| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 7°F | 24°F | 15°F | 0.7" |
| February | 8°F | 27°F | 17°F | 2.1" |
| March | 24°F | 41°F | 31°F | 2.1" |
| April | 36°F | 57°F | 45°F | 4.9" |
| May | 47°F | 70°F | 58°F | 8.5" |
| June | 58°F | 78°F | 67°F | 8.8" |
| July | 62°F | 83°F | 72°F | 7.0" |
| August | 59°F | 80°F | 69°F | 11.9" |
| September | 52°F | 74°F | 61°F | 5.3" |
| October | 39°F | 59°F | 48°F | 7.7" |
| November | 27°F | 45°F | 35°F | 2.9" |
| December | 12°F | 27°F | 20°F | 2.9" |
| Index | Cosmos | Minnesota | National |
| Air quality index | 32 | 35 | 42 |
| Pollution index | 1,148,020 | 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 | 0.050% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.020% |
| Mercury | 0.020% |
| City | Population | Air Quality Index | National Avg. |
| Darwin, MN | 302 | 32 | 36.0% |
| Olivia, MN | 2,397 | 32 | 36.0% |
| Atwater, MN | 1,141 | 32 | 36.0% |
| Bird Island, MN | 905 | 32 | 36.0% |
| Stewart, MN | 610 | 32 | 36.0% |
| Cosmos, MN | 524 | 32 | 36.0% |
| City | Population | Air Quality Index | National Avg. |
| Orleans, IA | 524 | 32 | 36.0% |
| Washburn, IA | 524 | 39 | 22.0% |
| Keithsburg, IL | 524 | 32 | 36.0% |
| Patriot, IN | 524 | 54 | 8.0% |
| Richmond, KS | 524 | 41 | 18.0% |
| Cosmos, MN | 524 | 32 | 36.0% |
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