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 1966 Palmer Z-Index Rankings

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Record Wettest
Period	Value	1901-2000 Mean	Anomaly	Rank (1895-2025)	Driest/Wettest Since	Record
December 1966 1-Month	-0.91	0.05	-0.96	28th Driest	Driest since: 1963	1976
December 1966 1-Month	-0.91	0.05	-0.96	103rd Wettest	Wettest since: 1965	2015
Nov–Dec 1966 2-Month	-1.53	0.10	-1.63	13th Driest	Driest since: 1963	1976
Nov–Dec 1966 2-Month	-1.53	0.10	-1.63	118th Wettest	Wettest since: 1965	2015
Oct–Dec 1966 3-Month	-1.57	0.11	-1.68	10th Driest	Driest since: 1963	1955
Oct–Dec 1966 3-Month	-1.57	0.11	-1.68	121st Wettest	Wettest since: 1965	2015
Sep–Dec 1966 4-Month	-1.62	0.14	-1.76	8th Driest	Driest since: 1955	1939
Sep–Dec 1966 4-Month	-1.62	0.14	-1.76	123rd Wettest	Wettest since: 1965	2015
Aug–Dec 1966 5-Month	-1.25	0.12	-1.37	18th Driest	Driest since: 1958	1976
Aug–Dec 1966 5-Month	-1.25	0.12	-1.37	113th Wettest	Wettest since: 1965	2015
Jul–Dec 1966 6-Month	-1.21	0.13	-1.34	18th Driest	Driest since: 1956	1976
Jul–Dec 1966 6-Month	-1.21	0.13	-1.34	113th Wettest	Wettest since: 1965	2015
Jun–Dec 1966 7-Month	-0.80	0.13	-0.93	26th Driest	Driest since: 1956	1976
Jun–Dec 1966 7-Month	-0.80	0.13	-0.93	105th Wettest	Wettest since: 1965	2015
May–Dec 1966 8-Month	-0.76	0.13	-0.89	26th Driest	Driest since: 1963	1936
May–Dec 1966 8-Month	-0.76	0.13	-0.89	105th Wettest	Wettest since: 1965	2015
Apr–Dec 1966 9-Month	-0.84	0.13	-0.97	21st Driest	Driest since: 1956	1934
	-0.84	0.13	-0.97	110th Wettest	Wettest since: 1965	2015
	Ties: 1897
Mar–Dec 1966 10-Month	-0.81	0.10	-0.91	21st Driest	Driest since: 1956	1934
Mar–Dec 1966 10-Month	-0.81	0.10	-0.91	110th Wettest	Wettest since: 1965	2015
Feb–Dec 1966 11-Month	-0.74	0.11	-0.85	22nd Driest	Driest since: 1956	1934
Feb–Dec 1966 11-Month	-0.74	0.11	-0.85	109th Wettest	Wettest since: 1965	2015
Jan–Dec 1966 12-Month	-0.62	0.11	-0.73	22nd Driest	Driest since: 1956	1934
	-0.62	0.11	-0.73	109th Wettest	Wettest since: 1965	2015
	Ties: 1925
Jul 1965–Dec 1966 18-Month	0.03	0.13	-0.10	53rd Driest	Driest since: 1964	1956
	0.03	0.13	-0.10	77th Wettest	Wettest since: 1965	2015
	Ties: 1927
Jan 1965–Dec 1966 24-Month	0.28	0.12	0.16	76th Driest	Driest since: 1964	1934
Jan 1965–Dec 1966 24-Month	0.28	0.12	0.16	54th Wettest	Wettest since: 1965	2015
Jan 1964–Dec 1966 36-Month	0.29	0.12	0.17	74th Driest	Driest since: 1964	1936
Jan 1964–Dec 1966 36-Month	0.29	0.12	0.17	55th Wettest	Wettest since: 1965	2009
Jan 1963–Dec 1966 48-Month	0.11	0.12	-0.01	62nd Driest	Driest since: 1959	1936
Jan 1963–Dec 1966 48-Month	0.11	0.12	-0.01	66th Wettest	Wettest since: 1965	2010
Jan 1962–Dec 1966 60-Month	0.21	0.11	0.10	67th Driest	Driest since: 1960	1937
	0.21	0.11	0.10	60th Wettest	Wettest since: 1965	2018
	Ties: 1915, 1923

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 1966 Palmer Z-Index Rankings

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