| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 1°F | 20°F | 10°F | 2.1" |
| February | 8°F | 27°F | 17°F | 0.9" |
| March | 22°F | 40°F | 30°F | 5.4" |
| April | 35°F | 54°F | 43°F | 5.4" |
| May | 46°F | 70°F | 57°F | 2.4" |
| June | 56°F | 76°F | 65°F | 4.9" |
| July | 62°F | 83°F | 72°F | 6.3" |
| August | 58°F | 80°F | 68°F | 8.1" |
| September | 49°F | 71°F | 59°F | 8.6" |
| October | 38°F | 58°F | 47°F | 5.1" |
| November | 25°F | 41°F | 32°F | 2.8" |
| December | 8°F | 24°F | 15°F | 1.2" |
| Index | Hewitt | 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. |
| Wadena, MN | 4,145 | 29 | 42.0% |
| Parkers Prairie, MN | 1,119 | 29 | 42.0% |
| Clarissa, MN | 637 | 29 | 42.0% |
| Bluffton, MN | 218 | 29 | 42.0% |
| Aldrich, MN | 44 | 29 | 42.0% |
| Hewitt, MN | 232 | 29 | 42.0% |
| City | Population | Air Quality Index | National Avg. |
| Tetlin, AK | 232 | 38 | 24.0% |
| Gordonville, AL | 232 | 52 | 4.0% |
| Haivana Nakya, AZ | 232 | 47 | 6.0% |
| Blakesburg, IA | 232 | 39 | 22.0% |
| Fenton, IA | 232 | 15 | 70.0% |
| Hewitt, MN | 232 | 29 | 42.0% |
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