| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 33°F | 42°F | 37°F | 9.2" |
| February | 32°F | 42°F | 37°F | 5.4" |
| March | 32°F | 43°F | 37°F | 5.3" |
| April | 37°F | 49°F | 42°F | 4.6" |
| May | 43°F | 55°F | 48°F | 3.7" |
| June | 48°F | 59°F | 53°F | 3.1" |
| July | 52°F | 61°F | 56°F | 5.3" |
| August | 53°F | 63°F | 57°F | 8.1" |
| September | 49°F | 59°F | 53°F | 12.9" |
| October | 42°F | 52°F | 47°F | 11.9" |
| November | 35°F | 44°F | 39°F | 9.3" |
| December | 32°F | 42°F | 37°F | 7.6" |
| Index | Sitka | Alaska | National |
| Air quality index | 20 | 30 | 42 |
| Pollution index | 271,452 | 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 | 0.005% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Sitka, AK | 8,569 | 20 | 60.0% |
| City | Population | Air Quality Index | National Avg. |
| Hoquiam, WA | 8,570 | 20 | 60.0% |
| Monroe, NY | 8,567 | 36 | 28.0% |
| Otterburn Park, QC | 8,571 | n/a | |
| Lake of the Woods, VA | 8,565 | 40 | 20.0% |
| Berthoud, CO | 8,574 | 48 | 4.0% |
| Sitka, AK | 8,569 | 20 | 60.0% |
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