| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 26°F | 35°F | 30°F | 13.2" |
| February | 28°F | 37°F | 32°F | 5.0" |
| March | 31°F | 41°F | 35°F | 7.4" |
| April | 35°F | 49°F | 41°F | 10.0" |
| May | 42°F | 58°F | 49°F | 3.1" |
| June | 47°F | 61°F | 54°F | 4.1" |
| July | 51°F | 62°F | 55°F | 9.0" |
| August | 49°F | 64°F | 56°F | 17.4" |
| September | 46°F | 55°F | 50°F | 7.5" |
| October | 38°F | 48°F | 43°F | 5.1" |
| November | 33°F | 42°F | 37°F | 23.1" |
| December | 28°F | 37°F | 32°F | 10.8" |
| Index | Petersburg | Alaska | National |
| Air quality index | 20 | 30 | 42 |
| Pollution index | 285,879 | 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. |
| Kupreanof, AK | 6 | 20 | 60.0% |
| Petersburg, AK | 3,170 | 20 | 60.0% |
| City | Population | Air Quality Index | National Avg. |
| Bushnell, FL | 3,170 | 30 | 40.0% |
| Cadiz, OH | 3,169 | 39 | 22.0% |
| Pickens, SC | 3,169 | 46 | 8.0% |
| Blue Ridge, VA | 3,169 | 38 | 24.0% |
| Pictou, NS | 3,169 | n/a | |
| Petersburg, AK | 3,170 | 20 | 60.0% |
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