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Divisional Rankings

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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.

Oregon, Climate Division 1

December 1984 Palmer Z-Index Rankings

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Record Wettest
Period	Value	1901-2000 Mean	Anomaly	Rank (1895-2025)	Driest/Wettest Since	Record
December 1984 1-Month	-1.81	-0.20	-1.61	28th Driest	Driest since: 1978	2013
December 1984 1-Month	-1.81	-0.20	-1.61	103rd Wettest	Wettest since: 1983	2015
Nov–Dec 1984 2-Month	0.60	-0.04	0.64	91st Driest	Driest since: 1982	2013
Nov–Dec 1984 2-Month	0.60	-0.04	0.64	40th Wettest	Wettest since: 1983	1973
Oct–Dec 1984 3-Month	1.03	-0.11	1.14	111th Driest	Driest since: 1983	2013
Oct–Dec 1984 3-Month	1.03	-0.11	1.14	20th Wettest	Wettest since: 1981	2016
Sep–Dec 1984 4-Month	0.61	-0.05	0.66	105th Driest	Driest since: 1983	1976
	0.61	-0.05	0.66	26th Wettest	Wettest since: 1982	1973
	Ties: 1970, 1982
Aug–Dec 1984 5-Month	0.31	-0.07	0.38	96th Driest	Driest since: 1982	1936
	0.31	-0.07	0.38	35th Wettest	Wettest since: 1983	1968
	Ties: 1982
Jul–Dec 1984 6-Month	0.24	-0.07	0.31	99th Driest	Driest since: 1982	2018
	0.24	-0.07	0.31	32nd Wettest	Wettest since: 1983	1920
	Ties: 1963
Jun–Dec 1984 7-Month	0.60	-0.06	0.66	109th Driest	Driest since: 1982	2018
Jun–Dec 1984 7-Month	0.60	-0.06	0.66	22nd Wettest	Wettest since: 1983	1920
May–Dec 1984 8-Month	0.84	-0.05	0.89	113th Driest	Driest since: 1982	2018
	0.84	-0.05	0.89	18th Wettest	Wettest since: 1983	1968
	Ties: 1899
Apr–Dec 1984 9-Month	0.92	-0.03	0.95	115th Driest	Driest since: 1982	1938
Apr–Dec 1984 9-Month	0.92	-0.03	0.95	16th Wettest	Wettest since: 1983	1937
Mar–Dec 1984 10-Month	0.77	-0.05	0.82	111th Driest	Driest since: 1982	1992
Mar–Dec 1984 10-Month	0.77	-0.05	0.82	20th Wettest	Wettest since: 1983	1920, 1937
Feb–Dec 1984 11-Month	0.79	-0.04	0.83	116th Driest	Driest since: 1982	2018
	0.79	-0.04	0.83	15th Wettest	Wettest since: 1983	1983
	Ties: 1953
Jan–Dec 1984 12-Month	0.51	-0.04	0.55	107th Driest	Driest since: 1982	1992
Jan–Dec 1984 12-Month	0.51	-0.04	0.55	24th Wettest	Wettest since: 1983	1983
Jul 1983–Dec 1984 18-Month	0.83	-0.04	0.87	126th Driest	Driest since: 1982	1992
Jul 1983–Dec 1984 18-Month	0.83	-0.04	0.87	4th Wettest	Wettest since: 1983	1983, 1996
Jan 1983–Dec 1984 24-Month	0.99	-0.04	1.03	129th Driest	Driest since: 1983	1930
Jan 1983–Dec 1984 24-Month	0.99	-0.04	1.03	1st Wettest	Wettest to Date	1984
Jan 1982–Dec 1984 36-Month	0.78	-0.03	0.81	127th Driest	Driest since: 1983	1930
Jan 1982–Dec 1984 36-Month	0.78	-0.03	0.81	2nd Wettest	Wettest to Date	1997
Jan 1981–Dec 1984 48-Month	0.68	-0.04	0.72	126th Driest	Driest since: 1983	1926
Jan 1981–Dec 1984 48-Month	0.68	-0.04	0.72	2nd Wettest	Wettest to Date	1998
Jan 1980–Dec 1984 60-Month	0.49	-0.04	0.53	125th Driest	Driest since: 1983	1926, 1932
Jan 1980–Dec 1984 60-Month	0.49	-0.04	0.53	2nd Wettest	Wettest to Date	1999

Citing This Page

NOAA National Centers for Environmental information, Climate at a Glance: Divisional Rankings, published March 2025, retrieved on March 26, 2025 from https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/divisional/rankings

Climate at a Glance Divisional Rankings

Divisional Rankings

Oregon, Climate Division 1

December 1984 Palmer Z-Index Rankings

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