| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 8°F | 26°F | 17°F | 1.7" |
| February | 10°F | 28°F | 18°F | 1.0" |
| March | 24°F | 43°F | 32°F | 2.8" |
| April | 36°F | 58°F | 46°F | 3.4" |
| May | 48°F | 71°F | 58°F | 5.6" |
| June | 58°F | 80°F | 68°F | 6.7" |
| July | 63°F | 84°F | 73°F | 5.9" |
| August | 60°F | 81°F | 69°F | 7.6" |
| September | 52°F | 75°F | 62°F | 6.8" |
| October | 40°F | 60°F | 49°F | 5.7" |
| November | 27°F | 46°F | 35°F | 2.3" |
| December | 12°F | 28°F | 19°F | 2.2" |
| Index | Marshall | Minnesota | National |
| Air quality index | 32 | 35 | 42 |
| Pollution index | 1,069,770 | 1,854,519 | 2,726,193 |
| Measurement | Total |
| Days measured | 362 |
| Days with good air quality | 327 |
| Days with moderate air quality | 35 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.003% |
| Benzene | 0.040% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.020% |
| Mercury | 0.003% |
| City | Population | Air Quality Index | National Avg. |
| Minneota, MN | 1,307 | 32 | 36.0% |
| Cottonwood, MN | 1,180 | 32 | 36.0% |
| Balaton, MN | 601 | 32 | 36.0% |
| Russell, MN | 312 | 32 | 36.0% |
| Milroy, MN | 188 | 32 | 36.0% |
| Marshall, MN | 13,604 | 32 | 36.0% |
| City | Population | Air Quality Index | National Avg. |
| Middlesex, NJ | 13,606 | 41 | 18.0% |
| Canton, IL | 13,600 | 41 | 18.0% |
| Celina, TX | 13,608 | 51 | 2.0% |
| Chelsea, AL | 13,599 | 53 | 6.0% |
| Andover, KS | 13,609 | 40 | 20.0% |
| Marshall, MN | 13,604 | 32 | 36.0% |
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