| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 31°F | 50°F | 39°F | 4.0" |
| February | 34°F | 53°F | 42°F | 3.7" |
| March | 43°F | 64°F | 53°F | 7.7" |
| April | 52°F | 74°F | 62°F | 7.3" |
| May | 60°F | 80°F | 69°F | 7.6" |
| June | 68°F | 89°F | 78°F | 6.7" |
| July | 71°F | 92°F | 80°F | 5.6" |
| August | 70°F | 91°F | 79°F | 6.5" |
| September | 62°F | 84°F | 72°F | 5.1" |
| October | 51°F | 74°F | 61°F | 4.8" |
| November | 42°F | 62°F | 51°F | 5.3" |
| December | 34°F | 52°F | 42°F | 6.9" |
| Index | Franklin | Arkansas | National |
| Air quality index | 36 | 38 | 42 |
| Pollution index | 823,637 | 1,487,822 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 347 |
| Days with moderate air quality | 18 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.005% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.010% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Highland, AR | 1,232 | 36 | 28.0% |
| Oxford, AR | 694 | 36 | 28.0% |
| Ash Flat, AR | 1,198 | 36 | 28.0% |
| Horseshoe Bend, AR | 2,692 | 36 | 28.0% |
| Sidney, AR | 143 | 36 | 28.0% |
| Franklin, AR | 116 | 36 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| Oakhaven, AR | 116 | 39 | 22.0% |
| Strawberry CDP (Tuolumne County), CA | 116 | 40 | 20.0% |
| Archer, IA | 116 | 35 | 30.0% |
| Elk City, ID | 116 | 29 | 42.0% |
| Broughton, IL | 116 | 43 | 14.0% |
| Franklin, AR | 116 | 36 | 28.0% |
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