| 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 | Frank | West Virginia | National |
| Air quality index | 36 | 126 | 42 |
| Pollution index | 968,752 | 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 | 0.002% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.010% |
| Mercury | 0.004% |
| City | Population | Air Quality Index | National Avg. |
| Mill Creek, WV | 843 | 31 | 38.0% |
| Huttonsville, WV | 129 | 31 | 38.0% |
| Valley Head, WV | 168 | 31 | 38.0% |
| Monterey, VA | 174 | 36 | 28.0% |
| Bartow, WV | 79 | 36 | 28.0% |
| Frank, WV | 52 | 36 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| Chignik Lake, AK | 52 | 31 | 38.0% |
| Chistochina, AK | 52 | 31 | 38.0% |
| Koyukuk, AK | 52 | 38 | 24.0% |
| Everton, AR | 52 | 36 | 28.0% |
| Ponderosa, CA | 52 | 66 | 32.0% |
| Frank, WV | 52 | 36 | 28.0% |
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