| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 23°F | 43°F | 32°F | 3.2" |
| February | 23°F | 44°F | 33°F | 2.5" |
| March | 32°F | 55°F | 43°F | 4.4" |
| April | 41°F | 68°F | 54°F | 4.0" |
| May | 49°F | 73°F | 61°F | 4.7" |
| June | 57°F | 80°F | 68°F | 4.8" |
| July | 61°F | 82°F | 71°F | 5.3" |
| August | 60°F | 81°F | 70°F | 3.9" |
| September | 54°F | 76°F | 64°F | 2.8" |
| October | 43°F | 66°F | 54°F | 3.5" |
| November | 33°F | 56°F | 44°F | 2.5" |
| December | 27°F | 46°F | 36°F | 4.0" |
| Index | Mullens | West Virginia | National |
| Air quality index | 295 | 126 | 42 |
| Pollution index | 655,580 | 1,996,538 | 2,726,193 |
| Measurement | Total |
| Days measured | 120 |
| Days with good air quality | 106 |
| Days with moderate air quality | 14 |
| Days w/ poor A.Q. for sensitive groups | |
| Days with unhealthy air quality |
| Pollutant | Total |
| Arsenic | 0.100% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.003% |
| Lead | 0.010% |
| Mercury | 0.005% |
| City | Population | Air Quality Index | National Avg. |
| Oceana, WV | 1,179 | 295 | 490.0% |
| Corinne, WV | 99 | 295 | 490.0% |
| New Richmond, WV | 289 | 295 | 490.0% |
| Beckley, WV | 16,240 | 295 | 490.0% |
| Eccles, WV | 0 | 295 | 490.0% |
| Mullens, WV | 1,797 | 295 | 490.0% |
| City | Population | Air Quality Index | National Avg. |
| Maysville, GA | 1,796 | 37 | 26.0% |
| Battle Ground, IN | 1,796 | 42 | 16.0% |
| Vevay, IN | 1,798 | 54 | 8.0% |
| Newburgh Heights, OH | 1,798 | 50 | = 100 |
| Somerset, OH | 1,796 | 25 | 50.0% |
| Mullens, WV | 1,797 | 295 | 490.0% |
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