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 2015 Palmer Z-Index Rankings

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Record Wettest
Period	Value	1901-2000 Mean	Anomaly	Rank (1895-2025)	Driest/Wettest Since	Record
December 2015 1-Month	4.65	-0.20	4.85	130th Driest	Driest since: 2014	2013
December 2015 1-Month	4.65	-0.20	4.85	1st Wettest	Wettest to Date	2015
Nov–Dec 2015 2-Month	2.63	-0.04	2.67	125th Driest	Driest since: 2014	2013
Nov–Dec 2015 2-Month	2.63	-0.04	2.67	6th Wettest	Wettest since: 2006	1973
Oct–Dec 2015 3-Month	1.34	-0.11	1.45	118th Driest	Driest since: 2014	2013
Oct–Dec 2015 3-Month	1.34	-0.11	1.45	13th Wettest	Wettest since: 2012	2016
Sep–Dec 2015 4-Month	0.64	-0.05	0.69	107th Driest	Driest since: 2014	1976
Sep–Dec 2015 4-Month	0.64	-0.05	0.69	24th Wettest	Wettest since: 1998	1973
Aug–Dec 2015 5-Month	0.28	-0.07	0.35	92nd Driest	Driest since: 2014	1936
Aug–Dec 2015 5-Month	0.28	-0.07	0.35	39th Wettest	Wettest since: 1997	1968
Jul–Dec 2015 6-Month	-0.34	-0.07	-0.27	50th Driest	Driest since: 2013	2018
Jul–Dec 2015 6-Month	-0.34	-0.07	-0.27	81st Wettest	Wettest since: 2014	1920
Jun–Dec 2015 7-Month	-0.70	-0.06	-0.64	28th Driest	Driest since: 2011	2018
Jun–Dec 2015 7-Month	-0.70	-0.06	-0.64	103rd Wettest	Wettest since: 2014	1920
May–Dec 2015 8-Month	-0.92	-0.05	-0.87	14th Driest	Driest since: 2008	2018
	-0.92	-0.05	-0.87	117th Wettest	Wettest since: 2014	1968
	Ties: 2008
Apr–Dec 2015 9-Month	-0.93	-0.03	-0.90	11th Driest	Driest since: 1992	1938
	-0.93	-0.03	-0.90	120th Wettest	Wettest since: 2014	1937
	Ties: 1930
Mar–Dec 2015 10-Month	-1.06	-0.05	-1.01	7th Driest	Driest since: 1992	1992
Mar–Dec 2015 10-Month	-1.06	-0.05	-1.01	124th Wettest	Wettest since: 2014	1920, 1937
Feb–Dec 2015 11-Month	-0.99	-0.04	-0.95	7th Driest	Driest since: 1992	2018
Feb–Dec 2015 11-Month	-0.99	-0.04	-0.95	124th Wettest	Wettest since: 2014	1983
Jan–Dec 2015 12-Month	-1.13	-0.04	-1.09	5th Driest	Driest since: 1992	1992
Jan–Dec 2015 12-Month	-1.13	-0.04	-1.09	126th Wettest	Wettest since: 2014	1983
Jul 2014–Dec 2015 18-Month	-0.81	-0.04	-0.77	10th Driest	Driest since: 1992	1992
Jul 2014–Dec 2015 18-Month	-0.81	-0.04	-0.77	120th Wettest	Wettest since: 2014	1983, 1996
Jan 2014–Dec 2015 24-Month	-0.61	-0.04	-0.57	18th Driest	Driest since: 2009	1930
Jan 2014–Dec 2015 24-Month	-0.61	-0.04	-0.57	112th Wettest	Wettest since: 2014	1984
Jan 2013–Dec 2015 36-Month	-0.72	-0.03	-0.69	7th Driest	Driest since: 1936	1930
Jan 2013–Dec 2015 36-Month	-0.72	-0.03	-0.69	122nd Wettest	Wettest since: 2014	1997
Jan 2012–Dec 2015 48-Month	-0.30	-0.04	-0.26	37th Driest	Driest since: 2010	1926
Jan 2012–Dec 2015 48-Month	-0.30	-0.04	-0.26	91st Wettest	Wettest since: 2014	1998
Jan 2011–Dec 2015 60-Month	-0.24	-0.04	-0.20	43rd Driest	Driest since: 2011	1926, 1932
Jan 2011–Dec 2015 60-Month	-0.24	-0.04	-0.20	84th Wettest	Wettest since: 2014	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 2015 Palmer Z-Index Rankings

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