Please note, Degree Days and Palmer Indices are not available for Alaska or Hawaii. Palmer Drought Severity Index (PDSI), Palmer Hydrological Drought Index (PHDI), and Palmer Modified Drought Index (PMDI) are not offered for multiple-month time scales. Data are available for bulk download.
Base Period
Trend

Filter
Pennsylvania, Climate Division 3 Palmer Z-Index
July-September
Period
Z-Index
Rank
(out of 130)
July-September 2024-1.4419
July-September 20230.6890
July-September 2022-1.5616
July-September 20212.37124
July-September 20200.9896
July-September 2019-0.2058
July-September 20184.43130
July-September 20171.08103
July-September 2016-0.9035
July-September 2015-0.2855
July-September 2014-0.5350
July-September 20130.6487
July-September 2012-0.1959
July-September 20114.09129
July-September 2010-1.0326
July-September 20091.96120
July-September 2008-0.2657
July-September 2007-1.3022
July-September 20060.5583
July-September 2005-1.8111
July-September 20043.58128
July-September 20031.57114
July-September 2002-2.147
July-September 2001-0.9629
July-September 20000.5784
July-September 19990.2673
July-September 1998-1.7313
July-September 1997-0.6443
July-September 19961.52112
July-September 1995-1.5317
July-September 19941.0398
July-September 1993-0.0164
July-September 1992-0.0663
July-September 1991-0.6244
July-September 19900.0766
July-September 19891.28106
July-September 19880.0967
July-September 19870.4476
July-September 1986-0.2855
July-September 19850.8794
July-September 19840.4677
July-September 1983-2.801
July-September 1982-0.9928
July-September 1981-0.5947
July-September 1980-2.393
July-September 19791.37109
July-September 19780.4879
July-September 1977-0.3554
July-September 19760.5583
July-September 19752.75126
July-September 19740.4275
July-September 1973-0.7739
July-September 1972-1.9110
July-September 19712.28122
July-September 1970-0.4951
July-September 19691.37109
July-September 1968-1.8111
July-September 19671.43110
July-September 1966-1.3121
July-September 1965-1.0425
July-September 1964-1.999
July-September 1963-0.9430
July-September 1962-0.7739
July-September 19610.1670
July-September 19601.94118
July-September 1959-0.1760
July-September 19581.07101
July-September 1957-2.652
July-September 19560.7991
July-September 19551.07101
July-September 1954-0.8736
July-September 1953-1.4918
July-September 19521.0499
July-September 1951-0.9430
July-September 19500.1268
July-September 1949-0.6046
July-September 1948-0.3852
July-September 19470.0365
July-September 19460.6789
July-September 19452.62125
July-September 1944-1.6215
July-September 1943-2.324
July-September 19422.34123
July-September 1941-0.9232
July-September 19400.2272
July-September 1939-0.9232
July-September 19382.05121
July-September 19370.1469
July-September 1936-1.2923
July-September 19350.6688
July-September 19341.68115
July-September 19333.32127
July-September 1932-1.7214
July-September 19310.5583
July-September 1930-2.275
July-September 1929-0.5549
July-September 19281.37109
July-September 19270.8693
July-September 19261.51111
July-September 1925-0.3753
July-September 19240.5985
July-September 1923-0.8338
July-September 1922-1.0227
July-September 1921-1.2324
July-September 19200.9695
July-September 19191.96120
July-September 1918-1.3820
July-September 1917-0.0762
July-September 19160.3674
July-September 19151.94118
July-September 1914-0.7442
July-September 1913-0.8736
July-September 19120.4778
July-September 19111.56113
July-September 1910-0.9134
July-September 1909-2.166
July-September 1908-0.0961
July-September 19071.10104
July-September 19060.5480
July-September 19051.0097
July-September 19041.90116
July-September 19031.08103
July-September 19020.8693
July-September 19011.19105
July-September 1900-0.6145
July-September 18990.6286
July-September 1898-0.5748
July-September 18970.1771
July-September 1896-0.7641
July-September 1895-2.108

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