| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 32°F | 41°F | 37°F | 18.0" |
| February | 31°F | 42°F | 36°F | 13.3" |
| March | 32°F | 44°F | 38°F | 13.5" |
| April | 37°F | 50°F | 43°F | 12.0" |
| May | 43°F | 58°F | 50°F | 8.8" |
| June | 49°F | 63°F | 55°F | 7.3" |
| July | 53°F | 65°F | 58°F | 9.2" |
| August | 53°F | 66°F | 59°F | 11.4" |
| September | 49°F | 60°F | 54°F | 16.1" |
| October | 42°F | 52°F | 46°F | 20.2" |
| November | 35°F | 43°F | 39°F | 16.0" |
| December | 31°F | 40°F | 35°F | 14.5" |
| Index | Ketchikan | Alaska | National |
| Air quality index | 20 | 30 | 42 |
| Pollution index | 441,733 | 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 | 0.001% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Saxman, AK | 328 | 20 | 60.0% |
| Ketchikan, AK | 8,230 | 20 | 60.0% |
| City | Population | Air Quality Index | National Avg. |
| Drayton Valley, AB | 8,231 | n/a | |
| Mahtomedi, MN | 8,232 | 46 | 8.0% |
| St. Marys, OH | 8,227 | 39 | 22.0% |
| Brazil, IN | 8,225 | 45 | 10.0% |
| Pewaukee village, WI | 8,225 | 44 | 12.0% |
| Ketchikan, AK | 8,230 | 20 | 60.0% |
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