| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 6°F | 23°F | 14°F | 1.0" |
| February | 7°F | 26°F | 16°F | 0.6" |
| March | 21°F | 42°F | 31°F | 3.9" |
| April | 35°F | 58°F | 46°F | 5.4" |
| May | 47°F | 69°F | 57°F | 3.3" |
| June | 59°F | 80°F | 69°F | 6.1" |
| July | 62°F | 85°F | 73°F | 3.5" |
| August | 57°F | 80°F | 68°F | 2.4" |
| September | 52°F | 73°F | 62°F | 6.3" |
| October | 42°F | 59°F | 50°F | 7.4" |
| November | 26°F | 41°F | 33°F | 2.3" |
| December | 8°F | 23°F | 16°F | 2.2" |
| Index | Onamia | Minnesota | National |
| Air quality index | 29 | 35 | 42 |
| Pollution index | 1,078,800 | 1,854,519 | 2,726,193 |
| Measurement | Total |
| Days measured | 359 |
| Days with good air quality | 328 |
| Days with moderate air quality | 29 |
| Days w/ poor A.Q. for sensitive groups | 2 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.010% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Isle, MN | 698 | 29 | 42.0% |
| Vineland, MN | 726 | 29 | 42.0% |
| Wahkon, MN | 284 | 29 | 42.0% |
| Hillman, MN | 35 | 29 | 42.0% |
| Onamia, MN | 929 | 29 | 42.0% |
| City | Population | Air Quality Index | National Avg. |
| Seligman, MO | 929 | 44 | 12.0% |
| Amanda, OH | 929 | 46 | 8.0% |
| DeSales University, PA | 929 | 42 | 16.0% |
| Goshen, UT | 929 | 46 | 8.0% |
| Salcha, AK | 930 | 38 | 24.0% |
| Onamia, MN | 929 | 29 | 42.0% |
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