| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 19°F | 43°F | 30°F | 3.2" |
| February | 20°F | 44°F | 31°F | 2.5" |
| March | 29°F | 56°F | 41°F | 4.0" |
| April | 37°F | 68°F | 52°F | 4.6" |
| May | 46°F | 74°F | 59°F | 4.8" |
| June | 55°F | 81°F | 67°F | 4.8" |
| July | 59°F | 83°F | 70°F | 6.2" |
| August | 58°F | 83°F | 69°F | 4.2" |
| September | 51°F | 78°F | 63°F | 3.3" |
| October | 40°F | 67°F | 52°F | 4.1" |
| November | 29°F | 57°F | 41°F | 2.8" |
| December | 24°F | 47°F | 35°F | 4.4" |
| Index | Flatwoods | West Virginia | National |
| Air quality index | 31 | 126 | 42 |
| Pollution index | 11,851,300 | 1,996,538 | 2,726,193 |
| Measurement | Total |
| Days measured | 111 |
| Days with good air quality | 101 |
| Days with moderate air quality | 10 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.090% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.020% |
| Mercury | 0.720% |
| City | Population | Air Quality Index | National Avg. |
| Sand Fork, WV | 143 | 31 | 38.0% |
| Gassaway, WV | 1,151 | 31 | 38.0% |
| Sutton, WV | 999 | 31 | 38.0% |
| Burnsville, WV | 645 | 31 | 38.0% |
| Flatwoods, WV | 396 | 31 | 38.0% |
| City | Population | Air Quality Index | National Avg. |
| South Van Horn, AK | 396 | 38 | 24.0% |
| Highland Lake, AL | 396 | 43 | 14.0% |
| Blevins, AR | 396 | 32 | 36.0% |
| Wausau, FL | 396 | 38 | 24.0% |
| Lorimor, IA | 396 | 39 | 22.0% |
| Flatwoods, WV | 396 | 31 | 38.0% |
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