| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 9°F | 25°F | 17°F | 1.1" |
| February | 9°F | 26°F | 17°F | 1.0" |
| March | 20°F | 36°F | 28°F | 1.4" |
| April | 31°F | 47°F | 38°F | 2.5" |
| May | 39°F | 56°F | 46°F | 3.0" |
| June | 45°F | 63°F | 52°F | 4.8" |
| July | 53°F | 72°F | 61°F | 3.5" |
| August | 55°F | 71°F | 62°F | 2.4" |
| September | 50°F | 64°F | 56°F | 3.2" |
| October | 39°F | 53°F | 46°F | 3.1" |
| November | 28°F | 41°F | 34°F | 2.4" |
| December | 14°F | 28°F | 21°F | 1.7" |
| Index | Grand Marais | Minnesota | National |
| Air quality index | 8 | 35 | 42 |
| Pollution index | 1,312,450 | 1,854,519 | 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 | 0.030% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.040% |
| Mercury | 0.070% |
| City | Population | Air Quality Index | National Avg. |
| Grand Marais, MN | 1,426 | 8 | 84.0% |
| City | Population | Air Quality Index | National Avg. |
| Green Springs, OH | 1,426 | 40 | 20.0% |
| Wotton, QC | 1,426 | n/a | |
| Magnetawan, ON | 1,426 | n/a | |
| Shellbrook, SK | 1,426 | n/a | |
| North Granby, CT | 1,425 | 40 | 20.0% |
| Grand Marais, MN | 1,426 | 8 | 84.0% |
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