| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 22°F | 38°F | 30°F | 2.9" |
| February | 23°F | 40°F | 30°F | 2.0" |
| March | 32°F | 52°F | 41°F | 3.5" |
| April | 42°F | 65°F | 53°F | 3.3" |
| May | 51°F | 73°F | 62°F | 4.2" |
| June | 59°F | 80°F | 69°F | 4.5" |
| July | 63°F | 84°F | 73°F | 3.6" |
| August | 62°F | 83°F | 72°F | 3.9" |
| September | 55°F | 77°F | 65°F | 3.3" |
| October | 45°F | 65°F | 54°F | 3.6" |
| November | 35°F | 54°F | 44°F | 2.6" |
| December | 27°F | 43°F | 34°F | 3.6" |
| Index | Bethlehem | West Virginia | National |
| Air quality index | 39 | 126 | 42 |
| Pollution index | 15,941,000 | 1,996,538 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 318 |
| Days with moderate air quality | 47 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.070% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.030% |
| Mercury | 1.030% |
| City | Population | Air Quality Index | National Avg. |
| Bellaire, OH | 4,057 | 39 | 22.0% |
| Benwood, WV | 1,381 | 39 | 22.0% |
| Beech Bottom, WV | 625 | 39 | 22.0% |
| Lansing, OH | 496 | 39 | 22.0% |
| Wolfhurst, OH | 1,165 | 39 | 22.0% |
| Bethlehem, WV | 2,468 | 39 | 22.0% |
| City | Population | Air Quality Index | National Avg. |
| Lawson Heights, PA | 2,468 | 39 | 22.0% |
| Holiday Island, AR | 2,467 | 18 | 64.0% |
| Charlevoix, MI | 2,467 | 36 | 28.0% |
| Doniphan, MO | 2,467 | 26 | 48.0% |
| Albany, KY | 2,469 | 40 | 20.0% |
| Bethlehem, WV | 2,468 | 39 | 22.0% |
Here are the best places to live in West Virginia
Top 10 cities in West Virginia with the best education system
Check out the 10 safest cities in West Virginia
See the best places to live in & around Bethlehem