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 1951 Palmer Z-Index Rankings

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Record Wettest
Period	Value	1901-2000 Mean	Anomaly	Rank (1895-2025)	Driest/Wettest Since	Record
December 1951 1-Month	0.51	0.05	0.46	92nd Driest	Driest since: 1950	1976
December 1951 1-Month	0.51	0.05	0.46	39th Wettest	Wettest since: 1945	2015
Nov–Dec 1951 2-Month	0.35	0.10	0.25	79th Driest	Driest since: 1950	1976
Nov–Dec 1951 2-Month	0.35	0.10	0.25	52nd Wettest	Wettest since: 1948	2015
Oct–Dec 1951 3-Month	0.74	0.11	0.63	91st Driest	Driest since: 1950	1955
Oct–Dec 1951 3-Month	0.74	0.11	0.63	40th Wettest	Wettest since: 1946	2015
Sep–Dec 1951 4-Month	0.83	0.14	0.69	93rd Driest	Driest since: 1950	1939
Sep–Dec 1951 4-Month	0.83	0.14	0.69	38th Wettest	Wettest since: 1946	2015
Aug–Dec 1951 5-Month	1.90	0.12	1.78	119th Driest	Driest since: 1950	1976
Aug–Dec 1951 5-Month	1.90	0.12	1.78	12th Wettest	Wettest since: 1909	2015
Jul–Dec 1951 6-Month	1.78	0.13	1.65	114th Driest	Driest since: 1950	1976
Jul–Dec 1951 6-Month	1.78	0.13	1.65	17th Wettest	Wettest since: 1915	2015
Jun–Dec 1951 7-Month	1.95	0.13	1.82	121st Driest	Driest since: 1950	1976
Jun–Dec 1951 7-Month	1.95	0.13	1.82	10th Wettest	Wettest since: 1909	2015
May–Dec 1951 8-Month	1.81	0.13	1.68	119th Driest	Driest since: 1950	1936
May–Dec 1951 8-Month	1.81	0.13	1.68	12th Wettest	Wettest since: 1915	2015
Apr–Dec 1951 9-Month	2.11	0.13	1.98	126th Driest	Driest since: 1950	1934
Apr–Dec 1951 9-Month	2.11	0.13	1.98	5th Wettest	Wettest since: 1902	2015
Mar–Dec 1951 10-Month	2.22	0.10	2.12	129th Driest	Driest since: 1950	1934
Mar–Dec 1951 10-Month	2.22	0.10	2.12	2nd Wettest	Wettest to Date	2015
Feb–Dec 1951 11-Month	2.27	0.11	2.16	129th Driest	Driest since: 1950	1934
Feb–Dec 1951 11-Month	2.27	0.11	2.16	2nd Wettest	Wettest to Date	2015
Jan–Dec 1951 12-Month	2.02	0.11	1.91	129th Driest	Driest since: 1950	1934
Jan–Dec 1951 12-Month	2.02	0.11	1.91	2nd Wettest	Wettest to Date	2015
Jul 1950–Dec 1951 18-Month	1.33	0.13	1.20	117th Driest	Driest since: 1950	1956
Jul 1950–Dec 1951 18-Month	1.33	0.13	1.20	13th Wettest	Wettest since: 1909	2015
Jan 1950–Dec 1951 24-Month	1.08	0.12	0.96	115th Driest	Driest since: 1950	1934
Jan 1950–Dec 1951 24-Month	1.08	0.12	0.96	15th Wettest	Wettest since: 1909	2015
Jan 1949–Dec 1951 36-Month	0.59	0.12	0.47	96th Driest	Driest since: 1950	1936
	0.59	0.12	0.47	33rd Wettest	Wettest since: 1946	2009
	Ties: 1945
Jan 1948–Dec 1951 48-Month	0.35	0.12	0.23	81st Driest	Driest since: 1950	1936
Jan 1948–Dec 1951 48-Month	0.35	0.12	0.23	47th Wettest	Wettest since: 1947	2010
Jan 1947–Dec 1951 60-Month	0.30	0.11	0.19	78th Driest	Driest since: 1950	1937
Jan 1947–Dec 1951 60-Month	0.30	0.11	0.19	49th Wettest	Wettest since: 1948	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 1951 Palmer Z-Index Rankings

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