| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 9°F | 24°F | 16°F | 1.2" |
| February | 11°F | 28°F | 18°F | 2.3" |
| March | 27°F | 44°F | 34°F | 2.2" |
| April | 39°F | 59°F | 47°F | 2.9" |
| May | 50°F | 71°F | 59°F | 4.0" |
| June | 60°F | 80°F | 69°F | 5.5" |
| July | 64°F | 83°F | 73°F | 6.8" |
| August | 61°F | 80°F | 70°F | 6.7" |
| September | 53°F | 74°F | 63°F | 4.4" |
| October | 41°F | 60°F | 49°F | 3.0" |
| November | 28°F | 45°F | 36°F | 2.0" |
| December | 13°F | 28°F | 20°F | 1.4" |
| Index | Mankato | Minnesota | National |
| Air quality index | 46 | 35 | 42 |
| Pollution index | 848,330 | 1,854,519 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 214 |
| Days with moderate air quality | 148 |
| Days w/ poor A.Q. for sensitive groups | 2 |
| Days with unhealthy air quality | 1 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.030% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.003% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Good Thunder, MN | 558 | 15 | 70.0% |
| Vernon Center, MN | 355 | 15 | 70.0% |
| Janesville, MN | 2,502 | 36 | 28.0% |
| Pemberton, MN | 255 | 36 | 28.0% |
| Garden City, MN | 233 | 46 | 8.0% |
| Mankato, MN | 42,685 | 46 | 8.0% |
| City | Population | Air Quality Index | National Avg. |
| Langford, BC | 42,691 | n/a | |
| Jefferson City, MO | 42,670 | 39 | 22.0% |
| Brentwood, TN | 42,700 | 45 | 10.0% |
| Farmers Branch, TX | 42,659 | 51 | 2.0% |
| Burlington, VT | 42,645 | 37 | 26.0% |
| Mankato, MN | 42,685 | 46 | 8.0% |
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