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 1901 Palmer Z-Index Rankings

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Record Wettest
Period	Value	1901-2000 Mean	Anomaly	Rank (1895-2025)	Driest/Wettest Since	Record
December 1901 1-Month	-1.64	-0.20	-1.44	31st Driest	Driest since: 1898	2013
December 1901 1-Month	-1.64	-0.20	-1.44	100th Wettest	Wettest since: 1900	2015
Nov–Dec 1901 2-Month	-1.31	-0.04	-1.27	23rd Driest	Driest since: 1900	2013
Nov–Dec 1901 2-Month	-1.31	-0.04	-1.27	108th Wettest	Wettest since: 1899	1973
Oct–Dec 1901 3-Month	-1.56	-0.11	-1.45	10th Driest	Driest to Date	2013
Oct–Dec 1901 3-Month	-1.56	-0.11	-1.45	121st Wettest	Wettest since: 1900	2016
Sep–Dec 1901 4-Month	-0.05	-0.05	0.00	70th Driest	Driest since: 1898	1976
Sep–Dec 1901 4-Month	-0.05	-0.05	0.00	61st Wettest	Wettest since: 1900	1973
Aug–Dec 1901 5-Month	-0.16	-0.07	-0.09	70th Driest	Driest since: 1898	1936
Aug–Dec 1901 5-Month	-0.16	-0.07	-0.09	61st Wettest	Wettest since: 1900	1968
Jul–Dec 1901 6-Month	-0.23	-0.07	-0.16	62nd Driest	Driest since: 1895	2018
Jul–Dec 1901 6-Month	-0.23	-0.07	-0.16	69th Wettest	Wettest since: 1900	1920
Jun–Dec 1901 7-Month	-0.26	-0.06	-0.20	57th Driest	Driest since: 1895	2018
Jun–Dec 1901 7-Month	-0.26	-0.06	-0.20	74th Wettest	Wettest since: 1900	1920
May–Dec 1901 8-Month	-0.26	-0.05	-0.21	54th Driest	Driest to Date	2018
May–Dec 1901 8-Month	-0.26	-0.05	-0.21	77th Wettest	Wettest since: 1900	1968
Apr–Dec 1901 9-Month	0.01	-0.03	0.04	81st Driest	Driest since: 1898	1938
	0.01	-0.03	0.04	50th Wettest	Wettest since: 1900	1937
	Ties: 1897
Mar–Dec 1901 10-Month	-0.07	-0.05	-0.02	71st Driest	Driest since: 1898	1992
Mar–Dec 1901 10-Month	-0.07	-0.05	-0.02	60th Wettest	Wettest since: 1900	1920, 1937
Feb–Dec 1901 11-Month	-0.01	-0.04	0.03	74th Driest	Driest since: 1898	2018
Feb–Dec 1901 11-Month	-0.01	-0.04	0.03	57th Wettest	Wettest since: 1900	1983
Jan–Dec 1901 12-Month	0.06	-0.04	0.10	81st Driest	Driest since: 1900	1992
Jan–Dec 1901 12-Month	0.06	-0.04	0.10	50th Wettest	Wettest since: 1899	1983
Jul 1900–Dec 1901 18-Month	0.06	-0.04	0.10	80th Driest	Driest since: 1898	1992
Jul 1900–Dec 1901 18-Month	0.06	-0.04	0.10	50th Wettest	Wettest since: 1900	1983, 1996
Jan 1900–Dec 1901 24-Month	0.04	-0.04	0.08	76th Driest	Driest since: 1898	1930
Jan 1900–Dec 1901 24-Month	0.04	-0.04	0.08	54th Wettest	Wettest since: 1900	1984
Jan 1899–Dec 1901 36-Month	0.28	-0.03	0.31	107th Driest	Driest since: 1900	1930
Jan 1899–Dec 1901 36-Month	0.28	-0.03	0.31	22nd Wettest	Wettest since: 1897	1997
Jan 1898–Dec 1901 48-Month	0.07	-0.04	0.11	83rd Driest	Driest to Date	1926
Jan 1898–Dec 1901 48-Month	0.07	-0.04	0.11	45th Wettest	Wettest since: 1900	1998
Jan 1897–Dec 1901 60-Month	0.09	-0.04	0.13	90th Driest	Driest to Date	1926, 1932
Jan 1897–Dec 1901 60-Month	0.09	-0.04	0.13	37th Wettest	Wettest since: 1900	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 1901 Palmer Z-Index Rankings

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