| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | -1°F | 20°F | 9°F | 0.4" |
| February | 1°F | 24°F | 12°F | 0.4" |
| March | 18°F | 39°F | 28°F | 1.1" |
| April | 31°F | 55°F | 42°F | 2.1" |
| May | 43°F | 68°F | 55°F | 3.1" |
| June | 53°F | 77°F | 65°F | 4.1" |
| July | 58°F | 82°F | 70°F | 4.3" |
| August | 56°F | 79°F | 67°F | 2.6" |
| September | 48°F | 71°F | 59°F | 2.7" |
| October | 36°F | 56°F | 45°F | 2.6" |
| November | 22°F | 40°F | 30°F | 0.8" |
| December | 6°F | 23°F | 14°F | 0.6" |
| Index | Wadena | Minnesota | National |
| Air quality index | 29 | 35 | 42 |
| Pollution index | 1,102,500 | 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 | 0.001% |
| Lead | 0.010% |
| Mercury | 0.003% |
| City | Population | Air Quality Index | National Avg. |
| Bertha, MN | 569 | 29 | 42.0% |
| Deer Creek, MN | 195 | 29 | 42.0% |
| Staples, MN | 2,613 | 29 | 42.0% |
| Hewitt, MN | 232 | 29 | 42.0% |
| New York Mills, MN | 1,249 | 29 | 42.0% |
| Wadena, MN | 4,145 | 29 | 42.0% |
| City | Population | Air Quality Index | National Avg. |
| Aumsville, OR | 4,145 | 32 | 36.0% |
| Aldan, PA | 4,146 | 51 | 2.0% |
| Shelburne, NS | 4,143 | n/a | |
| Monongahela, PA | 4,142 | 56 | 12.0% |
| Reiffton, PA | 4,142 | 42 | 16.0% |
| Wadena, MN | 4,145 | 29 | 42.0% |
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