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
Montana, Climate Division 4 Palmer Z-IndexOctober-December18952024190519151925193519451955196519751985199520052015-3.004.00-2.00-1.000.001.002.003.00-3.004.00-2.00-1.000.001.002.003.00ZingChart
Montana, Climate Division 4 Palmer Z-Index
October-December
Period
Z-Index
Rank
(out of 130)
October-December 2024-1.665
October-December 2023-0.7529
October-December 20220.5489
October-December 2021-1.5310
October-December 20200.2675
October-December 20191.25114
October-December 20180.0456
October-December 20170.5690
October-December 20160.7796
October-December 20150.1364
October-December 20140.1766
October-December 2013-0.1947
October-December 20120.1867
October-December 20110.2170
October-December 20101.08107
October-December 20091.13111
October-December 20080.2069
October-December 2007-0.6331
October-December 20060.92101
October-December 20050.6091
October-December 2004-1.1217
October-December 2003-0.3835
October-December 2002-0.9821
October-December 2001-1.923
October-December 2000-0.4832
October-December 1999-1.5111
October-December 19980.1968
October-December 1997-0.3042
October-December 19960.8298
October-December 19950.7094
October-December 19940.3678
October-December 19931.44118
October-December 1992-0.2844
October-December 1991-0.1449
October-December 1990-0.9622
October-December 19891.11110
October-December 1988-1.0918
October-December 1987-2.012
October-December 1986-0.0651
October-December 19850.88100
October-December 19840.1261
October-December 19830.1465
October-December 19820.2472
October-December 1981-0.1150
October-December 19800.1261
October-December 1979-1.3414
October-December 19781.14112
October-December 19771.04103
October-December 1976-0.9024
October-December 19752.97128
October-December 1974-0.8227
October-December 19730.5188
October-December 1972-0.2745
October-December 1971-0.1648
October-December 1970-0.2546
October-December 19690.2573
October-December 19680.2675
October-December 19671.34116
October-December 19660.5188
October-December 1965-0.3042
October-December 19640.4079
October-December 1963-0.8625
October-December 19620.3377
October-December 1961-0.3438
October-December 1960-1.626
October-December 19591.33115
October-December 19580.95102
October-December 19570.6393
October-December 1956-1.0519
October-December 19551.06105
October-December 1954-1.569
October-December 1953-1.834
October-December 1952-1.2515
October-December 19512.06126
October-December 19500.7195
October-December 1949-0.4633
October-December 1948-0.3241
October-December 1947-0.0452
October-December 19463.48130
October-December 19450.0759
October-December 1944-0.9920
October-December 1943-0.8326
October-December 19420.4786
October-December 19411.73124
October-December 1940-0.4034
October-December 1939-0.7330
October-December 19381.09109
October-December 19370.0053
October-December 1936-1.4712
October-December 1935-1.4013
October-December 1934-1.578
October-December 19330.4280
October-December 19320.8197
October-December 1931-1.2016
October-December 19300.6292
October-December 19291.56121
October-December 1928-0.3438
October-December 19272.28127
October-December 19260.0154
October-December 19251.69123
October-December 19240.1060
October-December 19230.4485
October-December 19220.0557
October-December 19210.4382
October-December 1920-0.9123
October-December 19191.47119
October-December 1918-0.3835
October-December 19170.0658
October-December 19161.83125
October-December 19150.4485
October-December 19140.0154
October-December 19131.08107
October-December 19120.4485
October-December 19111.52120
October-December 19100.1261
October-December 19091.25114
October-December 19080.2371
October-December 1907-1.617
October-December 19061.37117
October-December 1905-0.8128
October-December 1904-2.341
October-December 19030.4382
October-December 19020.8399
October-December 1901-0.3637
October-December 1900-0.3340
October-December 18991.09109
October-December 18981.68122
October-December 18973.44129
October-December 18961.05104
October-December 18950.3377

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