| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 22°F | 37°F | 29°F | 5.6" |
| February | 23°F | 38°F | 29°F | 5.2" |
| March | 32°F | 48°F | 39°F | 3.4" |
| April | 42°F | 60°F | 50°F | 7.5" |
| May | 51°F | 66°F | 57°F | 7.4" |
| June | 59°F | 73°F | 65°F | 8.8" |
| July | 62°F | 76°F | 68°F | 7.0" |
| August | 61°F | 75°F | 67°F | 6.3" |
| September | 55°F | 69°F | 61°F | 8.5" |
| October | 45°F | 60°F | 51°F | 9.1" |
| November | 34°F | 49°F | 41°F | 5.7" |
| December | 28°F | 42°F | 34°F | 5.3" |
| Index | Cass | West Virginia | National |
| Air quality index | 36 | 126 | 42 |
| Pollution index | 11,851,300 | 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 | 0.090% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.020% |
| Mercury | 0.720% |
| City | Population | Air Quality Index | National Avg. |
| Valley Head, WV | 168 | 31 | 38.0% |
| Frank, WV | 52 | 36 | 28.0% |
| Bartow, WV | 79 | 36 | 28.0% |
| Arbovale, WV | 124 | 36 | 28.0% |
| Durbin, WV | 314 | 36 | 28.0% |
| Cass, WV | 9 | 36 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| Covenant Life, AK | 9 | 20 | 60.0% |
| Stevens Village, AK | 9 | 38 | 24.0% |
| Wiseman, AK | 9 | 38 | 24.0% |
| Berkley, IA | 9 | 37 | 26.0% |
| River Bend, MO | 9 | 47 | 6.0% |
| Cass, WV | 9 | 36 | 28.0% |
Here are the best places to live in West Virginia
These are the 10 cheapest cities in West Virginia
See the best places to live in Cass
These are the largest cities in West Virginia