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 10 Palmer Z-Index
October-December
Period
Z-Index
Rank
(out of 130)
October-December 2024-0.9022
October-December 2023-0.6336
October-December 20220.0967
October-December 20210.5183
October-December 20200.0462
October-December 20191.14106
October-December 20181.62118
October-December 20170.5885
October-December 20160.8795
October-December 20150.4881
October-December 2014-0.0856
October-December 20131.27110
October-December 20121.43114
October-December 20111.77123
October-December 20101.15107
October-December 20090.1170
October-December 20080.9697
October-December 20071.17108
October-December 20061.67119
October-December 2005-0.3846
October-December 20040.0967
October-December 20031.10104
October-December 2002-0.0360
October-December 2001-0.2352
October-December 2000-0.4144
October-December 1999-0.8626
October-December 1998-2.596
October-December 19970.0361
October-December 19961.47115
October-December 19950.7894
October-December 1994-0.0856
October-December 19931.10104
October-December 19921.60117
October-December 1991-2.715
October-December 19902.59129
October-December 1989-0.5839
October-December 19880.1068
October-December 1987-0.2253
October-December 19860.9899
October-December 19852.47127
October-December 19840.7392
October-December 19831.33111
October-December 1982-0.5641
October-December 19811.12105
October-December 19800.1572
October-December 19790.3979
October-December 19780.7392
October-December 19771.68120
October-December 1976-0.1854
October-December 19750.1170
October-December 19740.1572
October-December 19730.2674
October-December 19721.38112
October-December 1971-0.3547
October-December 19701.95124
October-December 19690.7190
October-December 19681.01100
October-December 19670.7493
October-December 1966-0.2751
October-December 19650.1673
October-December 1964-0.6733
October-December 1963-1.8811
October-December 1962-0.6534
October-December 1961-1.0317
October-December 1960-2.734
October-December 19592.50128
October-December 1958-0.8626
October-December 1957-0.7629
October-December 1956-0.8128
October-December 19550.5183
October-December 19541.76122
October-December 1953-2.993
October-December 1952-1.4314
October-December 19510.3176
October-December 19502.06125
October-December 1949-2.297
October-December 19480.0865
October-December 1947-2.078
October-December 1946-0.6336
October-December 19451.08102
October-December 1944-0.6038
October-December 1943-1.0119
October-December 19422.13126
October-December 1941-0.7031
October-December 1940-0.3547
October-December 1939-0.9520
October-December 1938-1.2716
October-December 19370.6387
October-December 19360.0764
October-December 1935-0.5143
October-December 1934-1.4513
October-December 1933-0.6832
October-December 1932-0.0856
October-December 1931-1.3515
October-December 1930-3.662
October-December 19291.21109
October-December 1928-0.4144
October-December 19272.88130
October-December 19261.70121
October-December 19250.9899
October-December 1924-1.9010
October-December 1923-0.5740
October-December 1922-1.0317
October-December 19210.9496
October-December 1920-0.8824
October-December 19190.6789
October-December 1918-0.0459
October-December 19171.05101
October-December 1916-0.5641
October-December 19150.4080
October-December 1914-0.9221
October-December 19130.3677
October-December 1912-0.2949
October-December 19111.55116
October-December 19100.2975
October-December 1909-1.969
October-December 1908-3.761
October-December 19070.6086
October-December 19060.5284
October-December 19051.42113
October-December 1904-1.4912
October-December 19030.0563
October-December 1902-0.1355
October-December 19010.3878
October-December 1900-0.6534
October-December 1899-0.8725
October-December 18980.6588
October-December 1897-0.2949
October-December 1896-0.7230
October-December 1895-0.8923

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