| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | -4°F | 19°F | 7°F | 1.5" |
| February | -3°F | 23°F | 9°F | 0.9" |
| March | 12°F | 38°F | 25°F | 1.6" |
| April | 26°F | 53°F | 40°F | 1.7" |
| May | 38°F | 66°F | 52°F | 3.4" |
| June | 47°F | 75°F | 61°F | 4.3" |
| July | 51°F | 80°F | 66°F | 4.1" |
| August | 49°F | 78°F | 64°F | 2.8" |
| September | 42°F | 70°F | 56°F | 2.9" |
| October | 32°F | 55°F | 43°F | 2.3" |
| November | 19°F | 39°F | 28°F | 1.9" |
| December | 2°F | 22°F | 12°F | 1.2" |
| Index | Littlefork | Minnesota | National |
| Air quality index | 35 | 35 | 42 |
| Pollution index | 1,096,210 | 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 | 0.001% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.020% |
| Lead | 0.030% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| International Falls, MN | 5,876 | 35 | 30.0% |
| Ranier, MN | 630 | 35 | 30.0% |
| Big Falls, MN | 204 | 35 | 30.0% |
| Littlefork, MN | 712 | 35 | 30.0% |
| City | Population | Air Quality Index | National Avg. |
| Duncan, AZ | 712 | 37 | 26.0% |
| Frankford, DE | 712 | 36 | 28.0% |
| Medaryville, IN | 712 | 37 | 26.0% |
| Dunkirk, OH | 712 | 39 | 22.0% |
| Driscoll, TX | 712 | 30 | 40.0% |
| Littlefork, MN | 712 | 35 | 30.0% |
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