| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | -10°F | 9°F | -1°F | 1.0" |
| February | -6°F | 18°F | 5°F | 0.7" |
| March | -2°F | 29°F | 14°F | 0.4" |
| April | 20°F | 46°F | 34°F | 0.3" |
| May | 32°F | 61°F | 47°F | 0.6" |
| June | 41°F | 69°F | 55°F | 1.1" |
| July | 46°F | 71°F | 58°F | 1.9" |
| August | 42°F | 66°F | 54°F | 2.0" |
| September | 33°F | 57°F | 45°F | 1.4" |
| October | 18°F | 39°F | 28°F | 1.0" |
| November | -6°F | 16°F | 5°F | 1.0" |
| December | -10°F | 9°F | 0°F | 1.0" |
| Index | Slana | Alaska | National |
| Air quality index | 38 | 30 | 42 |
| Pollution index | 749,334 | 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 | 0.002% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.010% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Mentasta Lake, AK | 266 | 38 | 24.0% |
| Slana, AK | 27 | 38 | 24.0% |
| City | Population | Air Quality Index | National Avg. |
| Belgreen, AL | 27 | 37 | 26.0% |
| Flowing Springs, AZ | 27 | 60 | 20.0% |
| Prattville, CA | 27 | 46 | 8.0% |
| Bevington, IA | 27 | 39 | 22.0% |
| Jolley, IA | 27 | 37 | 26.0% |
| Slana, AK | 27 | 38 | 24.0% |
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