Days with unhealthy air quality | 16 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.210% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.010% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Slana, AK | 28 | 38 | 24.0% |
| Mentasta Lake, AK | 271 | 38 | 24.0% |
| City | Population | Air Quality Index | National Avg. |
| Moro, AR | 271 | 45 | 10.0% |
| Oden, AR | 271 | 38 | 24.0% |
| Damascus, GA | 271 | 40 | 20.0% |
| Hancock, IA | 271 | 40 | 20.0% |
| Garden Prairie, IL | 271 | 42 | 16.0% |
| Mentasta Lake, AK | 271 | 38 | 24.0% |