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 1900 Palmer Z-Index Rankings

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Record Wettest
Period	Value	1901-2000 Mean	Anomaly	Rank (1895-2025)	Driest/Wettest Since	Record
December 1900 1-Month	-0.99	-0.20	-0.79	47th Driest	Driest since: 1898	2013
December 1900 1-Month	-0.99	-0.20	-0.79	84th Wettest	Wettest since: 1899	2015
Nov–Dec 1900 2-Month	-1.37	-0.04	-1.33	21st Driest	Driest to Date	2013
Nov–Dec 1900 2-Month	-1.37	-0.04	-1.33	110th Wettest	Wettest since: 1899	1973
Oct–Dec 1900 3-Month	0.08	-0.11	0.19	79th Driest	Driest since: 1898	2013
Oct–Dec 1900 3-Month	0.08	-0.11	0.19	52nd Wettest	Wettest since: 1899	2016
Sep–Dec 1900 4-Month	0.21	-0.05	0.26	84th Driest	Driest since: 1898	1976
Sep–Dec 1900 4-Month	0.21	-0.05	0.26	47th Wettest	Wettest since: 1899	1973
Aug–Dec 1900 5-Month	0.11	-0.07	0.18	85th Driest	Driest since: 1898	1936
Aug–Dec 1900 5-Month	0.11	-0.07	0.18	46th Wettest	Wettest since: 1899	1968
Jul–Dec 1900 6-Month	0.08	-0.07	0.15	83rd Driest	Driest since: 1898	2018
Jul–Dec 1900 6-Month	0.08	-0.07	0.15	48th Wettest	Wettest since: 1899	1920
Jun–Dec 1900 7-Month	0.32	-0.06	0.38	96th Driest	Driest since: 1898	2018
Jun–Dec 1900 7-Month	0.32	-0.06	0.38	35th Wettest	Wettest since: 1899	1920
May–Dec 1900 8-Month	0.55	-0.05	0.60	105th Driest	Driest since: 1898	2018
May–Dec 1900 8-Month	0.55	-0.05	0.60	26th Wettest	Wettest since: 1899	1968
Apr–Dec 1900 9-Month	0.39	-0.03	0.42	93rd Driest	Driest since: 1898	1938
Apr–Dec 1900 9-Month	0.39	-0.03	0.42	38th Wettest	Wettest since: 1899	1937
Mar–Dec 1900 10-Month	0.25	-0.05	0.30	93rd Driest	Driest since: 1898	1992
Mar–Dec 1900 10-Month	0.25	-0.05	0.30	38th Wettest	Wettest since: 1899	1920, 1937
Feb–Dec 1900 11-Month	0.14	-0.04	0.18	85th Driest	Driest since: 1898	2018
Feb–Dec 1900 11-Month	0.14	-0.04	0.18	46th Wettest	Wettest since: 1899	1983
Jan–Dec 1900 12-Month	0.03	-0.04	0.07	78th Driest	Driest since: 1898	1992
Jan–Dec 1900 12-Month	0.03	-0.04	0.07	53rd Wettest	Wettest since: 1899	1983
Jul 1899–Dec 1900 18-Month	0.32	-0.04	0.36	99th Driest	Driest since: 1898	1992
Jul 1899–Dec 1900 18-Month	0.32	-0.04	0.36	31st Wettest	Wettest since: 1899	1983, 1996
Jan 1899–Dec 1900 24-Month	0.40	-0.04	0.44	109th Driest	Driest since: 1899	1930
Jan 1899–Dec 1900 24-Month	0.40	-0.04	0.44	21st Wettest	Wettest since: 1897	1984
Jan 1898–Dec 1900 36-Month	0.08	-0.03	0.11	84th Driest	Driest to Date	1930
Jan 1898–Dec 1900 36-Month	0.08	-0.03	0.11	45th Wettest	Wettest since: 1899	1997
Jan 1897–Dec 1900 48-Month	0.10	-0.04	0.14	86th Driest	Driest to Date	1926
Jan 1897–Dec 1900 48-Month	0.10	-0.04	0.14	42nd Wettest	Wettest since: 1899	1998
Jan 1896–Dec 1900 60-Month	0.30	-0.04	0.34	113th Driest	Driest since: 1899	1926, 1932
Jan 1896–Dec 1900 60-Month	0.30	-0.04	0.34	14th 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 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 1900 Palmer Z-Index Rankings

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