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 6 Palmer Z-Index
October-December
Period
Z-Index
Rank
(out of 130)
October-December 2024-0.8429
October-December 20230.9196
October-December 20220.8191
October-December 20210.6087
October-December 20200.2571
October-December 20191.41111
October-December 20182.47126
October-December 2017-0.2848
October-December 20160.4982
October-December 2015-0.4838
October-December 2014-0.1457
October-December 20130.3475
October-December 20121.34109
October-December 20111.13103
October-December 20101.84121
October-December 20090.2571
October-December 20080.5585
October-December 20071.67117
October-December 20060.8894
October-December 20052.23123
October-December 20040.6188
October-December 20031.72119
October-December 20021.40110
October-December 2001-0.9826
October-December 2000-0.4044
October-December 1999-0.6335
October-December 1998-2.088
October-December 19970.0962
October-December 19963.18130
October-December 19951.90122
October-December 1994-0.4143
October-December 19930.7390
October-December 19920.9899
October-December 1991-1.5916
October-December 19902.88128
October-December 1989-0.4341
October-December 1988-1.3720
October-December 1987-0.2751
October-December 19860.9497
October-December 19850.5384
October-December 19840.0060
October-December 19831.44112
October-December 1982-1.8012
October-December 19810.4982
October-December 1980-1.0824
October-December 19790.4276
October-December 19780.1464
October-December 19772.58127
October-December 19761.01102
October-December 19750.2368
October-December 19740.3374
October-December 19731.15104
October-December 19722.34124
October-December 1971-0.8528
October-December 19700.8492
October-December 19691.47114
October-December 19680.4578
October-December 19670.99100
October-December 1966-0.5937
October-December 1965-1.0325
October-December 1964-3.282
October-December 1963-1.4419
October-December 19620.2571
October-December 1961-1.7214
October-December 1960-1.5517
October-December 19592.43125
October-December 1958-0.7032
October-December 1957-0.6733
October-December 19560.4477
October-December 19551.17106
October-December 1954-0.7631
October-December 1953-1.7813
October-December 1952-0.0359
October-December 19510.2773
October-December 19501.71118
October-December 1949-1.9510
October-December 19480.6889
October-December 1947-1.5218
October-December 1946-1.1823
October-December 19451.54115
October-December 1944-0.1656
October-December 19430.8793
October-December 19421.80120
October-December 1941-1.7115
October-December 1940-0.2751
October-December 1939-1.2122
October-December 1938-0.3047
October-December 19371.00101
October-December 1936-0.1058
October-December 19350.5686
October-December 1934-0.6236
October-December 1933-0.4739
October-December 19320.9698
October-December 1931-3.043
October-December 1930-3.371
October-December 19290.9095
October-December 1928-2.088
October-December 19273.04129
October-December 19261.33108
October-December 19250.4780
October-December 1924-2.246
October-December 1923-0.4540
October-December 1922-2.227
October-December 19210.5083
October-December 1920-0.1955
October-December 19190.1566
October-December 1918-0.4341
October-December 19170.4780
October-December 1916-1.2421
October-December 1915-0.2848
October-December 1914-0.8230
October-December 1913-0.2848
October-December 1912-0.3246
October-December 1911-0.2154
October-December 1910-1.9311
October-December 1909-2.585
October-December 1908-2.804
October-December 19071.45113
October-December 19060.1967
October-December 19050.2672
October-December 1904-0.6434
October-December 19031.17106
October-December 19020.0962
October-December 19011.59116
October-December 19000.1566
October-December 1899-0.2751
October-December 18981.28107
October-December 1897-0.3945
October-December 18960.0661
October-December 1895-0.9527

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