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 2 Palmer Z-Index
October-December
Period
Z-Index
Rank
(out of 130)
October-December 2024-1.4324
October-December 2023-0.1054
October-December 2022-0.9339
October-December 20210.4076
October-December 2020-0.6144
October-December 20191.78120
October-December 20181.69116
October-December 20171.60115
October-December 20160.2367
October-December 20151.90121
October-December 20140.4378
October-December 2013-0.0956
October-December 2012-1.3927
October-December 20110.8093
October-December 2010-0.9537
October-December 20092.58128
October-December 20081.58114
October-December 2007-0.0358
October-December 20061.99123
October-December 2005-2.755
October-December 20040.3070
October-December 20030.8093
October-December 2002-1.9215
October-December 20011.30106
October-December 20000.3873
October-December 1999-2.0613
October-December 19980.4076
October-December 1997-1.0232
October-December 1996-0.1054
October-December 19950.5281
October-December 19940.6284
October-December 19930.2468
October-December 19921.37107
October-December 19912.31124
October-December 19902.56126
October-December 1989-0.4648
October-December 19880.3873
October-December 19871.56112
October-December 19860.7088
October-December 19852.91130
October-December 19840.7088
October-December 19831.44108
October-December 19822.84129
October-December 1981-0.1353
October-December 19800.5482
October-December 19790.2869
October-December 19780.7088
October-December 19770.9399
October-December 1976-2.1112
October-December 1975-0.4449
October-December 1974-0.7043
October-December 19730.7490
October-December 19721.76119
October-December 1971-1.0133
October-December 19700.7791
October-December 19691.05102
October-December 19680.2266
October-December 19671.74118
October-December 19660.0162
October-December 19650.8595
October-December 1964-1.8516
October-December 1963-3.072
October-December 1962-2.666
October-December 19611.16103
October-December 1960-1.3729
October-December 19591.53110
October-December 1958-1.0034
October-December 19570.97100
October-December 1956-3.101
October-December 1955-0.1652
October-December 19542.35125
October-December 1953-2.378
October-December 1952-0.9636
October-December 19511.72117
October-December 1950-1.1930
October-December 1949-0.3750
October-December 1948-1.3927
October-December 1947-0.9041
October-December 1946-0.9339
October-December 19450.4579
October-December 1944-2.883
October-December 1943-1.8516
October-December 19420.9097
October-December 19412.58128
October-December 1940-0.7642
October-December 1939-1.8320
October-December 1938-0.9438
October-December 1937-1.4523
October-December 19360.9399
October-December 19350.3171
October-December 1934-0.0358
October-December 1933-1.8022
October-December 19320.6485
October-December 19311.46109
October-December 1930-1.4026
October-December 1929-0.2551
October-December 19281.91122
October-December 19271.58114
October-December 19261.24104
October-December 19250.0763
October-December 1924-0.9835
October-December 19230.8796
October-December 1922-1.8221
October-December 19211.28105
October-December 1920-2.1811
October-December 19190.6083
October-December 1918-0.0956
October-December 1917-0.4847
October-December 19160.3974
October-December 1915-0.5145
October-December 1914-1.8419
October-December 1913-1.4225
October-December 19120.5080
October-December 19111.55111
October-December 1910-2.517
October-December 19090.7389
October-December 1908-2.219
October-December 1907-0.0160
October-December 19060.0061
October-December 19050.4177
October-December 1904-1.8516
October-December 19030.0864
October-December 19020.8494
October-December 1901-2.794
October-December 1900-1.0731
October-December 1899-1.9714
October-December 18981.00101
October-December 1897-2.219
October-December 1896-0.5046
October-December 18950.1865

Citing This Page