| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 10°F | 28°F | 20°F | 1.3" |
| February | 8°F | 29°F | 19°F | 0.7" |
| March | 16°F | 40°F | 28°F | 1.5" |
| April | 29°F | 54°F | 41°F | 2.5" |
| May | 39°F | 68°F | 54°F | 2.8" |
| June | 49°F | 77°F | 63°F | 3.4" |
| July | 53°F | 81°F | 68°F | 2.6" |
| August | 53°F | 79°F | 66°F | 3.3" |
| September | 46°F | 72°F | 59°F | 3.5" |
| October | 37°F | 58°F | 48°F | 4.7" |
| November | 28°F | 46°F | 37°F | 2.7" |
| December | 18°F | 32°F | 26°F | 1.9" |
| Index | Cheboygan | Michigan | National |
| Air quality index | 32 | 69 | 42 |
| Pollution index | 2,221,050 | 4,161,606 | 2,726,193 |
| Measurement | Total |
| Days measured | 58 |
| Days with good air quality | 53 |
| Days with moderate air quality | 5 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.040% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.010% |
| Mercury | 0.003% |
| City | Population | Air Quality Index | National Avg. |
| Mackinaw City, MI | 704 | 32 | 36.0% |
| Carp Lake, MI | 525 | 32 | 36.0% |
| Mackinac Island, MI | 992 | 32 | 36.0% |
| Indian River, MI | 2,019 | 36 | 28.0% |
| Cheboygan, MI | 4,725 | 32 | 36.0% |
| City | Population | Air Quality Index | National Avg. |
| Bloomfield, WI | 4,725 | 37 | 26.0% |
| Gang Mills, NY | 4,723 | 35 | 30.0% |
| Rocky Mount, VA | 4,727 | 38 | 24.0% |
| Ellisburg, NJ | 4,722 | 51 | 2.0% |
| Santa Ynez, CA | 4,728 | 44 | 12.0% |
| Cheboygan, MI | 4,725 | 32 | 36.0% |
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