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 2 Palmer Z-Index
October-December
Period
Z-Index
Rank
(out of 130)
October-December 2024-2.632
October-December 20230.6992
October-December 20220.4273
October-December 2021-1.2523
October-December 20200.6389
October-December 20190.7395
October-December 20182.67129
October-December 2017-1.1526
October-December 2016-1.6512
October-December 2015-0.3650
October-December 20140.0260
October-December 2013-0.3151
October-December 20120.7094
October-December 20110.99107
October-December 20100.93102
October-December 20090.7997
October-December 20080.93102
October-December 20071.29116
October-December 20060.6490
October-December 20052.09123
October-December 20040.5583
October-December 20031.77119
October-December 20021.78120
October-December 2001-1.987
October-December 2000-0.6041
October-December 1999-0.6834
October-December 1998-1.7111
October-December 1997-0.5443
October-December 19963.33130
October-December 19951.27114
October-December 1994-0.6337
October-December 19931.26113
October-December 19920.5786
October-December 1991-0.8733
October-December 19901.52118
October-December 1989-0.5144
October-December 1988-0.6536
October-December 1987-0.5144
October-December 19860.6591
October-December 19850.0462
October-December 1984-1.1028
October-December 19832.64128
October-December 1982-1.3321
October-December 1981-0.5046
October-December 1980-1.6113
October-December 19790.4876
October-December 1978-0.3849
October-December 19772.44127
October-December 19760.91100
October-December 19750.0563
October-December 1974-0.5642
October-December 19730.7094
October-December 19722.38125
October-December 19710.1465
October-December 19701.11109
October-December 19690.5583
October-December 1968-0.2852
October-December 19670.2868
October-December 1966-0.2554
October-December 1965-1.1825
October-December 1964-2.066
October-December 1963-1.4120
October-December 19620.2969
October-December 1961-1.1327
October-December 1960-1.4818
October-December 19590.99107
October-December 1958-0.6139
October-December 19570.5887
October-December 19560.2366
October-December 19550.5281
October-December 1954-0.2355
October-December 1953-0.2256
October-December 19520.97104
October-December 19512.20124
October-December 19501.48117
October-December 1949-1.5516
October-December 19480.4374
October-December 1947-0.6337
October-December 1946-1.5117
October-December 19450.5786
October-December 1944-0.6139
October-December 19430.98105
October-December 19421.10108
October-December 1941-1.4818
October-December 19400.2467
October-December 1939-1.5715
October-December 19380.3470
October-December 19370.5988
October-December 1936-0.4548
October-December 19350.3772
October-December 19340.0159
October-December 1933-1.3122
October-December 19321.83122
October-December 1931-2.493
October-December 1930-2.661
October-December 19290.5078
October-December 1928-2.245
October-December 19272.41126
October-December 19261.23111
October-December 19250.7796
October-December 1924-1.948
October-December 19230.0058
October-December 1922-2.324
October-December 19210.1164
October-December 19200.5180
October-December 19190.5684
October-December 1918-1.0430
October-December 19170.0361
October-December 1916-0.9232
October-December 1915-0.0457
October-December 1914-1.1028
October-December 19130.4475
October-December 19120.3772
October-December 19111.13110
October-December 1910-0.9531
October-December 1909-1.5914
October-December 1908-1.939
October-December 19071.81121
October-December 19060.95103
October-December 19050.5180
October-December 1904-0.2653
October-December 19030.8999
October-December 19021.28115
October-December 19010.4977
October-December 1900-1.7710
October-December 1899-1.2024
October-December 18981.25112
October-December 18970.8498
October-December 1896-0.5046
October-December 1895-0.6834

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