| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | -16°F | 0°F | -9°F | 0.3" |
| February | -8°F | 13°F | 1°F | 0.1" |
| March | -6°F | 19°F | 6°F | 0.4" |
| April | 16°F | 39°F | 28°F | 0.6" |
| May | 35°F | 58°F | 47°F | 0.5" |
| June | 48°F | 68°F | 58°F | 2.0" |
| July | 52°F | 69°F | 61°F | 2.3" |
| August | 47°F | 64°F | 55°F | 2.4" |
| September | 36°F | 53°F | 44°F | 2.3" |
| October | 22°F | 35°F | 28°F | 0.7" |
| November | -1°F | 14°F | 6°F | 0.1" |
| December | -8°F | 7°F | -1°F | 0.1" |
| Index | Koyukuk | Alaska | National |
| Air quality index | 38 | 30 | 42 |
| Pollution index | 269,884,000 | 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 | 6.330% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Nulato, AK | 300 | 38 | 24.0% |
| Koyukuk, AK | 52 | 38 | 24.0% |
| City | Population | Air Quality Index | National Avg. |
| Chignik Lake, AK | 52 | 31 | 38.0% |
| Chistochina, AK | 52 | 31 | 38.0% |
| Everton, AR | 52 | 36 | 28.0% |
| Ponderosa, CA | 52 | 66 | 32.0% |
| Carbon, IA | 52 | 40 | 20.0% |
| Koyukuk, AK | 52 | 38 | 24.0% |
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