| 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 | Galena | Alaska | National |
| Air quality index | 38 | 30 | 50 |
| Pollution index | 269,884,000 | 11,990,286 | 5,066,862 |
| 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, State | Population | Air Quality Index | National Avg. |
| Galena, AK | 524 | 38 | 24% |
| City, State | Population | Air Quality Index | National Avg. |
| Kopperston, WV | 524 | 295 | 490% |
| Sprague, WA | 524 | 43 | 14% |
| North Brentwood, MD | 524 | 47 | 6% |
| Fairgrove, MI | 524 | 26 | 48% |
| Dry Prong, LA | 524 | 30 | 40% |
| Galena, AK | 524 | 38 | 24% |
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