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 4 Palmer Z-Index
September-November
Period
Z-Index
Rank
(out of 130)
September-November 2024-2.119
September-November 2023-0.9830
September-November 2022-0.1858
September-November 20211.55111
September-November 2020-1.4520
September-November 2019-0.2752
September-November 20184.16130
September-November 20170.0267
September-November 2016-1.8913
September-November 2015-0.5940
September-November 2014-0.4842
September-November 20131.16103
September-November 20121.65113
September-November 20113.81129
September-November 20100.4989
September-November 20090.9197
September-November 20080.3080
September-November 2007-1.6518
September-November 20061.40108
September-November 20050.2578
September-November 20042.05122
September-November 20032.58126
September-November 20021.66115
September-November 2001-2.652
September-November 2000-0.2455
September-November 19991.13102
September-November 1998-2.386
September-November 19970.5990
September-November 19962.87127
September-November 19951.06100
September-November 1994-0.2653
September-November 19931.81117
September-November 19920.4786
September-November 1991-1.3423
September-November 19900.4887
September-November 19890.2074
September-November 1988-0.9034
September-November 19871.66115
September-November 1986-0.9432
September-November 19850.3984
September-November 1984-0.3051
September-November 19830.2074
September-November 1982-1.4022
September-November 1981-0.6538
September-November 1980-1.3324
September-November 19792.57125
September-November 1978-1.6119
September-November 19770.3281
September-November 19762.51124
September-November 19753.42128
September-November 1974-0.6538
September-November 1973-0.0563
September-November 1972-0.1260
September-November 19710.9999
September-November 19700.2879
September-November 1969-0.8335
September-November 19680.1671
September-November 19670.0166
September-November 19660.9798
September-November 1965-1.3225
September-November 1964-1.8913
September-November 1963-1.2626
September-November 19620.4989
September-November 1961-1.9112
September-November 1960-0.3948
September-November 1959-0.9133
September-November 1958-0.3150
September-November 1957-0.7537
September-November 19560.8295
September-November 19550.3683
September-November 1954-0.4545
September-November 1953-1.8815
September-November 19521.38107
September-November 1951-0.5541
September-November 19501.18104
September-November 1949-1.0829
September-November 19480.2376
September-November 1947-0.8335
September-November 1946-0.4842
September-November 19451.54110
September-November 1944-0.1260
September-November 19430.2477
September-November 19421.29105
September-November 1941-2.485
September-November 19401.69116
September-November 1939-0.4545
September-November 1938-0.2257
September-November 19372.05122
September-November 1936-1.4321
September-November 19350.3482
September-November 19342.14123
September-November 19330.1370
September-November 19321.96120
September-November 1931-2.504
September-November 1930-3.291
September-November 19291.58112
September-November 1928-0.4247
September-November 19271.51109
September-November 19261.83118
September-November 19250.8496
September-November 1924-0.3249
September-November 19230.2376
September-November 1922-2.603
September-November 19210.0468
September-November 1920-0.0464
September-November 19190.7194
September-November 1918-1.2327
September-November 19171.35106
September-November 1916-0.4842
September-November 1915-0.0165
September-November 1914-2.297
September-November 19130.6892
September-November 19120.1069
September-November 19111.08101
September-November 1910-2.168
September-November 1909-1.8017
September-November 1908-1.9711
September-November 19071.95119
September-November 1906-0.0862
September-November 19050.4485
September-November 1904-0.2455
September-November 1903-0.2653
September-November 19020.7194
September-November 1901-1.2327
September-November 1900-1.8416
September-November 18990.1772
September-November 18980.6491
September-November 1897-0.1858
September-November 1896-0.9531
September-November 1895-1.9910

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