| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 24°F | 42°F | 32°F | 3.2" |
| February | 25°F | 43°F | 33°F | 2.4" |
| March | 33°F | 55°F | 43°F | 3.9" |
| April | 43°F | 68°F | 55°F | 4.1" |
| May | 52°F | 75°F | 63°F | 4.3" |
| June | 60°F | 82°F | 71°F | 4.8" |
| July | 64°F | 85°F | 74°F | 6.0" |
| August | 63°F | 84°F | 73°F | 4.0" |
| September | 57°F | 79°F | 67°F | 3.2" |
| October | 46°F | 67°F | 56°F | 3.9" |
| November | 36°F | 57°F | 46°F | 2.7" |
| December | 29°F | 46°F | 37°F | 4.1" |
| Index | Cassville | West Virginia | National |
| Air quality index | 36 | 126 | 42 |
| Pollution index | 6,478,770 | 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 | 0.030% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.020% |
| Mercury | 0.210% |
| City | Population | Air Quality Index | National Avg. |
| Rachel, WV | 312 | 31 | 38.0% |
| Carolina, WV | 313 | 31 | 38.0% |
| Fairmont, WV | 18,443 | 31 | 38.0% |
| Farmington, WV | 460 | 31 | 38.0% |
| Rivesville, WV | 833 | 31 | 38.0% |
| Cassville, WV | 1,042 | 36 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| Brantley, AL | 1,042 | 52 | 4.0% |
| Masaryktown, FL | 1,042 | 30 | 40.0% |
| Bethlehem, GA | 1,042 | 44 | 12.0% |
| Hemlock, MI | 1,042 | 26 | 48.0% |
| Cooperstown, ND | 1,042 | 33 | 34.0% |
| Cassville, WV | 1,042 | 36 | 28.0% |
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