| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 32°F | 41°F | 37°F | 9.4" |
| February | 31°F | 43°F | 36°F | 6.1" |
| March | 32°F | 45°F | 37°F | 7.6" |
| April | 35°F | 52°F | 43°F | 6.3" |
| May | 42°F | 59°F | 49°F | 4.3" |
| June | 47°F | 62°F | 53°F | 3.9" |
| July | 51°F | 64°F | 56°F | 5.0" |
| August | 51°F | 65°F | 57°F | 6.9" |
| September | 48°F | 61°F | 54°F | 11.3" |
| October | 41°F | 53°F | 46°F | 11.5" |
| November | 34°F | 44°F | 39°F | 10.5" |
| December | 31°F | 41°F | 36°F | 8.5" |
| Index | Klawock | Alaska | National |
| Air quality index | 20 | 30 | 42 |
| Pollution index | 455,086 | 11,243,194 | 2,726,193 |
| Measurement | Total |
| Days measured | 362 |
| Days with good air quality | 308 |
| Days with moderate air quality | 51 |
| Days w/ poor A.Q. for sensitive groups | 3 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Craig, AK | 1,206 | 20 | 60.0% |
| Klawock, AK | 855 | 20 | 60.0% |
| City | Population | Air Quality Index | National Avg. |
| Piper City, IL | 855 | 42 | 16.0% |
| Freeport, MN | 855 | 32 | 36.0% |
| Trego, MT | 855 | 37 | 26.0% |
| Tohatchi, NM | 855 | 17 | 66.0% |
| Earlville, NY | 855 | 27 | 46.0% |
| Klawock, AK | 855 | 20 | 60.0% |
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