| 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 | Clarissa | Minnesota | National |
| Air quality index | 29 | 35 | 42 |
| Pollution index | 4,588,720 | 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 | 0.010% |
| Benzene | 0.080% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.040% |
| Mercury | 0.050% |
| City | Population | Air Quality Index | National Avg. |
| Long Prairie, MN | 3,308 | 29 | 42.0% |
| Bertha, MN | 569 | 29 | 42.0% |
| Motley, MN | 570 | 29 | 42.0% |
| Eagle Bend, MN | 641 | 29 | 42.0% |
| Browerville, MN | 914 | 29 | 42.0% |
| Clarissa, MN | 637 | 29 | 42.0% |
| City | Population | Air Quality Index | National Avg. |
| Bunker Hill, IN | 637 | 37 | 26.0% |
| Big Sandy, MT | 637 | 21 | 58.0% |
| Eldred, PA | 637 | 35 | 30.0% |
| Milano, TX | 637 | 42 | 16.0% |
| Neosho, WI | 637 | 37 | 26.0% |
| Clarissa, MN | 637 | 29 | 42.0% |
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