| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 27°F | 47°F | 36°F | 2.6" |
| February | 30°F | 50°F | 39°F | 10.5" |
| March | 41°F | 62°F | 50°F | 6.8" |
| April | 50°F | 71°F | 60°F | 5.0" |
| May | 58°F | 77°F | 67°F | 7.5" |
| June | 69°F | 88°F | 78°F | 11.1" |
| July | 72°F | 92°F | 81°F | 4.9" |
| August | 70°F | 92°F | 80°F | 10.2" |
| September | 62°F | 83°F | 71°F | 16.4" |
| October | 50°F | 72°F | 60°F | 4.3" |
| November | 40°F | 60°F | 48°F | 5.8" |
| December | 31°F | 48°F | 39°F | 2.5" |
| Index | Franklin | Kansas | National |
| Air quality index | 37 | 47 | 42 |
| Pollution index | 849,205 | 989,153 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 324 |
| Days with moderate air quality | 40 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.003% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Frontenac, KS | 3,398 | 37 | 26.0% |
| Burgess, MO | 33 | 37 | 26.0% |
| Chicopee, KS | 533 | 37 | 26.0% |
| Mulberry, KS | 424 | 37 | 26.0% |
| Liberal, MO | 674 | 37 | 26.0% |
| Franklin, KS | 617 | 37 | 26.0% |
| City | Population | Air Quality Index | National Avg. |
| Bradley, AR | 617 | 39 | 22.0% |
| Peck, MI | 617 | 38 | 24.0% |
| Ivanhoe, MN | 617 | 32 | 36.0% |
| Lidgerwood, ND | 617 | 33 | 34.0% |
| Bowman, SC | 617 | 29 | 42.0% |
| Franklin, KS | 617 | 37 | 26.0% |
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