| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | -1°F | 9°F | 4°F | 1.1" |
| February | 2°F | 14°F | 7°F | 0.6" |
| March | 0°F | 13°F | 6°F | 0.5" |
| April | 17°F | 32°F | 23°F | 1.1" |
| May | 32°F | 48°F | 39°F | 1.8" |
| June | 45°F | 60°F | 51°F | 1.4" |
| July | 50°F | 63°F | 56°F | 5.8" |
| August | 47°F | 61°F | 53°F | 4.1" |
| September | 39°F | 52°F | 44°F | 2.8" |
| October | 26°F | 36°F | 30°F | 2.2" |
| November | 10°F | 20°F | 15°F | 1.3" |
| December | 5°F | 15°F | 10°F | 1.7" |
| Index | Koyuk | Alaska | National |
| Air quality index | 38 | 30 | 42 |
| Pollution index | 481,700 | 11,243,194 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 230 |
| Days with moderate air quality | 96 |
| Days w/ poor A.Q. for sensitive groups | 18 |
| Days with unhealthy air quality | 16 |
| 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. |
| Koyuk, AK | 243 | 38 | 24.0% |
| City | Population | Air Quality Index | National Avg. |
| Malcolm, AL | 243 | 42 | 16.0% |
| East Globe, AZ | 243 | 60 | 20.0% |
| McNeal, AZ | 243 | 45 | 10.0% |
| Bloomfield, CA | 243 | 34 | 32.0% |
| Cressey, CA | 243 | 48 | 4.0% |
| Koyuk, AK | 243 | 38 | 24.0% |
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