| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 27°F | 37°F | 33°F | 6.1" |
| February | 29°F | 38°F | 34°F | 7.6" |
| March | 30°F | 39°F | 34°F | 6.3" |
| April | 32°F | 42°F | 37°F | 4.3" |
| May | 37°F | 45°F | 41°F | 4.6" |
| June | 42°F | 50°F | 45°F | 2.2" |
| July | 45°F | 55°F | 49°F | 3.6" |
| August | 47°F | 57°F | 51°F | 3.1" |
| September | 44°F | 54°F | 49°F | 5.7" |
| October | 38°F | 48°F | 43°F | 6.3" |
| November | 33°F | 43°F | 38°F | 4.5" |
| December | 29°F | 39°F | 35°F | 4.5" |
| Index | Adak | Alaska | National |
| Air quality index | 31 | 30 | 42 |
| Pollution index | 204,690 | 11,243,194 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 262 |
| Days with moderate air quality | 92 |
| Days w/ poor A.Q. for sensitive groups | 7 |
| Days with unhealthy air quality | 4 |
| Pollutant | Total |
| Arsenic | 0.030% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.010% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Adak, AK | 188 | 31 | 38.0% |
| City | Population | Air Quality Index | National Avg. |
| Halibut Cove, AK | 188 | 31 | 38.0% |
| Nikolaevsk, AK | 188 | 31 | 38.0% |
| Bluff City, AR | 188 | 32 | 36.0% |
| Pinion Pines, AZ | 188 | 13 | 74.0% |
| Weldona, CO | 188 | 45 | 10.0% |
| Adak, AK | 188 | 31 | 38.0% |
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