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 3 Palmer Z-IndexDecember-February18962025190619161926193619461956196619761986199620062016-3.004.00-2.00-1.000.001.002.003.00-3.004.00-2.00-1.000.001.002.003.00ZingChart
Pennsylvania, Climate Division 3 Palmer Z-Index
December-February
Period
Z-Index
Rank
(out of 130)
December 2024-February 2025-1.565
December 2023-February 20242.14125
December 2022-February 2023-0.2253
December 2021-February 2022-0.8819
December 2020-February 20210.99102
December 2019-February 20200.1272
December 2018-February 20191.22113
December 2017-February 20180.7493
December 2016-February 2017-1.357
December 2015-February 20161.08106
December 2014-February 2015-0.4542
December 2013-February 20141.47118
December 2012-February 20130.2483
December 2011-February 2012-0.6424
December 2010-February 2011-0.2850
December 2009-February 20101.23114
December 2008-February 2009-0.1756
December 2007-February 20081.34116
December 2006-February 2007-0.6424
December 2005-February 20060.3386
December 2004-February 20050.4388
December 2003-February 20040.2483
December 2002-February 20031.16109
December 2001-February 2002-2.931
December 2000-February 20010.0062
December 1999-February 2000-0.3347
December 1998-February 1999-0.4641
December 1997-February 19980.6191
December 1996-February 19971.00103
December 1995-February 19960.6392
December 1994-February 1995-0.2850
December 1993-February 19941.75121
December 1992-February 1993-0.2054
December 1991-February 1992-1.1212
December 1990-February 19910.0767
December 1989-February 1990-0.5632
December 1988-February 1989-1.0813
December 1987-February 1988-0.4143
December 1986-February 19870.2584
December 1985-February 19860.1170
December 1984-February 1985-1.2010
December 1983-February 19841.69119
December 1982-February 1983-0.5731
December 1981-February 19820.4889
December 1980-February 1981-1.2010
December 1979-February 1980-1.952
December 1978-February 19793.94130
December 1977-February 19782.21126
December 1976-February 1977-1.376
December 1975-February 19760.2179
December 1974-February 19751.22113
December 1973-February 19740.97101
December 1972-February 19731.30115
December 1971-February 19720.0263
December 1970-February 19711.10107
December 1969-February 19700.2885
December 1968-February 1969-1.298
December 1967-February 1968-0.4938
December 1966-February 1967-0.7821
December 1965-February 1966-0.4938
December 1964-February 1965-0.1657
December 1963-February 19640.2179
December 1962-February 1963-0.7821
December 1961-February 19620.2483
December 1960-February 1961-0.1855
December 1959-February 19600.7994
December 1958-February 1959-1.269
December 1957-February 19581.77123
December 1956-February 1957-0.3845
December 1955-February 1956-0.7523
December 1954-February 1955-0.9517
December 1953-February 1954-0.8620
December 1952-February 19531.03105
December 1951-February 19520.9399
December 1950-February 19511.02104
December 1949-February 1950-0.3148
December 1948-February 19491.74120
December 1947-February 1948-0.2850
December 1946-February 1947-0.5336
December 1945-February 1946-0.4840
December 1944-February 19450.2075
December 1943-February 1944-1.0515
December 1942-February 19430.0564
December 1941-February 1942-0.6424
December 1940-February 1941-0.5435
December 1939-February 1940-1.0316
December 1938-February 19391.21111
December 1937-February 1938-0.9318
December 1936-February 19371.19110
December 1935-February 19360.96100
December 1934-February 1935-0.0261
December 1933-February 1934-0.5830
December 1932-February 1933-0.5929
December 1931-February 1932-1.0813
December 1930-February 1931-1.913
December 1929-February 1930-0.4143
December 1928-February 1929-0.3049
December 1927-February 19280.8195
December 1926-February 1927-0.5336
December 1925-February 19260.0564
December 1924-February 1925-0.1558
December 1923-February 19241.42117
December 1922-February 1923-0.6228
December 1921-February 1922-0.6424
December 1920-February 19210.3487
December 1919-February 1920-0.0759
December 1918-February 19190.2179
December 1917-February 19180.0767
December 1916-February 1917-0.0360
December 1915-February 19160.1068
December 1914-February 19152.77127
December 1913-February 19140.1170
December 1912-February 19130.2179
December 1911-February 1912-0.5632
December 1910-February 1911-0.3845
December 1909-February 19101.14108
December 1908-February 19090.5090
December 1907-February 19081.78124
December 1906-February 19070.8897
December 1905-February 19060.1773
December 1904-February 19050.2280
December 1903-February 19040.1272
December 1902-February 19033.06128
December 1901-February 19023.07129
December 1900-February 1901-1.594
December 1899-February 19000.9198
December 1898-February 18991.76122
December 1897-February 18980.8296
December 1896-February 1897-0.5632
December 1895-February 18960.2075

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