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
Illinois, Climate Division 7 Palmer Z-Index
October-December
Period
Z-Index
Rank
(out of 130)
October-December 2024-1.0633
October-December 2023-1.929
October-December 2022-0.4049
October-December 20211.16106
October-December 20200.9193
October-December 20191.63114
October-December 20181.23107
October-December 2017-0.0563
October-December 2016-0.1260
October-December 20151.68115
October-December 20141.83118
October-December 20130.0965
October-December 20120.2670
October-December 20111.15105
October-December 2010-0.8939
October-December 20093.24130
October-December 20080.9798
October-December 2007-0.2952
October-December 20061.45112
October-December 2005-1.4517
October-December 20041.95119
October-December 20030.8790
October-December 2002-1.1329
October-December 20012.27123
October-December 20001.10103
October-December 1999-2.206
October-December 1998-0.5146
October-December 1997-1.1827
October-December 1996-0.2355
October-December 1995-1.2525
October-December 1994-0.8840
October-December 19932.10122
October-December 19921.0299
October-December 19910.5379
October-December 19903.06128
October-December 1989-1.1032
October-December 19880.4276
October-December 19870.3572
October-December 19860.6583
October-December 19852.35125
October-December 19841.54113
October-December 19833.11129
October-December 19822.31124
October-December 19810.4276
October-December 1980-1.6113
October-December 1979-0.1956
October-December 19780.3874
October-December 19770.9495
October-December 1976-1.2724
October-December 1975-0.2952
October-December 19740.1066
October-December 19731.07102
October-December 19721.38111
October-December 1971-0.9237
October-December 1970-0.7443
October-December 19691.35110
October-December 1968-0.3251
October-December 19672.67127
October-December 19660.5881
October-December 1965-1.0136
October-December 1964-2.048
October-December 1963-2.524
October-December 1962-1.3421
October-December 19610.2169
October-December 1960-1.3918
October-December 1959-0.2854
October-December 1958-0.1758
October-December 19572.05121
October-December 1956-1.3122
October-December 19550.3773
October-December 1954-1.1131
October-December 1953-3.331
October-December 1952-1.8411
October-December 19510.8991
October-December 19500.2971
October-December 19491.78117
October-December 19480.9596
October-December 1947-1.1926
October-December 19460.7386
October-December 19450.7386
October-December 1944-2.712
October-December 1943-1.5315
October-December 19420.5780
October-December 19411.76116
October-December 1940-1.2923
October-December 1939-1.9110
October-December 1938-1.1329
October-December 19371.14104
October-December 1936-0.4049
October-December 1935-0.7443
October-December 1934-0.1061
October-December 1933-2.177
October-December 19320.8089
October-December 19311.03101
October-December 1930-2.475
October-December 19290.8089
October-December 19280.4978
October-December 19271.96120
October-December 19261.30109
October-December 19250.1167
October-December 1924-0.8442
October-December 19230.9193
October-December 1922-1.0334
October-December 19210.4777
October-December 1920-1.4616
October-December 19192.48126
October-December 19181.03101
October-December 1917-0.5146
October-December 1916-1.3918
October-December 1915-0.0862
October-December 1914-1.8312
October-December 1913-0.1857
October-December 1912-1.0334
October-December 19110.9697
October-December 19100.9394
October-December 19090.7587
October-December 1908-2.593
October-December 19070.6382
October-December 19060.1368
October-December 19051.29108
October-December 1904-1.6113
October-December 1903-1.3820
October-December 1902-0.1459
October-December 1901-1.1628
October-December 1900-0.6945
October-December 1899-0.9038
October-December 18980.7084
October-December 1897-0.8541
October-December 1896-0.0264
October-December 1895-0.4548

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