| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 22°F | 39°F | 29°F | 5.1" |
| February | 24°F | 45°F | 33°F | 5.5" |
| March | 37°F | 62°F | 48°F | 4.9" |
| April | 43°F | 67°F | 54°F | 5.2" |
| May | 55°F | 79°F | 67°F | 8.4" |
| June | 66°F | 86°F | 75°F | 10.5" |
| July | 68°F | 91°F | 79°F | 5.2" |
| August | 70°F | 92°F | 80°F | 8.8" |
| September | 60°F | 84°F | 71°F | 6.6" |
| October | 47°F | 70°F | 58°F | 8.4" |
| November | 32°F | 59°F | 44°F | 3.1" |
| December | 20°F | 40°F | 29°F | 2.8" |
| Index | Winchester | Kansas | National |
| Air quality index | 41 | 47 | 42 |
| Pollution index | 1,138,800 | 989,153 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 294 |
| Days with moderate air quality | 70 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 1 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.004% |
| Lead | 0.010% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Ozawkie, KS | 673 | 41 | 18.0% |
| Nortonville, KS | 714 | 41 | 18.0% |
| McLouth, KS | 1,106 | 41 | 18.0% |
| Valley Falls, KS | 1,145 | 41 | 18.0% |
| Oskaloosa, KS | 1,229 | 41 | 18.0% |
| Winchester, KS | 547 | 41 | 18.0% |
| City | Population | Air Quality Index | National Avg. |
| Zearing, IA | 547 | 37 | 26.0% |
| Lake Petersburg, IL | 547 | 40 | 20.0% |
| Benzonia, MI | 547 | 36 | 28.0% |
| Noxapater, MS | 547 | 36 | 28.0% |
| Stanton, TN | 547 | 27 | 46.0% |
| Winchester, KS | 547 | 41 | 18.0% |
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