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 1970 Palmer Z-Index Rankings

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Record Wettest
Period	Value	1901-2000 Mean	Anomaly	Rank (1895-2025)	Driest/Wettest Since	Record
December 1970 1-Month	2.02	-0.19	2.21	114th Driest	Driest since: 1969	1985
December 1970 1-Month	2.02	-0.19	2.21	17th Wettest	Wettest since: 1966	1933
Nov–Dec 1970 2-Month	0.84	-0.03	0.87	93rd Driest	Driest since: 1969	1976
Nov–Dec 1970 2-Month	0.84	-0.03	0.87	38th Wettest	Wettest since: 1966	1998
Oct–Dec 1970 3-Month	0.34	-0.04	0.38	76th Driest	Driest since: 1969	2013
Oct–Dec 1970 3-Month	0.34	-0.04	0.38	55th Wettest	Wettest since: 1968	1975
Sep–Dec 1970 4-Month	0.75	-0.03	0.78	105th Driest	Driest since: 1969	1976
	0.75	-0.03	0.78	26th Wettest	Wettest since: 1968	1933
	Ties: 1966
Aug–Dec 1970 5-Month	0.20	-0.05	0.25	78th Driest	Driest since: 1969	1929
Aug–Dec 1970 5-Month	0.20	-0.05	0.25	53rd Wettest	Wettest since: 1968	1975
Jul–Dec 1970 6-Month	0.05	-0.08	0.13	76th Driest	Driest since: 1969	1930
	0.05	-0.08	0.13	55th Wettest	Wettest since: 1968	1975
	Ties: 1915
Jun–Dec 1970 7-Month	-0.23	-0.06	-0.17	54th Driest	Driest since: 1969	1944
Jun–Dec 1970 7-Month	-0.23	-0.06	-0.17	77th Wettest	Wettest since: 1968	1997
May–Dec 1970 8-Month	-0.34	-0.04	-0.30	49th Driest	Driest since: 1969	2023
May–Dec 1970 8-Month	-0.34	-0.04	-0.30	82nd Wettest	Wettest since: 1968	1997
Apr–Dec 1970 9-Month	0.15	-0.04	0.19	83rd Driest	Driest since: 1969	1935
Apr–Dec 1970 9-Month	0.15	-0.04	0.19	48th Wettest	Wettest since: 1968	1997
Mar–Dec 1970 10-Month	-0.07	-0.05	-0.02	61st Driest	Driest since: 1969	1992
	-0.07	-0.05	-0.02	70th Wettest	Wettest since: 1968	1997
	Ties: 1946
Feb–Dec 1970 11-Month	-0.27	-0.06	-0.21	52nd Driest	Driest since: 1969	1992
Feb–Dec 1970 11-Month	-0.27	-0.06	-0.21	79th Wettest	Wettest since: 1968	1997
Jan–Dec 1970 12-Month	-0.22	-0.06	-0.16	50th Driest	Driest since: 1969	2019
Jan–Dec 1970 12-Month	-0.22	-0.06	-0.16	81st Wettest	Wettest since: 1968	1997
Jul 1969–Dec 1970 18-Month	-0.26	-0.06	-0.20	48th Driest	Driest since: 1965	2023
	-0.26	-0.06	-0.20	82nd Wettest	Wettest since: 1969	1997
	Ties: 1965
Jan 1969–Dec 1970 24-Month	-0.27	-0.05	-0.22	45th Driest	Driest since: 1966	1930
Jan 1969–Dec 1970 24-Month	-0.27	-0.05	-0.22	85th Wettest	Wettest since: 1969	1997
Jan 1968–Dec 1970 36-Month	0.20	-0.05	0.25	99th Driest	Driest since: 1969	1930
Jan 1968–Dec 1970 36-Month	0.20	-0.05	0.25	30th Wettest	Wettest since: 1968	1997
Jan 1967–Dec 1970 48-Month	0.07	-0.05	0.12	84th Driest	Driest since: 1968	1925
Jan 1967–Dec 1970 48-Month	0.07	-0.05	0.12	44th Wettest	Wettest since: 1969	1999
Jan 1966–Dec 1970 60-Month	0.05	-0.05	0.10	77th Driest	Driest since: 1969	1926
Jan 1966–Dec 1970 60-Month	0.05	-0.05	0.10	50th Wettest	Wettest since: 1968	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 1970 Palmer Z-Index Rankings

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