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 2001 Palmer Z-Index Rankings

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Record Wettest
Period	Value	1901-2000 Mean	Anomaly	Rank (1895-2025)	Driest/Wettest Since	Record
December 2001 1-Month	-0.70	0.05	-0.75	39th Driest	Driest since: 1999	1976
December 2001 1-Month	-0.70	0.05	-0.75	92nd Wettest	Wettest since: 2000	2015
Nov–Dec 2001 2-Month	-0.59	0.10	-0.69	42nd Driest	Driest since: 1999	1976
	-0.59	0.10	-0.69	89th Wettest	Wettest since: 2000	2015
	Ties: 1929
Oct–Dec 2001 3-Month	-0.55	0.11	-0.66	39th Driest	Driest since: 1999	1955
	-0.55	0.11	-0.66	92nd Wettest	Wettest since: 2000	2015
	Ties: 1899
Sep–Dec 2001 4-Month	-0.31	0.14	-0.45	53rd Driest	Driest since: 2000	1939
Sep–Dec 2001 4-Month	-0.31	0.14	-0.45	78th Wettest	Wettest since: 1997	2015
Aug–Dec 2001 5-Month	-0.30	0.12	-0.42	50th Driest	Driest since: 2000	1976
Aug–Dec 2001 5-Month	-0.30	0.12	-0.42	81st Wettest	Wettest since: 1998	2015
Jul–Dec 2001 6-Month	-0.48	0.13	-0.61	43rd Driest	Driest since: 2000	1976
Jul–Dec 2001 6-Month	-0.48	0.13	-0.61	88th Wettest	Wettest since: 1998	2015
Jun–Dec 2001 7-Month	-0.48	0.13	-0.61	37th Driest	Driest since: 2000	1976
	-0.48	0.13	-0.61	94th Wettest	Wettest since: 1999	2015
	Ties: 1898
May–Dec 2001 8-Month	0.16	0.13	0.03	63rd Driest	Driest since: 2000	1936
May–Dec 2001 8-Month	0.16	0.13	0.03	68th Wettest	Wettest since: 1998	2015
Apr–Dec 2001 9-Month	0.17	0.13	0.04	65th Driest	Driest since: 2000	1934
Apr–Dec 2001 9-Month	0.17	0.13	0.04	66th Wettest	Wettest since: 1999	2015
Mar–Dec 2001 10-Month	0.08	0.10	-0.02	62nd Driest	Driest since: 2000	1934
	0.08	0.10	-0.02	69th Wettest	Wettest since: 1999	2015
	Ties: 1931
Feb–Dec 2001 11-Month	0.12	0.11	0.01	67th Driest	Driest since: 2000	1934
Feb–Dec 2001 11-Month	0.12	0.11	0.01	64th Wettest	Wettest since: 1999	2015
Jan–Dec 2001 12-Month	0.16	0.11	0.05	68th Driest	Driest since: 2000	1934
	0.16	0.11	0.05	63rd Wettest	Wettest since: 1999	2015
	Ties: 1975
Jul 2000–Dec 2001 18-Month	-0.32	0.13	-0.45	32nd Driest	Driest since: 2000	1956
	-0.32	0.13	-0.45	98th Wettest	Wettest since: 1999	2015
	Ties: 1953
Jan 2000–Dec 2001 24-Month	-0.55	0.12	-0.67	24th Driest	Driest since: 1989	1934
	-0.55	0.12	-0.67	106th Wettest	Wettest since: 2000	2015
	Ties: 1967
Jan 1999–Dec 2001 36-Month	-0.26	0.12	-0.38	34th Driest	Driest since: 1990	1936
Jan 1999–Dec 2001 36-Month	-0.26	0.12	-0.38	95th Wettest	Wettest since: 2000	2009
Jan 1998–Dec 2001 48-Month	0.04	0.12	-0.08	51st Driest	Driest since: 2000	1936
Jan 1998–Dec 2001 48-Month	0.04	0.12	-0.08	77th Wettest	Wettest since: 1999	2010
Jan 1997–Dec 2001 60-Month	-0.01	0.11	-0.12	36th Driest	Driest since: 1981	1937
	-0.01	0.11	-0.12	91st Wettest	Wettest since: 2000	2018
	Ties: 1967

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 2001 Palmer Z-Index Rankings

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