Seasonal Occurrence Tables
Previously published in Pennsylvania Birds, the Seasonal Occurrence Tables list the dates of occurrence of most species on a county-by-county basis. The data are not meant to represent a definitive picture of a species' abundance and occurrence, but a snapshot. However, when viewed over many years, the cumulative weight of the data should reveal broad trends.
They were discontinued in 2013.
The Spring and Fall tables list the first and last dates that species were recorded.
The Breeding Season table records the breeding status of each species in a county.
The codes used are the same as those used in the Breeding Bird Atlas: PO = Possible, PR = Probable, CO = Confirmed.
Note: If a species is not reported, that does not mean it wasn't there.
These tables are in Adobe Acrobat format and can be printed or downloaded to your computer or viewed on-screen.
2012
Spring Migration - March through May 2012
2011
Spring Migration - March through May 2011
Fall Migration - August through November 2011
2010
Spring Migration - March through May 2010
Fall Migration - August through November 2010
2009
Spring Migration - March through May 2009
Fall Migration - August through November 2009
2008
Spring Migration - March through May 2008
Fall Migration - August through November 2008
2007
Spring Migration - March through May 2007
Fall Migration - August through November 2007
2006
Spring Migration - March through May 2006
Fall Migration - August through November 2006
2005
Spring Migration - March through May 2005
Breeding Birds - June through July 2005
Fall Migration - August through November 2005