| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 26°F | 45°F | 35°F | 4.9" |
| February | 27°F | 47°F | 36°F | 2.4" |
| March | 35°F | 58°F | 45°F | 3.4" |
| April | 43°F | 70°F | 56°F | 3.2" |
| May | 51°F | 77°F | 63°F | 6.1" |
| June | 60°F | 84°F | 71°F | 6.8" |
| July | 63°F | 87°F | 74°F | 8.1" |
| August | 62°F | 86°F | 73°F | 4.8" |
| September | 55°F | 80°F | 66°F | 6.1" |
| October | 45°F | 69°F | 55°F | 5.8" |
| November | 35°F | 57°F | 45°F | 1.9" |
| December | 30°F | 49°F | 38°F | 3.6" |
| Index | Franklin | West Virginia | National |
| Air quality index | 36 | 126 | 42 |
| Pollution index | 1,127,940 | 1,996,538 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 349 |
| Days with moderate air quality | 16 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.060% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.020% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Brandywine, WV | 158 | 36 | 28.0% |
| Whitmer, WV | 82 | 36 | 28.0% |
| Franklin, WV | 527 | 36 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| Crawfordsville, AR | 527 | 45 | 10.0% |
| Thompsonville, IL | 527 | 43 | 14.0% |
| Amo, IN | 527 | 54 | 8.0% |
| Hillsboro, IN | 527 | 42 | 16.0% |
| Markleville, IN | 527 | 42 | 16.0% |
| Franklin, WV | 527 | 36 | 28.0% |
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