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 7 Palmer Z-Index
December-February
Period
Z-Index
Rank
(out of 130)
December 2024-February 2025-0.3837
December 2023-February 20241.36115
December 2022-February 20230.4079
December 2021-February 20221.12110
December 2020-February 20210.1063
December 2019-February 20200.92102
December 2018-February 20191.76123
December 2017-February 20181.18112
December 2016-February 20170.6291
December 2015-February 20160.4983
December 2014-February 2015-0.8124
December 2013-February 20140.1264
December 2012-February 20130.81100
December 2011-February 20120.3070
December 2010-February 20110.7999
December 2009-February 20100.4882
December 2008-February 20090.3977
December 2007-February 20081.42118
December 2006-February 2007-0.1450
December 2005-February 2006-0.2940
December 2004-February 20051.77124
December 2003-February 20041.03105
December 2002-February 20030.3476
December 2001-February 2002-0.9218
December 2000-February 2001-1.506
December 1999-February 2000-0.4831
December 1998-February 1999-0.1153
December 1997-February 19980.6089
December 1996-February 19970.4180
December 1995-February 19961.08107
December 1994-February 1995-0.1351
December 1993-February 19940.6291
December 1992-February 19930.3374
December 1991-February 1992-1.0614
December 1990-February 19911.00104
December 1989-February 1990-0.4035
December 1988-February 1989-1.0614
December 1987-February 1988-0.3936
December 1986-February 1987-1.0116
December 1985-February 19860.0460
December 1984-February 1985-0.4831
December 1983-February 19841.20113
December 1982-February 1983-1.653
December 1981-February 19820.1767
December 1980-February 1981-0.2642
December 1979-February 1980-1.852
December 1978-February 19791.98128
December 1977-February 19781.48120
December 1976-February 1977-1.367
December 1975-February 19760.7296
December 1974-February 19751.45119
December 1973-February 19740.5686
December 1972-February 19730.7398
December 1971-February 19721.17111
December 1970-February 19711.42118
December 1969-February 19700.4581
December 1968-February 1969-0.9317
December 1967-February 1968-1.338
December 1966-February 1967-1.229
December 1965-February 1966-0.1745
December 1964-February 1965-0.0256
December 1963-February 1964-0.1648
December 1962-February 1963-1.229
December 1961-February 19620.0561
December 1960-February 1961-0.5727
December 1959-February 19600.6089
December 1958-February 1959-0.1252
December 1957-February 19580.3476
December 1956-February 19570.0359
December 1955-February 1956-0.3837
December 1954-February 1955-0.1054
December 1953-February 1954-1.0913
December 1952-February 1953-0.1844
December 1951-February 19521.96127
December 1950-February 19511.06106
December 1949-February 19501.39116
December 1948-February 19491.32114
December 1947-February 1948-0.5328
December 1946-February 1947-0.5328
December 1945-February 1946-0.8421
December 1944-February 19450.3273
December 1943-February 1944-1.614
December 1942-February 19430.82101
December 1941-February 1942-0.2642
December 1940-February 1941-0.8720
December 1939-February 1940-0.7725
December 1938-February 19390.5584
December 1937-February 19380.5787
December 1936-February 19371.79125
December 1935-February 19360.1466
December 1934-February 19350.1365
December 1933-February 1934-0.6626
December 1932-February 1933-1.1911
December 1931-February 19320.6794
December 1930-February 1931-2.781
December 1929-February 19300.0258
December 1928-February 1929-0.0555
December 1927-February 19280.93103
December 1926-February 19270.5686
December 1925-February 1926-0.1745
December 1924-February 1925-0.2940
December 1923-February 19241.54121
December 1922-February 19230.0762
December 1921-February 1922-0.9019
December 1920-February 1921-0.1549
December 1919-February 1920-0.4434
December 1918-February 1919-0.8322
December 1917-February 1918-0.1745
December 1916-February 1917-0.5328
December 1915-February 19160.7398
December 1914-February 19151.94126
December 1913-February 19140.6493
December 1912-February 19131.09108
December 1911-February 19120.0157
December 1910-February 19110.2169
December 1909-February 19101.73122
December 1908-February 19090.4079
December 1907-February 19082.01129
December 1906-February 19070.7296
December 1905-February 1906-0.3739
December 1904-February 1905-0.8322
December 1903-February 19040.3273
December 1902-February 19032.13130
December 1901-February 19021.10109
December 1900-February 1901-1.575
December 1899-February 19000.6493
December 1898-February 18990.1968
December 1897-February 18980.3273
December 1896-February 1897-1.1412
December 1895-February 1896-0.4831

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