| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 2°F | 21°F | 10°F | 1.5" |
| February | 5°F | 24°F | 13°F | 0.6" |
| March | 18°F | 40°F | 27°F | 3.9" |
| April | 32°F | 56°F | 42°F | 4.6" |
| May | 44°F | 66°F | 53°F | 4.7" |
| June | 55°F | 77°F | 65°F | 4.7" |
| July | 58°F | 82°F | 69°F | 1.8" |
| August | 55°F | 77°F | 65°F | 2.6" |
| September | 49°F | 70°F | 58°F | 7.8" |
| October | 39°F | 56°F | 46°F | 7.5" |
| November | 24°F | 39°F | 30°F | 3.4" |
| December | 9°F | 23°F | 15°F | 1.4" |
| Index | Coleraine | Minnesota | National |
| Air quality index | 35 | 35 | 42 |
| Pollution index | 2,593,130 | 1,854,519 | 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 | 0.060% |
| Benzene | 0.030% |
| Carbon Tetrachloride | 0.030% |
| Lead | 0.040% |
| Mercury | 0.200% |
| City | Population | Air Quality Index | National Avg. |
| Cohasset, MN | 2,710 | 29 | 42.0% |
| Grand Rapids, MN | 11,218 | 29 | 42.0% |
| La Prairie, MN | 732 | 29 | 42.0% |
| Calumet, MN | 341 | 35 | 30.0% |
| Taconite, MN | 753 | 35 | 30.0% |
| Coleraine, MN | 1,660 | 35 | 30.0% |
| City | Population | Air Quality Index | National Avg. |
| Union City, OH | 1,660 | 6 | 88.0% |
| Larouche, QC | 1,660 | n/a | |
| Bulkley-Nechako E, BC | 1,660 | n/a | |
| Key Vista, FL | 1,659 | 43 | 14.0% |
| Corydon, IA | 1,659 | 39 | 22.0% |
| Coleraine, MN | 1,660 | 35 | 30.0% |
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