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 1991 Palmer Z-Index Rankings

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Record Wettest
Period	Value	1901-2000 Mean	Anomaly	Rank (1895-2025)	Driest/Wettest Since	Record
December 1991 1-Month	1.33	0.05	1.28	110th Driest	Driest since: 1990	1976
December 1991 1-Month	1.33	0.05	1.28	21st Wettest	Wettest since: 1984	2015
Nov–Dec 1991 2-Month	2.15	0.10	2.05	122nd Driest	Driest since: 1990	1976
Nov–Dec 1991 2-Month	2.15	0.10	2.05	9th Wettest	Wettest since: 1984	2015
Oct–Dec 1991 3-Month	1.47	0.11	1.36	107th Driest	Driest since: 1990	1955
Oct–Dec 1991 3-Month	1.47	0.11	1.36	24th Wettest	Wettest since: 1986	2015
Sep–Dec 1991 4-Month	0.93	0.14	0.79	95th Driest	Driest since: 1990	1939
Sep–Dec 1991 4-Month	0.93	0.14	0.79	36th Wettest	Wettest since: 1986	2015
Aug–Dec 1991 5-Month	0.58	0.12	0.46	85th Driest	Driest since: 1990	1976
Aug–Dec 1991 5-Month	0.58	0.12	0.46	46th Wettest	Wettest since: 1987	2015
Jul–Dec 1991 6-Month	0.25	0.13	0.12	71st Driest	Driest since: 1990	1976
Jul–Dec 1991 6-Month	0.25	0.13	0.12	60th Wettest	Wettest since: 1987	2015
Jun–Dec 1991 7-Month	0.33	0.13	0.20	75th Driest	Driest since: 1989	1976
Jun–Dec 1991 7-Month	0.33	0.13	0.20	56th Wettest	Wettest since: 1990	2015
May–Dec 1991 8-Month	0.38	0.13	0.25	75th Driest	Driest since: 1989	1936
May–Dec 1991 8-Month	0.38	0.13	0.25	56th Wettest	Wettest since: 1990	2015
Apr–Dec 1991 9-Month	0.76	0.13	0.63	96th Driest	Driest since: 1990	1934
	0.76	0.13	0.63	35th Wettest	Wettest since: 1986	2015
	Ties: 1923
Mar–Dec 1991 10-Month	0.97	0.10	0.87	102nd Driest	Driest since: 1990	1934
Mar–Dec 1991 10-Month	0.97	0.10	0.87	29th Wettest	Wettest since: 1986	2015
Feb–Dec 1991 11-Month	0.80	0.11	0.69	99th Driest	Driest since: 1990	1934
Feb–Dec 1991 11-Month	0.80	0.11	0.69	32nd Wettest	Wettest since: 1986	2015
Jan–Dec 1991 12-Month	0.73	0.11	0.62	97th Driest	Driest since: 1990	1934
Jan–Dec 1991 12-Month	0.73	0.11	0.62	34th Wettest	Wettest since: 1986	2015
Jul 1990–Dec 1991 18-Month	0.50	0.13	0.37	90th Driest	Driest since: 1990	1956
Jul 1990–Dec 1991 18-Month	0.50	0.13	0.37	40th Wettest	Wettest since: 1987	2015
Jan 1990–Dec 1991 24-Month	0.63	0.12	0.51	95th Driest	Driest since: 1990	1934
Jan 1990–Dec 1991 24-Month	0.63	0.12	0.51	35th Wettest	Wettest since: 1987	2015
Jan 1989–Dec 1991 36-Month	0.19	0.12	0.07	69th Driest	Driest since: 1990	1936
	0.19	0.12	0.07	60th Wettest	Wettest since: 1988	2009
	Ties: 1980
Jan 1988–Dec 1991 48-Month	-0.09	0.12	-0.21	36th Driest	Driest since: 1990	1936
	-0.09	0.12	-0.21	92nd Wettest	Wettest since: 1989	2010
	Ties: 1900
Jan 1987–Dec 1991 60-Month	0.05	0.11	-0.06	45th Driest	Driest since: 1989	1937
	0.05	0.11	-0.06	82nd Wettest	Wettest since: 1990	2018
	Ties: 1989

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 1991 Palmer Z-Index Rankings

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