| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 23°F | 41°F | 31°F | 3.4" |
| February | 24°F | 44°F | 33°F | 5.0" |
| March | 32°F | 55°F | 43°F | 4.1" |
| April | 41°F | 67°F | 53°F | 5.5" |
| May | 49°F | 73°F | 61°F | 6.4" |
| June | 57°F | 80°F | 68°F | 6.5" |
| July | 61°F | 82°F | 71°F | 5.2" |
| August | 60°F | 82°F | 70°F | 4.8" |
| September | 54°F | 76°F | 64°F | 5.1" |
| October | 42°F | 66°F | 53°F | 7.3" |
| November | 32°F | 55°F | 42°F | 3.9" |
| December | 28°F | 46°F | 36°F | 4.8" |
| Index | Summersville | West Virginia | National |
| Air quality index | 295 | 126 | 42 |
| Pollution index | 231,791 | 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 | 0.000% |
| Benzene | 0.003% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Birch River, WV | 116 | 40 | 20.0% |
| Clay, WV | 718 | 40 | 20.0% |
| Ansted, WV | 1,322 | 295 | 490.0% |
| Camden-on-Gauley, WV | 197 | 295 | 490.0% |
| Hico, WV | 167 | 295 | 490.0% |
| Summersville, WV | 3,316 | 295 | 490.0% |
| City | Population | Air Quality Index | National Avg. |
| Andrews AFB, MD | 3,316 | 47 | 6.0% |
| Goldstream, AK | 3,315 | 38 | 24.0% |
| Cutten, CA | 3,315 | 27 | 46.0% |
| Islandia, NY | 3,315 | 43 | 14.0% |
| Moreland Hills, OH | 3,315 | 50 | = 100 |
| Summersville, WV | 3,316 | 295 | 490.0% |
Here are the best places to live in West Virginia
These are the 10 cheapest cities in West Virginia
Check out the 10 most dangerous cities in West Virginia
Check out the 10 safest cities in West Virginia