| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 21°F | 46°F | 32°F | 0.4" |
| February | 24°F | 50°F | 35°F | 0.9" |
| March | 35°F | 62°F | 47°F | 1.7" |
| April | 44°F | 71°F | 56°F | 2.6" |
| May | 54°F | 79°F | 66°F | 5.3" |
| June | 65°F | 91°F | 77°F | 4.5" |
| July | 69°F | 95°F | 81°F | 3.1" |
| August | 67°F | 92°F | 78°F | 3.7" |
| September | 58°F | 85°F | 70°F | 1.9" |
| October | 46°F | 73°F | 58°F | 2.1" |
| November | 33°F | 60°F | 45°F | 0.9" |
| December | 22°F | 46°F | 33°F | 1.4" |
| Index | Windom | Kansas | National |
| Air quality index | 40 | 47 | 42 |
| Pollution index | 438,885 | 989,153 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 301 |
| Days with moderate air quality | 64 |
| 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 | 0.001% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Geneseo, KS | 236 | 40 | 20.0% |
| McPherson, KS | 13,066 | 40 | 20.0% |
| Lindsborg, KS | 3,294 | 40 | 20.0% |
| Inman, KS | 1,271 | 40 | 20.0% |
| Marquette, KS | 670 | 40 | 20.0% |
| Windom, KS | 105 | 40 | 20.0% |
| City | Population | Air Quality Index | National Avg. |
| Buckeye, IA | 105 | 37 | 26.0% |
| Tingley, IA | 105 | 39 | 22.0% |
| Unionville, IA | 105 | 39 | 22.0% |
| Lima, IL | 105 | 41 | 18.0% |
| Raglesville, IN | 105 | 1 | 98.0% |
| Windom, KS | 105 | 40 | 20.0% |
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