| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 11°F | 24°F | 17°F | 0.9" |
| February | 9°F | 25°F | 17°F | 0.9" |
| March | 18°F | 36°F | 27°F | 1.0" |
| April | 29°F | 48°F | 38°F | 1.6" |
| May | 40°F | 62°F | 50°F | 3.0" |
| June | 49°F | 72°F | 60°F | 3.7" |
| July | 55°F | 77°F | 66°F | 3.1" |
| August | 55°F | 76°F | 65°F | 2.9" |
| September | 48°F | 68°F | 57°F | 3.9" |
| October | 38°F | 54°F | 46°F | 3.8" |
| November | 27°F | 41°F | 34°F | 2.0" |
| December | 16°F | 28°F | 22°F | 1.3" |
| Index | Ontonagon | Michigan | National |
| Air quality index | 8 | 69 | 42 |
| Pollution index | 4,281,350 | 4,161,606 | 2,726,193 |
| Measurement | Total |
| Days measured | 59 |
| Days with good air quality | 59 |
| Days with moderate air quality | 0 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.002% |
| Benzene | 0.040% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.010% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| White Pine, MI | 446 | 8 | 84.0% |
| Ontonagon, MI | 1,474 | 8 | 84.0% |
| City | Population | Air Quality Index | National Avg. |
| Lebec, CA | 1,474 | 67 | 34.0% |
| Alloway, NJ | 1,474 | 40 | 20.0% |
| Poultney, VT | 1,474 | 36 | 28.0% |
| Armour, ON | 1,474 | n/a | |
| Osler, SK | 1,474 | n/a | |
| Ontonagon, MI | 1,474 | 8 | 84.0% |
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