| 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 | Big Falls | 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. |
| Littlefork, MN | 728 | 35 | 30.0% |
| Big Falls, MN | 211 | 35 | 30.0% |
| City | Population | Air Quality Index | National Avg. |
| Bear Valley, CA | 211 | 48 | 4.0% |
| Glen Ridge, FL | 211 | 36 | 28.0% |
| Coulter, IA | 211 | 15 | 70.0% |
| Sherrill, IA | 211 | 29 | 42.0% |
| Bloomington, ID | 211 | 44 | 12.0% |
| Big Falls, MN | 211 | 35 | 30.0% |