| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 6°F | 24°F | 15°F | 1.9" |
| February | 3°F | 25°F | 14°F | 2.5" |
| March | 19°F | 41°F | 29°F | 1.9" |
| April | 31°F | 56°F | 43°F | 3.9" |
| May | 42°F | 67°F | 55°F | 4.9" |
| June | 54°F | 78°F | 66°F | 4.9" |
| July | 58°F | 81°F | 70°F | 8.9" |
| August | 56°F | 78°F | 67°F | 8.7" |
| September | 50°F | 73°F | 61°F | 5.1" |
| October | 36°F | 58°F | 47°F | 3.9" |
| November | 24°F | 43°F | 32°F | 3.8" |
| December | 12°F | 27°F | 20°F | 1.4" |
| Index | Royalton | Minnesota | National |
| Air quality index | 32 | 35 | 42 |
| Pollution index | 1,174,010 | 1,854,519 | 2,726,193 |
| Measurement | Total |
| Days measured | 344 |
| Days with good air quality | 313 |
| Days with moderate air quality | 31 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.002% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.001% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Genola, MN | 84 | 29 | 42.0% |
| Flensburg, MN | 218 | 29 | 42.0% |
| Lastrup, MN | 146 | 29 | 42.0% |
| Little Falls, MN | 8,663 | 29 | 42.0% |
| Pierz, MN | 1,573 | 29 | 42.0% |
| Royalton, MN | 1,186 | 32 | 36.0% |
| City | Population | Air Quality Index | National Avg. |
| Sand Point, AK | 1,186 | 31 | 38.0% |
| Roseland, LA | 1,186 | 30 | 40.0% |
| Boley, OK | 1,186 | 36 | 28.0% |
| North Apollo, PA | 1,186 | 38 | 24.0% |
| Wayne, WV | 1,186 | 42 | 16.0% |
| Royalton, MN | 1,186 | 32 | 36.0% |
Here are the best places to live in Minnesota
Safest Cities In The US
Check out the 10 safest cities in Minnesota
Check out the 10 most dangerous cities in Minnesota