| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 0°F | 19°F | 9°F | 0.6" |
| February | 3°F | 23°F | 12°F | 0.4" |
| March | 17°F | 37°F | 26°F | 0.9" |
| April | 31°F | 53°F | 41°F | 1.8" |
| May | 43°F | 69°F | 56°F | 3.1" |
| June | 54°F | 79°F | 66°F | 4.0" |
| July | 59°F | 84°F | 71°F | 3.5" |
| August | 56°F | 82°F | 69°F | 2.9" |
| September | 48°F | 73°F | 59°F | 2.8" |
| October | 36°F | 58°F | 46°F | 1.3" |
| November | 20°F | 39°F | 29°F | 0.7" |
| December | 5°F | 22°F | 14°F | 0.8" |
| Index | Nielsville | Minnesota | National |
| Air quality index | 33 | 35 | 42 |
| Pollution index | 1,215,340 | 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 | 0.000% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.090% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Beltrami, MN | 96 | 33 | 34.0% |
| Caledonia, ND | 48 | 33 | 34.0% |
| Climax, MN | 218 | 33 | 34.0% |
| Hillsboro, ND | 1,627 | 33 | 34.0% |
| Halstad, MN | 587 | 33 | 34.0% |
| Nielsville, MN | 93 | 33 | 34.0% |
| City | Population | Air Quality Index | National Avg. |
| Diomede, AK | 93 | 38 | 24.0% |
| Sun Valley, AZ | 93 | 44 | 12.0% |
| Glasgow, IL | 93 | 40 | 20.0% |
| Sims, IN | 93 | 37 | 26.0% |
| Highland Beach, MD | 93 | 46 | 8.0% |
| Nielsville, MN | 93 | 33 | 34.0% |
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