| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 26°F | 40°F | 33°F | 10.7" |
| February | 21°F | 34°F | 28°F | 2.7" |
| March | 31°F | 48°F | 40°F | 6.7" |
| April | 39°F | 59°F | 51°F | 4.2" |
| May | 48°F | 71°F | 62°F | 4.3" |
| June | 59°F | 80°F | 72°F | 7.9" |
| July | 63°F | 82°F | 74°F | 6.2" |
| August | 64°F | 82°F | 75°F | 13.8" |
| September | 56°F | 78°F | 69°F | 6.2" |
| October | 47°F | 66°F | 57°F | 6.5" |
| November | 35°F | 53°F | 44°F | 5.9" |
| December | 27°F | 38°F | 33°F | 2.9" |
| Index | Connellsville | Pennsylvania | National |
| Air quality index | 36 | 45 | 42 |
| Pollution index | 889,808 | 4,584,805 | 2,726,193 |
| Measurement | Total |
| Days measured | 359 |
| Days with good air quality | 340 |
| Days with moderate air quality | 19 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.030% |
| Mercury | 0.030% |
| City | Population | Air Quality Index | National Avg. |
| Buffington, PA | 89 | 36 | 28.0% |
| Ohiopyle, PA | 34 | 36 | 28.0% |
| Smithfield, PA | 981 | 36 | 28.0% |
| Dunbar, PA | 1,004 | 36 | 28.0% |
| South Connellsville, PA | 1,636 | 36 | 28.0% |
| Connellsville, PA | 7,414 | 36 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| DuBois, PA | 7,413 | 33 | 34.0% |
| Tappan, NY | 7,415 | 51 | 2.0% |
| Chesterland, OH | 7,415 | 50 | = 100 |
| Bargersville, IN | 7,417 | 54 | 8.0% |
| Swainsboro, GA | 7,418 | 47 | 6.0% |
| Connellsville, PA | 7,414 | 36 | 28.0% |
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