| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 18°F | 42°F | 29°F | 0.6" |
| February | 21°F | 47°F | 32°F | 0.7" |
| March | 31°F | 60°F | 45°F | 1.4" |
| April | 41°F | 68°F | 54°F | 3.0" |
| May | 50°F | 77°F | 63°F | 4.8" |
| June | 62°F | 89°F | 75°F | 4.6" |
| July | 66°F | 93°F | 79°F | 4.2" |
| August | 63°F | 89°F | 76°F | 5.2" |
| September | 55°F | 83°F | 68°F | 3.4" |
| October | 43°F | 71°F | 56°F | 2.5" |
| November | 31°F | 58°F | 43°F | 0.9" |
| December | 19°F | 43°F | 30°F | 1.3" |
| Index | Mankato | Kansas | National |
| Air quality index | 19 | 47 | 42 |
| Pollution index | 190,007 | 989,153 | 2,726,193 |
| Measurement | Total |
| Days measured | 97 |
| Days with good air quality | 92 |
| Days with moderate air quality | 5 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Formoso, KS | 102 | 19 | 62.0% |
| Webber, KS | 18 | 19 | 62.0% |
| Jewell, KS | 390 | 19 | 62.0% |
| Burr Oak, KS | 128 | 19 | 62.0% |
| Esbon, KS | 61 | 19 | 62.0% |
| Mankato, KS | 895 | 19 | 62.0% |
| City | Population | Air Quality Index | National Avg. |
| Buffalo, IN | 895 | 42 | 16.0% |
| Geary, OK | 895 | 48 | 4.0% |
| Courtland, AL | 896 | 41 | 18.0% |
| Menan, ID | 894 | 27 | 46.0% |
| Clay City, IL | 896 | 40 | 20.0% |
| Mankato, KS | 895 | 19 | 62.0% |
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