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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 19°F | 28°F | 23°F | 4.8" |
| February | 19°F | 30°F | 24°F | 4.6" |
| March | 23°F | 34°F | 27°F | 6.5" |
| April | 27°F | 41°F | 32°F | 3.4" |
| May | 35°F | 52°F | 42°F | 2.7" |
| June | 42°F | 60°F | 49°F | 3.5" |
| July | 53°F | 72°F | 61°F | 1.0" |
| August | 51°F | 71°F | 59°F | 1.0" |
| September | 44°F | 61°F | 50°F | 1.6" |
| October | 32°F | 45°F | 37°F | 4.2" |
| November | 23°F | 33°F | 27°F | 6.4" |
| December | 16°F | 25°F | 21°F | 6.1" |
| Index | Mullan | Idaho | National |
| Air quality index | 10 | 32 | 42 |
| Pollution index | 1,107,360 | 2,063,710 | 2,726,193 |
| Measurement | Total |
| Days measured | 350 |
| Days with good air quality | 350 |
| Days with moderate air quality | 0 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.004% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Osburn, ID | 1,552 | 43 | 14.0% |
| Wallace, ID | 1,076 | 43 | 14.0% |
| Mullan, ID | 784 | 10 | 80.0% |
| City | Population | Air Quality Index | National Avg. |
| Kinston, AL | 784 | 35 | 30.0% |
| Lyons, MI | 784 | 36 | 28.0% |
| Cleveland, MO | 784 | 47 | 6.0% |
| Newell, SD | 784 | 44 | 12.0% |
| Saint-Télesphore, QC | 784 | n/a | |
| Mullan, ID | 784 | 10 | 80.0% |
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