| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 0°F | 11°F | 6°F | 9.3" |
| February | 4°F | 17°F | 10°F | 0.4" |
| March | 0°F | 15°F | 7°F | 0.8" |
| April | 15°F | 29°F | 22°F | 0.5" |
| May | 31°F | 45°F | 37°F | 2.1" |
| June | 43°F | 57°F | 49°F | 1.5" |
| July | 48°F | 60°F | 53°F | 5.2" |
| August | 47°F | 58°F | 52°F | 2.8" |
| September | 41°F | 51°F | 45°F | 2.4" |
| October | 29°F | 37°F | 33°F | 2.5" |
| November | 14°F | 24°F | 19°F | 1.0" |
| December | 5°F | 17°F | 12°F | 2.0" |
| Index | Kotlik | Alaska | National |
| Air quality index | 31 | 30 | 42 |
| Pollution index | 349,533 | 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 | 0.010% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Kotlik, AK | 1,252 | 31 | 38.0% |
| City | Population | Air Quality Index | National Avg. |
| Weissport East, PA | 1,252 | 42 | 16.0% |
| Green Valley, SD | 1,252 | 44 | 12.0% |
| Iraan, TX | 1,252 | 28 | 44.0% |
| Shullsburg, WI | 1,252 | 29 | 42.0% |
| Georgetown, CT | 1,251 | 43 | 14.0% |
| Kotlik, AK | 1,252 | 31 | 38.0% |
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