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.

Washington, 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	1.82	-0.19	2.01	113th Driest	Driest since: 1899	1985
December 1900 1-Month	1.82	-0.19	2.01	18th Wettest	Wettest since: 1897	1933
Nov–Dec 1900 2-Month	0.38	-0.03	0.41	75th Driest	Driest since: 1898	1976
Nov–Dec 1900 2-Month	0.38	-0.03	0.41	56th Wettest	Wettest since: 1899	1998
Oct–Dec 1900 3-Month	0.90	-0.04	0.94	102nd Driest	Driest since: 1898	2013
Oct–Dec 1900 3-Month	0.90	-0.04	0.94	29th Wettest	Wettest since: 1899	1975
Sep–Dec 1900 4-Month	0.47	-0.03	0.50	89th Driest	Driest since: 1898	1976
Sep–Dec 1900 4-Month	0.47	-0.03	0.50	42nd Wettest	Wettest since: 1899	1933
Aug–Dec 1900 5-Month	0.58	-0.05	0.63	107th Driest	Driest since: 1898	1929
Aug–Dec 1900 5-Month	0.58	-0.05	0.63	24th Wettest	Wettest since: 1899	1975
Jul–Dec 1900 6-Month	0.51	-0.08	0.59	102nd Driest	Driest since: 1898	1930
Jul–Dec 1900 6-Month	0.51	-0.08	0.59	29th Wettest	Wettest since: 1899	1975
Jun–Dec 1900 7-Month	1.24	-0.06	1.30	124th Driest	Driest since: 1899	1944
Jun–Dec 1900 7-Month	1.24	-0.06	1.30	7th Wettest	Wettest to Date	1997
May–Dec 1900 8-Month	1.34	-0.04	1.38	127th Driest	Driest since: 1899	2023
May–Dec 1900 8-Month	1.34	-0.04	1.38	4th Wettest	Wettest to Date	1997
Apr–Dec 1900 9-Month	1.06	-0.04	1.10	124th Driest	Driest since: 1898	1935
Apr–Dec 1900 9-Month	1.06	-0.04	1.10	7th Wettest	Wettest since: 1899	1997
Mar–Dec 1900 10-Month	1.07	-0.05	1.12	126th Driest	Driest since: 1899	1992
Mar–Dec 1900 10-Month	1.07	-0.05	1.12	5th Wettest	Wettest to Date	1997
Feb–Dec 1900 11-Month	0.98	-0.06	1.04	126th Driest	Driest since: 1899	1992
Feb–Dec 1900 11-Month	0.98	-0.06	1.04	5th Wettest	Wettest to Date	1997
Jan–Dec 1900 12-Month	0.86	-0.06	0.92	124th Driest	Driest since: 1898	2019
Jan–Dec 1900 12-Month	0.86	-0.06	0.92	7th Wettest	Wettest since: 1899	1997
Jul 1899–Dec 1900 18-Month	0.78	-0.06	0.84	126th Driest	Driest since: 1899	2023
Jul 1899–Dec 1900 18-Month	0.78	-0.06	0.84	4th Wettest	Wettest to Date	1997
Jan 1899–Dec 1900 24-Month	0.92	-0.05	0.97	128th Driest	Driest since: 1899	1930
Jan 1899–Dec 1900 24-Month	0.92	-0.05	0.97	2nd Wettest	Wettest to Date	1997
Jan 1898–Dec 1900 36-Month	0.60	-0.05	0.65	123rd Driest	Driest since: 1899	1930
Jan 1898–Dec 1900 36-Month	0.60	-0.05	0.65	6th Wettest	Wettest to Date	1997
Jan 1897–Dec 1900 48-Month	0.50	-0.05	0.55	123rd Driest	Driest since: 1899	1925
Jan 1897–Dec 1900 48-Month	0.50	-0.05	0.55	5th Wettest	Wettest to Date	1999
Jan 1896–Dec 1900 60-Month	0.50	-0.05	0.55	123rd Driest	Driest since: 1899	1926
Jan 1896–Dec 1900 60-Month	0.50	-0.05	0.55	4th Wettest	Wettest to Date	1903

Citing This Page

NOAA National Centers for Environmental information, Climate at a Glance: Divisional Rankings, published March 2025, retrieved on March 31, 2025 from https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/divisional/rankings

Climate at a Glance Divisional Rankings

Divisional Rankings

Washington, Climate Division 1

December 1900 Palmer Z-Index Rankings

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