| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 16°F | 28°F | 22°F | 2.0" |
| February | 14°F | 27°F | 20°F | 0.7" |
| March | 22°F | 37°F | 29°F | 3.3" |
| April | 33°F | 48°F | 39°F | 3.7" |
| May | 42°F | 61°F | 51°F | 3.9" |
| June | 52°F | 69°F | 60°F | 5.3" |
| July | 59°F | 75°F | 66°F | 5.8" |
| August | 59°F | 74°F | 66°F | 4.5" |
| September | 53°F | 68°F | 60°F | 4.5" |
| October | 43°F | 56°F | 49°F | 5.0" |
| November | 33°F | 44°F | 38°F | 3.6" |
| December | 22°F | 32°F | 27°F | 3.6" |
| Index | Mackinac Island | 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. |
| St. Ignace, MI | 2,133 | 32 | 36.0% |
| Carp Lake, MI | 525 | 32 | 36.0% |
| Cheboygan, MI | 4,725 | 32 | 36.0% |
| Mackinaw City, MI | 704 | 32 | 36.0% |
| Mackinac Island, MI | 992 | 32 | 36.0% |
| City | Population | Air Quality Index | National Avg. |
| Rossville, KS | 992 | 41 | 18.0% |
| Stamping Ground, KY | 992 | 42 | 16.0% |
| Eureka, SD | 992 | 20 | 60.0% |
| Alexandria, TN | 992 | 25 | 50.0% |
| Allardt, TN | 992 | 53 | 6.0% |
| Mackinac Island, MI | 992 | 32 | 36.0% |
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