| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 29°F | 37°F | 33°F | 6.7" |
| February | 31°F | 38°F | 34°F | 10.1" |
| March | 30°F | 38°F | 34°F | 7.2" |
| April | 33°F | 41°F | 36°F | 5.0" |
| May | 37°F | 45°F | 40°F | 23.6" |
| June | 43°F | 52°F | 46°F | 19.7" |
| July | 47°F | 56°F | 50°F | 10.9" |
| August | 49°F | 58°F | 53°F | 2.6" |
| September | 46°F | 55°F | 50°F | 3.1" |
| October | 39°F | 47°F | 43°F | 3.2" |
| November | 33°F | 41°F | 37°F | 1.3" |
| December | 31°F | 38°F | 34°F | 7.5" |
| Index | Unalaska | Alaska | National |
| Air quality index | 31 | 30 | 42 |
| Pollution index | 129,942 | 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 | 0.000% |
| Benzene | 0.002% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Unalaska, AK | 4,758 | 31 | 38.0% |
| City | Population | Air Quality Index | National Avg. |
| Edwardsville, PA | 4,757 | 38 | 24.0% |
| Témiscouata-sur-le-Lac, QC | 4,757 | n/a | |
| Fishhook, AK | 4,759 | 31 | 38.0% |
| Suncoast Estates, FL | 4,759 | 36 | 28.0% |
| Mathis, TX | 4,759 | 30 | 40.0% |
| Unalaska, AK | 4,758 | 31 | 38.0% |
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