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 1975 Palmer Z-Index Rankings

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Record Wettest
Period	Value	1901-2000 Mean	Anomaly	Rank (1895-2025)	Driest/Wettest Since	Record
December 1975 1-Month	-0.25	0.05	-0.30	55th Driest	Driest since: 1974	1976
December 1975 1-Month	-0.25	0.05	-0.30	76th Wettest	Wettest since: 1973	2015
Nov–Dec 1975 2-Month	0.94	0.10	0.84	103rd Driest	Driest since: 1974	1976
Nov–Dec 1975 2-Month	0.94	0.10	0.84	28th Wettest	Wettest since: 1973	2015
Oct–Dec 1975 3-Month	-0.34	0.11	-0.45	52nd Driest	Driest since: 1974	1955
Oct–Dec 1975 3-Month	-0.34	0.11	-0.45	79th Wettest	Wettest since: 1973	2015
Sep–Dec 1975 4-Month	-0.48	0.14	-0.62	45th Driest	Driest since: 1974	1939
Sep–Dec 1975 4-Month	-0.48	0.14	-0.62	86th Wettest	Wettest since: 1973	2015
Aug–Dec 1975 5-Month	-0.16	0.12	-0.28	58th Driest	Driest since: 1974	1976
	-0.16	0.12	-0.28	73rd Wettest	Wettest since: 1973	2015
	Ties: 1916, 1942
Jul–Dec 1975 6-Month	-0.56	0.13	-0.69	38th Driest	Driest since: 1974	1976
Jul–Dec 1975 6-Month	-0.56	0.13	-0.69	93rd Wettest	Wettest since: 1973	2015
Jun–Dec 1975 7-Month	-0.31	0.13	-0.44	47th Driest	Driest since: 1974	1976
Jun–Dec 1975 7-Month	-0.31	0.13	-0.44	84th Wettest	Wettest since: 1973	2015
May–Dec 1975 8-Month	-0.40	0.13	-0.53	40th Driest	Driest since: 1974	1936
May–Dec 1975 8-Month	-0.40	0.13	-0.53	91st Wettest	Wettest since: 1973	2015
Apr–Dec 1975 9-Month	0.05	0.13	-0.08	56th Driest	Driest since: 1974	1934
	0.05	0.13	-0.08	75th Wettest	Wettest since: 1973	2015
	Ties: 1917
Mar–Dec 1975 10-Month	0.06	0.10	-0.04	60th Driest	Driest since: 1974	1934
	0.06	0.10	-0.04	71st Wettest	Wettest since: 1973	2015
	Ties: 1943
Feb–Dec 1975 11-Month	0.03	0.11	-0.08	63rd Driest	Driest since: 1974	1934
Feb–Dec 1975 11-Month	0.03	0.11	-0.08	68th Wettest	Wettest since: 1973	2015
Jan–Dec 1975 12-Month	0.16	0.11	0.05	68th Driest	Driest since: 1974	1934
Jan–Dec 1975 12-Month	0.16	0.11	0.05	63rd Wettest	Wettest since: 1973	2015
Jul 1974–Dec 1975 18-Month	-0.20	0.13	-0.33	45th Driest	Driest since: 1968	1956
Jul 1974–Dec 1975 18-Month	-0.20	0.13	-0.33	85th Wettest	Wettest since: 1974	2015
Jan 1974–Dec 1975 24-Month	-0.12	0.12	-0.24	41st Driest	Driest since: 1967	1934
	-0.12	0.12	-0.24	89th Wettest	Wettest since: 1974	2015
	Ties: 1950
Jan 1973–Dec 1975 36-Month	0.48	0.12	0.36	91st Driest	Driest since: 1972	1936
	0.48	0.12	0.36	38th Wettest	Wettest since: 1974	2009
	Ties: 1915
Jan 1972–Dec 1975 48-Month	0.71	0.12	0.59	109th Driest	Driest since: 1974	1936
Jan 1972–Dec 1975 48-Month	0.71	0.12	0.59	19th Wettest	Wettest since: 1973	2010
Jan 1971–Dec 1975 60-Month	0.59	0.11	0.48	105th Driest	Driest since: 1974	1937
Jan 1971–Dec 1975 60-Month	0.59	0.11	0.48	22nd Wettest	Wettest since: 1973	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 1975 Palmer Z-Index Rankings

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