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.

Iowa, Climate Division 4

December 1989 Palmer Z-Index Rankings

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Record Wettest
Period	Value	1901-2000 Mean	Anomaly	Rank (1895-2025)	Driest/Wettest Since	Record
December 1989 1-Month	-1.01	0.05	-1.06	22nd Driest	Driest since: 1980	1976
	-1.01	0.05	-1.06	109th Wettest	Wettest since: 1988	2015
	Ties: 1967
Nov–Dec 1989 2-Month	-1.19	0.10	-1.29	20th Driest	Driest since: 1980	1976
Nov–Dec 1989 2-Month	-1.19	0.10	-1.29	111th Wettest	Wettest since: 1988	2015
Oct–Dec 1989 3-Month	-0.95	0.11	-1.06	25th Driest	Driest since: 1980	1955
Oct–Dec 1989 3-Month	-0.95	0.11	-1.06	106th Wettest	Wettest since: 1988	2015
Sep–Dec 1989 4-Month	-0.06	0.14	-0.20	65th Driest	Driest since: 1988	1939
Sep–Dec 1989 4-Month	-0.06	0.14	-0.20	66th Wettest	Wettest since: 1987	2015
Aug–Dec 1989 5-Month	-0.34	0.12	-0.46	48th Driest	Driest since: 1981	1976
Aug–Dec 1989 5-Month	-0.34	0.12	-0.46	83rd Wettest	Wettest since: 1988	2015
Jul–Dec 1989 6-Month	-0.33	0.13	-0.46	48th Driest	Driest since: 1981	1976
Jul–Dec 1989 6-Month	-0.33	0.13	-0.46	83rd Wettest	Wettest since: 1988	2015
Jun–Dec 1989 7-Month	-0.30	0.13	-0.43	48th Driest	Driest since: 1988	1976
	-0.30	0.13	-0.43	83rd Wettest	Wettest since: 1987	2015
	Ties: 1971
May–Dec 1989 8-Month	-0.48	0.13	-0.61	36th Driest	Driest since: 1988	1936
	-0.48	0.13	-0.61	95th Wettest	Wettest since: 1987	2015
	Ties: 1974
Apr–Dec 1989 9-Month	-0.68	0.13	-0.81	26th Driest	Driest since: 1988	1934
	-0.68	0.13	-0.81	105th Wettest	Wettest since: 1987	2015
	Ties: 1963
Mar–Dec 1989 10-Month	-0.77	0.10	-0.87	23rd Driest	Driest since: 1988	1934
Mar–Dec 1989 10-Month	-0.77	0.10	-0.87	108th Wettest	Wettest since: 1987	2015
Feb–Dec 1989 11-Month	-0.77	0.11	-0.88	20th Driest	Driest since: 1988	1934
Feb–Dec 1989 11-Month	-0.77	0.11	-0.88	111th Wettest	Wettest since: 1987	2015
Jan–Dec 1989 12-Month	-0.69	0.11	-0.80	21st Driest	Driest since: 1988	1934
Jan–Dec 1989 12-Month	-0.69	0.11	-0.80	110th Wettest	Wettest since: 1987	2015
Jul 1988–Dec 1989 18-Month	-0.56	0.13	-0.69	27th Driest	Driest since: 1981	1956
Jul 1988–Dec 1989 18-Month	-0.56	0.13	-0.69	103rd Wettest	Wettest since: 1988	2015
Jan 1988–Dec 1989 24-Month	-0.81	0.12	-0.93	11th Driest	Driest since: 1981	1934
Jan 1988–Dec 1989 24-Month	-0.81	0.12	-0.93	119th Wettest	Wettest since: 1988	2015
Jan 1987–Dec 1989 36-Month	-0.34	0.12	-0.46	29th Driest	Driest since: 1981	1936
Jan 1987–Dec 1989 36-Month	-0.34	0.12	-0.46	100th Wettest	Wettest since: 1988	2009
Jan 1986–Dec 1989 48-Month	0.12	0.12	0.00	63rd Driest	Driest since: 1983	1936
	0.12	0.12	0.00	65th Wettest	Wettest since: 1988	2010
	Ties: 1924
Jan 1985–Dec 1989 60-Month	0.05	0.11	-0.06	45th Driest	Driest since: 1981	1937
Jan 1985–Dec 1989 60-Month	0.05	0.11	-0.06	82nd Wettest	Wettest since: 1988	2018

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

Iowa, Climate Division 4

December 1989 Palmer Z-Index Rankings

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