| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 4°F | 22°F | 13°F | 1.1" |
| February | 6°F | 25°F | 15°F | 3.4" |
| March | 20°F | 39°F | 28°F | 3.6" |
| April | 33°F | 53°F | 42°F | 3.5" |
| May | 44°F | 67°F | 55°F | 9.2" |
| June | 55°F | 77°F | 66°F | 9.6" |
| July | 58°F | 81°F | 69°F | 7.8" |
| August | 56°F | 78°F | 67°F | 10.6" |
| September | 51°F | 74°F | 62°F | 4.7" |
| October | 37°F | 58°F | 47°F | 5.4" |
| November | 23°F | 42°F | 32°F | 5.0" |
| December | 10°F | 25°F | 17°F | 1.9" |
| Index | Roscoe | 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. |
| Paynesville, MN | 2,525 | 32 | 36.0% |
| Watkins, MN | 859 | 32 | 36.0% |
| Meire Grove, MN | 167 | 32 | 36.0% |
| Spring Hill, MN | 105 | 32 | 36.0% |
| St. Martin, MN | 356 | 32 | 36.0% |
| Roscoe, MN | 131 | 32 | 36.0% |
| City | Population | Air Quality Index | National Avg. |
| Lester, AL | 131 | 27 | 46.0% |
| St. Paul, AR | 131 | 44 | 12.0% |
| Genoa, CO | 131 | 45 | 10.0% |
| Hartwick, IA | 131 | 39 | 22.0% |
| Marne, IA | 131 | 40 | 20.0% |
| Roscoe, MN | 131 | 32 | 36.0% |
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