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

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Pennsylvania, Climate Division 1 Palmer Z-IndexOctober-December18952024190519151925193519451955196519751985199520052015-3.004.00-2.00-1.000.001.002.003.00-3.004.00-2.00-1.000.001.002.003.00ZingChart
Pennsylvania, Climate Division 1 Palmer Z-Index
October-December
Period
Z-Index
Rank
(out of 130)
October-December 2024-1.2921
October-December 20231.14108
October-December 20220.6890
October-December 2021-0.2255
October-December 20200.1771
October-December 20190.6788
October-December 20182.72128
October-December 2017-1.3120
October-December 2016-1.0827
October-December 2015-0.5439
October-December 2014-0.0660
October-December 2013-0.8233
October-December 20120.89105
October-December 20110.8099
October-December 20101.09107
October-December 20090.3176
October-December 20080.7395
October-December 20072.15124
October-December 20060.6890
October-December 20052.50126
October-December 20040.5084
October-December 20032.01123
October-December 20021.94122
October-December 2001-2.067
October-December 2000-0.5538
October-December 1999-1.0130
October-December 1998-2.067
October-December 1997-0.2950
October-December 19963.07129
October-December 19951.30110
October-December 1994-0.5439
October-December 19930.89105
October-December 19920.5185
October-December 1991-0.6635
October-December 19901.71118
October-December 1989-0.2354
October-December 1988-0.6336
October-December 1987-0.4146
October-December 19860.7093
October-December 19850.3577
October-December 1984-1.1025
October-December 19831.84121
October-December 1982-1.7110
October-December 1981-0.4245
October-December 1980-1.3719
October-December 19790.2775
October-December 1978-0.5439
October-December 19772.41125
October-December 19760.82100
October-December 19750.0564
October-December 1974-0.3548
October-December 19731.03106
October-December 19722.69127
October-December 19710.2374
October-December 19700.4379
October-December 19690.87102
October-December 1968-0.0759
October-December 19670.2172
October-December 1966-0.2651
October-December 1965-1.1123
October-December 1964-2.532
October-December 1963-1.5913
October-December 19620.2273
October-December 1961-1.0827
October-December 1960-1.6611
October-December 19591.53115
October-December 1958-0.5043
October-December 19570.5386
October-December 1956-0.2453
October-December 19551.32112
October-December 19540.1771
October-December 1953-0.3449
October-December 19520.8099
October-December 19511.81120
October-December 19501.36114
October-December 1949-1.6112
October-December 19480.4583
October-December 1947-1.0031
October-December 1946-1.759
October-December 19450.7997
October-December 1944-0.5637
October-December 19430.7596
October-December 19421.68116
October-December 1941-1.4218
October-December 19400.3678
October-December 1939-1.5714
October-December 19380.1167
October-December 19370.4481
October-December 1936-0.5142
October-December 19350.6992
October-December 1934-0.1357
October-December 1933-0.7134
October-December 19321.71118
October-December 1931-2.941
October-December 1930-2.264
October-December 19290.7395
October-December 1928-2.255
October-December 19273.19130
October-December 19261.32112
October-December 19250.4481
October-December 1924-1.5316
October-December 19230.0966
October-December 1922-1.5415
October-December 19210.0163
October-December 19200.1669
October-December 19190.6992
October-December 1918-0.8532
October-December 1917-0.0262
October-December 1916-1.1123
October-December 1915-0.3947
October-December 1914-1.1025
October-December 19130.1368
October-December 1912-0.0561
October-December 19110.5887
October-December 1910-1.4417
October-December 1909-2.096
October-December 1908-2.393
October-December 19071.77119
October-December 19060.0564
October-December 1905-0.2552
October-December 1904-0.1656
October-December 19031.35113
October-December 19020.83101
October-December 19010.89105
October-December 1900-1.2921
October-December 1899-1.0529
October-December 18981.17109
October-December 18970.4583
October-December 1896-0.4544
October-December 1895-0.1357

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