| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 20°F | 34°F | 26°F | 2.8" |
| February | 20°F | 36°F | 27°F | 2.4" |
| March | 31°F | 52°F | 40°F | 4.8" |
| April | 40°F | 63°F | 50°F | 3.3" |
| May | 49°F | 74°F | 60°F | 4.6" |
| June | 57°F | 81°F | 68°F | 5.5" |
| July | 61°F | 85°F | 72°F | 6.5" |
| August | 59°F | 83°F | 70°F | 4.0" |
| September | 53°F | 76°F | 63°F | 3.8" |
| October | 43°F | 63°F | 52°F | 3.5" |
| November | 33°F | 53°F | 42°F | 3.6" |
| December | 25°F | 40°F | 31°F | 3.3" |
| Index | Slippery Rock | Pennsylvania | National |
| Air quality index | 31 | 45 | 42 |
| Pollution index | 601,986 | 4,584,805 | 2,726,193 |
| Measurement | Total |
| Days measured | 361 |
| Days with good air quality | 356 |
| Days with moderate air quality | 5 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.010% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| West Sunbury, PA | 242 | 31 | 38.0% |
| Unionville borough, PA | 232 | 31 | 38.0% |
| Butler, PA | 13,008 | 31 | 38.0% |
| Ellwood City, PA | 7,436 | 31 | 38.0% |
| Mercer, PA | 1,755 | 31 | 38.0% |
| Slippery Rock, PA | 3,526 | 31 | 38.0% |
| City | Population | Air Quality Index | National Avg. |
| East Hampton, CT | 3,526 | 41 | 18.0% |
| Princess Anne, MD | 3,525 | 36 | 28.0% |
| Hubbard, OR | 3,527 | 32 | 36.0% |
| Dahlgren, VA | 3,528 | 47 | 6.0% |
| Studholm, NB | 3,528 | n/a | |
| Slippery Rock, PA | 3,526 | 31 | 38.0% |
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