| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 27°F | 44°F | 35°F | 3.0" |
| February | 27°F | 46°F | 35°F | 2.1" |
| March | 36°F | 56°F | 45°F | 3.8" |
| April | 46°F | 68°F | 56°F | 4.4" |
| May | 53°F | 74°F | 63°F | 4.5" |
| June | 61°F | 81°F | 70°F | 3.9" |
| July | 64°F | 82°F | 72°F | 5.0" |
| August | 64°F | 82°F | 72°F | 3.7" |
| September | 57°F | 76°F | 66°F | 2.9" |
| October | 47°F | 67°F | 56°F | 3.3" |
| November | 37°F | 57°F | 46°F | 2.5" |
| December | 31°F | 48°F | 39°F | 3.6" |
| Index | Gilbert Creek | 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. |
| Omar, WV | 367 | 40 | 20.0% |
| Chauncey, WV | 386 | 40 | 20.0% |
| Switzer, WV | 284 | 40 | 20.0% |
| Accoville, WV | 765 | 295 | 490.0% |
| Bruno, WV | 724 | 295 | 490.0% |
| Gilbert Creek, WV | 1,019 | 295 | 490.0% |
| City | Population | Air Quality Index | National Avg. |
| Leroy, AL | 1,019 | 42 | 16.0% |
| Hebron, MD | 1,019 | 36 | 28.0% |
| Plains, MT | 1,019 | 40 | 20.0% |
| New Salem, ND | 1,019 | 36 | 28.0% |
| Cochranton, PA | 1,019 | 31 | 38.0% |
| Gilbert Creek, WV | 1,019 | 295 | 490.0% |
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