| 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 | Perham | Minnesota | National |
| Air quality index | 33 | 35 | 42 |
| Pollution index | 1,033,170 | 1,854,519 | 2,726,193 |
| Measurement | Total |
| Days measured | 363 |
| Days with good air quality | 327 |
| Days with moderate air quality | 34 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality | 1 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.010% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| New York Mills, MN | 1,249 | 29 | 42.0% |
| Wolf Lake, MN | 41 | 29 | 42.0% |
| Deer Creek, MN | 195 | 29 | 42.0% |
| Ottertail, MN | 531 | 29 | 42.0% |
| Midway, MN | 37 | 29 | 42.0% |
| Perham, MN | 3,506 | 33 | 34.0% |
| City | Population | Air Quality Index | National Avg. |
| Holden Heights, FL | 3,506 | 39 | 22.0% |
| Flagstaff County, AB | 3,506 | n/a | |
| Montrose, MN | 3,505 | 46 | 8.0% |
| Etowah, TN | 3,505 | 30 | 40.0% |
| St. Johns, AZ | 3,507 | 44 | 12.0% |
| Perham, MN | 3,506 | 33 | 34.0% |
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