| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 21°F | 38°F | 29°F | 4.4" |
| February | 21°F | 40°F | 30°F | 3.5" |
| March | 30°F | 52°F | 40°F | 5.0" |
| April | 40°F | 64°F | 51°F | 4.5" |
| May | 49°F | 72°F | 60°F | 6.0" |
| June | 57°F | 79°F | 68°F | 8.6" |
| July | 61°F | 82°F | 71°F | 9.8" |
| August | 59°F | 81°F | 69°F | 6.1" |
| September | 53°F | 76°F | 63°F | 6.0" |
| October | 42°F | 64°F | 52°F | 4.2" |
| November | 32°F | 54°F | 42°F | 3.7" |
| December | 26°F | 43°F | 34°F | 4.5" |
| Index | Claysville | Pennsylvania | National |
| Air quality index | 39 | 45 | 42 |
| Pollution index | 1,410,280 | 4,584,805 | 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 | 0.002% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.001% |
| Mercury | 0.004% |
| City | Population | Air Quality Index | National Avg. |
| Bethlehem, WV | 2,468 | 39 | 22.0% |
| Rayland, OH | 481 | 39 | 22.0% |
| Taylorstown, PA | 260 | 39 | 22.0% |
| Triadelphia, WV | 794 | 39 | 22.0% |
| Beech Bottom, WV | 625 | 39 | 22.0% |
| Claysville, PA | 841 | 39 | 22.0% |
| City | Population | Air Quality Index | National Avg. |
| Pine Hill, AL | 841 | 36 | 28.0% |
| Cleone, CA | 841 | 33 | 34.0% |
| Folsom, LA | 841 | 30 | 40.0% |
| Morehouse, MO | 841 | 26 | 48.0% |
| High Shoals, NC | 841 | 36 | 28.0% |
| Claysville, PA | 841 | 39 | 22.0% |
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