Weather history and climate summary information is available for the following locations:
- Allentown
- Erie
- Harrisburg
- Philadelphia
- Pittsburgh
- Pittsburgh (pennsylva)
- Scranton
Warmest October Days
The warmest October days in Pennsylvania are:
| Allentown, Pennsylvania | 2007 | 90°F |
| Harrisburg, Pennsylvania | 2007 | 90°F |
| Philadelphia, Pennsylvania | 2007 | 89.1°F |
| Philadelphia, Pennsylvania | 1975 | 88°F |
| Pittsburgh (pennsylva), Pennsylvania | 1986 | 87.1°F |
Coldest October Days
The coldest October days in Pennsylvania were:
| Pittsburgh (pennsylva), Pennsylvania | 1965 | 17.1°F |
| Pittsburgh (pennsylva), Pennsylvania | 1972 | 19.9°F |
| Allentown, Pennsylvania | 1988 | 21°F |
| Pittsburgh, Pennsylvania | 1976 | 21.2°F |
| Pittsburgh (pennsylva), Pennsylvania | 1979 | 21.9°F |
Wettest October Days
The wettest single days in October occurred:
| Pittsburgh (pennsylva), Pennsylvania | 1993 | 8.2 inches |
| Allentown, Pennsylvania | 2010 | 7.1 inches |
| Allentown, Pennsylvania | 2005 | 7.1 inches |
| Erie, Pennsylvania | 1981 | 6.1 inches |
| Philadelphia, Pennsylvania | 2005 | 4.5 inches |