| 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 | Bayard | West Virginia | National |
| Air quality index | 36 | 126 | 42 |
| Pollution index | 1,427,850 | 1,996,538 | 2,726,193 |
| Measurement | Total |
| Days measured | 364 |
| Days with good air quality | 337 |
| Days with moderate air quality | 27 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.003% |
| Benzene | 0.004% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.001% |
| Mercury | 0.010% |
| City | Population | Air Quality Index | National Avg. |
| Hambleton, WV | 229 | 31 | 38.0% |
| Hendricks, WV | 394 | 31 | 38.0% |
| Deer Park, MD | 332 | 36 | 28.0% |
| Mountain Lake Park, MD | 1,975 | 36 | 28.0% |
| Elk Garden, WV | 197 | 36 | 28.0% |
| Bayard, WV | 241 | 36 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| Homewood Canyon, CA | 241 | 15 | 70.0% |
| Lanare, CA | 241 | 56 | 12.0% |
| La Motte, IA | 241 | 29 | 42.0% |
| Rose Hill, IA | 241 | 35 | 30.0% |
| Anchor, IL | 241 | 44 | 12.0% |
| Bayard, WV | 241 | 36 | 28.0% |
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