| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 5°F | 22°F | 14°F | 2.7" |
| February | 9°F | 28°F | 18°F | 0.1" |
| March | 24°F | 42°F | 32°F | 1.5" |
| April | 36°F | 55°F | 45°F | 4.7" |
| May | 48°F | 71°F | 59°F | 6.0" |
| June | 58°F | 79°F | 68°F | 5.0" |
| July | 66°F | 86°F | 75°F | 6.5" |
| August | 60°F | 82°F | 71°F | 0.5" |
| September | 47°F | 71°F | 58°F | 6.9" |
| October | 39°F | 60°F | 48°F | 11.4" |
| November | 27°F | 43°F | 34°F | 1.3" |
| December | 12°F | 26°F | 19°F | 1.3" |
| Index | Greenwald | Minnesota | National |
| Air quality index | 32 | 35 | 42 |
| Pollution index | 4,588,720 | 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 | 0.010% |
| Benzene | 0.080% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.040% |
| Mercury | 0.050% |
| City | Population | Air Quality Index | National Avg. |
| St. Martin, MN | 356 | 32 | 36.0% |
| Lake Henry, MN | 86 | 32 | 36.0% |
| Sauk Centre, MN | 4,466 | 32 | 36.0% |
| West Union, MN | 81 | 32 | 36.0% |
| Freeport, MN | 855 | 32 | 36.0% |
| Greenwald, MN | 224 | 32 | 36.0% |
| City | Population | Air Quality Index | National Avg. |
| Brookside, CO | 224 | 16 | 68.0% |
| Jansen, CO | 224 | 20 | 60.0% |
| Ebro, FL | 224 | 38 | 24.0% |
| Victoria, IL | 224 | 41 | 18.0% |
| Ewing, KY | 224 | 42 | 16.0% |
| Greenwald, MN | 224 | 32 | 36.0% |
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