| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 20°F | 49°F | 32°F | 0.8" |
| February | 21°F | 52°F | 35°F | 0.6" |
| March | 31°F | 65°F | 46°F | 1.2" |
| April | 39°F | 72°F | 54°F | 2.7" |
| May | 49°F | 80°F | 64°F | 3.1" |
| June | 61°F | 92°F | 76°F | 3.6" |
| July | 66°F | 96°F | 80°F | 3.2" |
| August | 64°F | 93°F | 77°F | 3.1" |
| September | 55°F | 87°F | 70°F | 1.4" |
| October | 43°F | 75°F | 57°F | 2.3" |
| November | 30°F | 62°F | 44°F | 0.8" |
| December | 20°F | 47°F | 32°F | 1.3" |
| Index | Mullinville | Kansas | National |
| Air quality index | 15 | 47 | 42 |
| Pollution index | 101,056 | 989,153 | 2,726,193 |
| Measurement | Total |
| Days measured | 304 |
| Days with good air quality | 301 |
| Days with moderate air quality | 3 |
| 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. |
| Bucklin, KS | 649 | 15 | 70.0% |
| Greensburg, KS | 772 | 15 | 70.0% |
| Mullinville, KS | 266 | 15 | 70.0% |
| City | Population | Air Quality Index | National Avg. |
| Mentasta Lake, AK | 266 | 38 | 24.0% |
| Cassel, CA | 266 | 42 | 16.0% |
| Hiouchi, CA | 266 | 20 | 60.0% |
| Pineland, FL | 266 | 36 | 28.0% |
| Secor, IL | 266 | 44 | 12.0% |
| Mullinville, KS | 266 | 15 | 70.0% |
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