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 1929 Palmer Z-Index Rankings

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Record Wettest
Period	Value	1901-2000 Mean	Anomaly	Rank (1895-2025)	Driest/Wettest Since	Record
December 1929 1-Month	-0.88	-0.19	-0.69	47th Driest	Driest since: 1928	1985
December 1929 1-Month	-0.88	-0.19	-0.69	84th Wettest	Wettest since: 1925	1933
Nov–Dec 1929 2-Month	-1.89	-0.03	-1.86	11th Driest	Driest to Date	1976
Nov–Dec 1929 2-Month	-1.89	-0.03	-1.86	120th Wettest	Wettest since: 1928	1998
Oct–Dec 1929 3-Month	-1.81	-0.04	-1.77	8th Driest	Driest to Date	2013
Oct–Dec 1929 3-Month	-1.81	-0.04	-1.77	123rd Wettest	Wettest since: 1928	1975
Sep–Dec 1929 4-Month	-2.07	-0.03	-2.04	2nd Driest	Driest to Date	1976
Sep–Dec 1929 4-Month	-2.07	-0.03	-2.04	129th Wettest	Wettest since: 1928	1933
Aug–Dec 1929 5-Month	-1.80	-0.05	-1.75	1st Driest	Driest to Date	1929
Aug–Dec 1929 5-Month	-1.80	-0.05	-1.75	130th Wettest	Wettest since: 1928	1975
Jul–Dec 1929 6-Month	-1.54	-0.08	-1.46	2nd Driest	Driest to Date	1930
Jul–Dec 1929 6-Month	-1.54	-0.08	-1.46	129th Wettest	Wettest since: 1928	1975
Jun–Dec 1929 7-Month	-1.02	-0.06	-0.96	12th Driest	Driest since: 1928	1944
Jun–Dec 1929 7-Month	-1.02	-0.06	-0.96	119th Wettest	Wettest since: 1927	1997
May–Dec 1929 8-Month	-0.98	-0.04	-0.94	11th Driest	Driest since: 1928	2023
May–Dec 1929 8-Month	-0.98	-0.04	-0.94	120th Wettest	Wettest since: 1927	1997
Apr–Dec 1929 9-Month	-0.72	-0.04	-0.68	20th Driest	Driest since: 1928	1935
Apr–Dec 1929 9-Month	-0.72	-0.04	-0.68	111th Wettest	Wettest since: 1927	1997
Mar–Dec 1929 10-Month	-0.68	-0.05	-0.63	23rd Driest	Driest since: 1926	1992
Mar–Dec 1929 10-Month	-0.68	-0.05	-0.63	108th Wettest	Wettest since: 1928	1997
Feb–Dec 1929 11-Month	-0.91	-0.06	-0.85	12th Driest	Driest since: 1925	1992
Feb–Dec 1929 11-Month	-0.91	-0.06	-0.85	119th Wettest	Wettest since: 1928	1997
Jan–Dec 1929 12-Month	-1.02	-0.06	-0.96	7th Driest	Driest to Date	2019
Jan–Dec 1929 12-Month	-1.02	-0.06	-0.96	124th Wettest	Wettest since: 1928	1997
Jul 1928–Dec 1929 18-Month	-1.13	-0.06	-1.07	4th Driest	Driest to Date	2023
Jul 1928–Dec 1929 18-Month	-1.13	-0.06	-1.07	126th Wettest	Wettest since: 1928	1997
Jan 1928–Dec 1929 24-Month	-0.91	-0.05	-0.86	5th Driest	Driest since: 1923	1930
Jan 1928–Dec 1929 24-Month	-0.91	-0.05	-0.86	125th Wettest	Wettest since: 1928	1997
Jan 1927–Dec 1929 36-Month	-0.59	-0.05	-0.54	9th Driest	Driest since: 1926	1930
Jan 1927–Dec 1929 36-Month	-0.59	-0.05	-0.54	120th Wettest	Wettest since: 1928	1997
Jan 1926–Dec 1929 48-Month	-0.64	-0.05	-0.59	6th Driest	Driest since: 1926	1925
Jan 1926–Dec 1929 48-Month	-0.64	-0.05	-0.59	122nd Wettest	Wettest since: 1928	1999
Jan 1925–Dec 1929 60-Month	-0.66	-0.05	-0.61	4th Driest	Driest since: 1926	1926
Jan 1925–Dec 1929 60-Month	-0.66	-0.05	-0.61	123rd Wettest	Wettest since: 1928	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 1929 Palmer Z-Index Rankings

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