Climate at a Glance | Divisional Rankings | National Centers for Environmental Information (NCEI)

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 1927 Palmer Z-Index Rankings

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Record Wettest
Period	Value	1901-2000 Mean	Anomaly	Rank (1895-2025)	Driest/Wettest Since	Record
December 1927 1-Month	-2.15	-0.20	-1.95	20th Driest	Driest since: 1921	2013
December 1927 1-Month	-2.15	-0.20	-1.95	111th Wettest	Wettest since: 1926	2015
Nov–Dec 1927 2-Month	-0.69	-0.04	-0.65	40th Driest	Driest since: 1923	2013
Nov–Dec 1927 2-Month	-0.69	-0.04	-0.65	91st Wettest	Wettest since: 1926	1973
Oct–Dec 1927 3-Month	-0.78	-0.11	-0.67	34th Driest	Driest since: 1925	2013
Oct–Dec 1927 3-Month	-0.78	-0.11	-0.67	97th Wettest	Wettest since: 1926	2016
Sep–Dec 1927 4-Month	0.39	-0.05	0.44	93rd Driest	Driest since: 1925	1976
Sep–Dec 1927 4-Month	0.39	-0.05	0.44	38th Wettest	Wettest since: 1926	1973
Aug–Dec 1927 5-Month	0.10	-0.07	0.17	84th Driest	Driest since: 1925	1936
Aug–Dec 1927 5-Month	0.10	-0.07	0.17	47th Wettest	Wettest since: 1926	1968
Jul–Dec 1927 6-Month	-0.02	-0.07	0.05	79th Driest	Driest since: 1925	2018
Jul–Dec 1927 6-Month	-0.02	-0.07	0.05	52nd Wettest	Wettest since: 1926	1920
Jun–Dec 1927 7-Month	-0.07	-0.06	-0.01	77th Driest	Driest since: 1926	2018
	-0.07	-0.06	-0.01	54th Wettest	Wettest since: 1921	1920
	Ties: 1915
May–Dec 1927 8-Month	0.04	-0.05	0.09	80th Driest	Driest since: 1925	2018
May–Dec 1927 8-Month	0.04	-0.05	0.09	51st Wettest	Wettest since: 1926	1968
Apr–Dec 1927 9-Month	-0.06	-0.03	-0.03	73rd Driest	Driest since: 1926	1938
Apr–Dec 1927 9-Month	-0.06	-0.03	-0.03	58th Wettest	Wettest since: 1921	1937
Mar–Dec 1927 10-Month	-0.22	-0.05	-0.17	59th Driest	Driest since: 1926	1992
Mar–Dec 1927 10-Month	-0.22	-0.05	-0.17	72nd Wettest	Wettest since: 1922	1920, 1937
Feb–Dec 1927 11-Month	0.08	-0.04	0.12	82nd Driest	Driest since: 1926	2018
Feb–Dec 1927 11-Month	0.08	-0.04	0.12	49th Wettest	Wettest since: 1920	1983
Jan–Dec 1927 12-Month	0.16	-0.04	0.20	88th Driest	Driest since: 1926	1992
Jan–Dec 1927 12-Month	0.16	-0.04	0.20	43rd Wettest	Wettest since: 1920	1983
Jul 1926–Dec 1927 18-Month	0.17	-0.04	0.21	86th Driest	Driest since: 1926	1992
Jul 1926–Dec 1927 18-Month	0.17	-0.04	0.21	44th Wettest	Wettest since: 1921	1983, 1996
Jan 1926–Dec 1927 24-Month	-0.20	-0.04	-0.16	52nd Driest	Driest since: 1926	1930
	-0.20	-0.04	-0.16	78th Wettest	Wettest since: 1922	1984
	Ties: 1898
Jan 1925–Dec 1927 36-Month	-0.35	-0.03	-0.32	33rd Driest	Driest since: 1926	1930
Jan 1925–Dec 1927 36-Month	-0.35	-0.03	-0.32	96th Wettest	Wettest since: 1923	1997
Jan 1924–Dec 1927 48-Month	-0.55	-0.04	-0.51	11th Driest	Driest since: 1926	1926
Jan 1924–Dec 1927 48-Month	-0.55	-0.04	-0.51	117th Wettest	Wettest since: 1924	1998
Jan 1923–Dec 1927 60-Month	-0.59	-0.04	-0.55	6th Driest	Driest since: 1926	1926, 1932
Jan 1923–Dec 1927 60-Month	-0.59	-0.04	-0.55	121st Wettest	Wettest since: 1925	1999

Citing This Page

NOAA National Centers for Environmental information, Climate at a Glance: Divisional Rankings, published March 2025, retrieved on March 28, 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 1927 Palmer Z-Index Rankings

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