| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 6°F | 24°F | 14°F | 1.1" |
| February | 7°F | 27°F | 16°F | 2.1" |
| March | 20°F | 39°F | 29°F | 3.6" |
| April | 31°F | 49°F | 39°F | 3.9" |
| May | 38°F | 61°F | 48°F | 5.1" |
| June | 47°F | 71°F | 58°F | 6.2" |
| July | 55°F | 80°F | 67°F | 5.7" |
| August | 54°F | 77°F | 65°F | 8.3" |
| September | 47°F | 69°F | 57°F | 5.6" |
| October | 36°F | 56°F | 45°F | 6.2" |
| November | 25°F | 42°F | 33°F | 2.4" |
| December | 11°F | 26°F | 19°F | 3.0" |
| Index | Superior | Wisconsin | National |
| Air quality index | 35 | 69 | 42 |
| Pollution index | 1,760,360 | 2,842,418 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 326 |
| Days with moderate air quality | 38 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.010% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.030% |
| Lead | 0.010% |
| Mercury | 0.002% |
| City | Population | Air Quality Index | National Avg. |
| Carlton, MN | 1,006 | 35 | 30.0% |
| Proctor, MN | 3,039 | 35 | 30.0% |
| Duluth, MN | 85,852 | 35 | 30.0% |
| Wrenshall, MN | 459 | 35 | 30.0% |
| Esko, MN | 2,222 | 35 | 30.0% |
| Superior, WI | 26,260 | 35 | 30.0% |
| City | Population | Air Quality Index | National Avg. |
| Plainview, NY | 26,267 | 51 | 2.0% |
| Galt, CA | 26,235 | 45 | 10.0% |
| Clarksburg, MD | 26,234 | 47 | 6.0% |
| Orchards, WA | 26,289 | 38 | 24.0% |
| Smithtown, NY | 26,197 | 43 | 14.0% |
| Superior, WI | 26,260 | 35 | 30.0% |
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