| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 20°F | 43°F | 30°F | 0.6" |
| February | 23°F | 47°F | 34°F | 1.2" |
| March | 35°F | 60°F | 46°F | 2.5" |
| April | 45°F | 70°F | 56°F | 4.4" |
| May | 54°F | 77°F | 65°F | 5.6" |
| June | 65°F | 88°F | 76°F | 5.2" |
| July | 69°F | 92°F | 79°F | 4.2" |
| August | 67°F | 90°F | 77°F | 4.9" |
| September | 58°F | 82°F | 69°F | 4.1" |
| October | 46°F | 71°F | 57°F | 3.8" |
| November | 34°F | 58°F | 45°F | 1.5" |
| December | 23°F | 44°F | 33°F | 1.6" |
| Index | Melvern | Kansas | National |
| Air quality index | 22 | 47 | 42 |
| Pollution index | 1,288,380 | 989,153 | 2,726,193 |
| Measurement | Total |
| Days measured | 60 |
| Days with good air quality | 55 |
| Days with moderate air quality | 4 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.005% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Harris, KS | 8 | 22 | 56.0% |
| Olivet, KS | 62 | 22 | 56.0% |
| Waverly, KS | 641 | 22 | 56.0% |
| Williamsburg, KS | 342 | 22 | 56.0% |
| Osage City, KS | 2,804 | 22 | 56.0% |
| Melvern, KS | 368 | 22 | 56.0% |
| City | Population | Air Quality Index | National Avg. |
| Nord, CA | 368 | 46 | 8.0% |
| Yale, IA | 368 | 39 | 22.0% |
| Petersburg, KY | 368 | 54 | 8.0% |
| St. Maurice, LA | 368 | 30 | 40.0% |
| Accident, MD | 368 | 36 | 28.0% |
| Melvern, KS | 368 | 22 | 56.0% |
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