| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 23°F | 42°F | 32°F | 3.2" |
| February | 24°F | 43°F | 33°F | 2.5" |
| March | 34°F | 56°F | 44°F | 3.9" |
| April | 43°F | 68°F | 55°F | 4.1" |
| May | 51°F | 75°F | 63°F | 4.1" |
| June | 59°F | 82°F | 70°F | 5.3" |
| July | 63°F | 84°F | 73°F | 6.0" |
| August | 61°F | 84°F | 72°F | 3.6" |
| September | 55°F | 78°F | 66°F | 3.5" |
| October | 44°F | 67°F | 55°F | 3.6" |
| November | 34°F | 56°F | 44°F | 2.3" |
| December | 29°F | 47°F | 37°F | 4.2" |
| Index | West Union | West Virginia | National |
| Air quality index | 31 | 126 | 42 |
| Pollution index | 505,265 | 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 | 0.003% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.002% |
| Mercury | 0.010% |
| City | Population | Air Quality Index | National Avg. |
| Middlebourne, WV | 717 | 31 | 38.0% |
| Pullman, WV | 265 | 31 | 38.0% |
| Smithfield, WV | 169 | 31 | 38.0% |
| Auburn, WV | 96 | 31 | 38.0% |
| Salem, WV | 1,862 | 31 | 38.0% |
| West Union, WV | 1,023 | 31 | 38.0% |
| City | Population | Air Quality Index | National Avg. |
| Monte Rio, CA | 1,023 | 34 | 32.0% |
| Otterbein, IN | 1,023 | 42 | 16.0% |
| Exeter, MO | 1,023 | 18 | 64.0% |
| Orient, NY | 1,023 | 37 | 26.0% |
| Emerald Bay, TX | 1,023 | 36 | 28.0% |
| West Union, WV | 1,023 | 31 | 38.0% |
Here are the best places to live in West Virginia
Most Dangerous States In The US
These are the 10 cheapest cities in West Virginia
Most Dangerous Cities In The US