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 1940 Palmer Z-Index Rankings

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Record Wettest
Period	Value	1901-2000 Mean	Anomaly	Rank (1895-2025)	Driest/Wettest Since	Record
December 1940 1-Month	-1.10	-0.19	-0.91	41st Driest	Driest since: 1935	1985
December 1940 1-Month	-1.10	-0.19	-0.91	90th Wettest	Wettest since: 1939	1933
Nov–Dec 1940 2-Month	-1.34	-0.03	-1.31	19th Driest	Driest since: 1935	1976
Nov–Dec 1940 2-Month	-1.34	-0.03	-1.31	112th Wettest	Wettest since: 1939	1998
Oct–Dec 1940 3-Month	-0.11	-0.04	-0.07	60th Driest	Driest since: 1938	2013
Oct–Dec 1940 3-Month	-0.11	-0.04	-0.07	71st Wettest	Wettest since: 1939	1975
Sep–Dec 1940 4-Month	-0.41	-0.03	-0.38	43rd Driest	Driest since: 1938	1976
Sep–Dec 1940 4-Month	-0.41	-0.03	-0.38	88th Wettest	Wettest since: 1939	1933
Aug–Dec 1940 5-Month	-0.51	-0.05	-0.46	36th Driest	Driest since: 1938	1929
Aug–Dec 1940 5-Month	-0.51	-0.05	-0.46	95th Wettest	Wettest since: 1939	1975
Jul–Dec 1940 6-Month	-0.37	-0.08	-0.29	47th Driest	Driest since: 1938	1930
Jul–Dec 1940 6-Month	-0.37	-0.08	-0.29	84th Wettest	Wettest since: 1939	1975
Jun–Dec 1940 7-Month	-0.68	-0.06	-0.62	37th Driest	Driest since: 1938	1944
Jun–Dec 1940 7-Month	-0.68	-0.06	-0.62	94th Wettest	Wettest since: 1939	1997
May–Dec 1940 8-Month	-0.61	-0.04	-0.57	30th Driest	Driest since: 1938	2023
May–Dec 1940 8-Month	-0.61	-0.04	-0.57	101st Wettest	Wettest since: 1939	1997
Apr–Dec 1940 9-Month	-0.58	-0.04	-0.54	26th Driest	Driest since: 1938	1935
Apr–Dec 1940 9-Month	-0.58	-0.04	-0.54	105th Wettest	Wettest since: 1939	1997
Mar–Dec 1940 10-Month	-0.50	-0.05	-0.45	31st Driest	Driest since: 1938	1992
Mar–Dec 1940 10-Month	-0.50	-0.05	-0.45	100th Wettest	Wettest since: 1939	1997
Feb–Dec 1940 11-Month	-0.23	-0.06	-0.17	56th Driest	Driest since: 1939	1992
Feb–Dec 1940 11-Month	-0.23	-0.06	-0.17	75th Wettest	Wettest since: 1937	1997
Jan–Dec 1940 12-Month	-0.31	-0.06	-0.25	44th Driest	Driest since: 1939	2019
	-0.31	-0.06	-0.25	87th Wettest	Wettest since: 1937	1997
	Ties: 1918
Jul 1939–Dec 1940 18-Month	-0.22	-0.06	-0.16	55th Driest	Driest since: 1939	2023
Jul 1939–Dec 1940 18-Month	-0.22	-0.06	-0.16	75th Wettest	Wettest since: 1937	1997
Jan 1939–Dec 1940 24-Month	-0.33	-0.05	-0.28	39th Driest	Driest since: 1939	1930
	-0.33	-0.05	-0.28	91st Wettest	Wettest since: 1938	1997
	Ties: 1919
Jan 1938–Dec 1940 36-Month	-0.57	-0.05	-0.52	11th Driest	Driest since: 1930	1930
Jan 1938–Dec 1940 36-Month	-0.57	-0.05	-0.52	118th Wettest	Wettest since: 1939	1997
Jan 1937–Dec 1940 48-Month	-0.21	-0.05	-0.16	43rd Driest	Driest since: 1938	1925
Jan 1937–Dec 1940 48-Month	-0.21	-0.05	-0.16	85th Wettest	Wettest since: 1939	1999
Jan 1936–Dec 1940 60-Month	-0.21	-0.05	-0.16	45th Driest	Driest since: 1939	1926
	-0.21	-0.05	-0.16	82nd Wettest	Wettest since: 1937	1903
	Ties: 1923

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 1940 Palmer Z-Index Rankings

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