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 1970 Palmer Z-Index Rankings

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Record Wettest
Period	Value	1901-2000 Mean	Anomaly	Rank (1895-2025)	Driest/Wettest Since	Record
December 1970 1-Month	0.09	0.05	0.04	69th Driest	Driest since: 1967	1976
December 1970 1-Month	0.09	0.05	0.04	62nd Wettest	Wettest since: 1969	2015
Nov–Dec 1970 2-Month	0.65	0.10	0.55	92nd Driest	Driest since: 1969	1976
Nov–Dec 1970 2-Month	0.65	0.10	0.55	39th Wettest	Wettest since: 1968	2015
Oct–Dec 1970 3-Month	1.50	0.11	1.39	108th Driest	Driest since: 1969	1955
Oct–Dec 1970 3-Month	1.50	0.11	1.39	23rd Wettest	Wettest since: 1968	2015
Sep–Dec 1970 4-Month	1.17	0.14	1.03	99th Driest	Driest since: 1969	1939
Sep–Dec 1970 4-Month	1.17	0.14	1.03	32nd Wettest	Wettest since: 1968	2015
Aug–Dec 1970 5-Month	0.62	0.12	0.50	86th Driest	Driest since: 1969	1976
Aug–Dec 1970 5-Month	0.62	0.12	0.50	45th Wettest	Wettest since: 1968	2015
Jul–Dec 1970 6-Month	0.31	0.13	0.18	74th Driest	Driest since: 1967	1976
Jul–Dec 1970 6-Month	0.31	0.13	0.18	57th Wettest	Wettest since: 1969	2015
Jun–Dec 1970 7-Month	-0.02	0.13	-0.15	63rd Driest	Driest since: 1966	1976
Jun–Dec 1970 7-Month	-0.02	0.13	-0.15	68th Wettest	Wettest since: 1969	2015
May–Dec 1970 8-Month	-0.01	0.13	-0.14	57th Driest	Driest since: 1966	1936
May–Dec 1970 8-Month	-0.01	0.13	-0.14	74th Wettest	Wettest since: 1969	2015
Apr–Dec 1970 9-Month	-0.13	0.13	-0.26	49th Driest	Driest since: 1966	1934
Apr–Dec 1970 9-Month	-0.13	0.13	-0.26	82nd Wettest	Wettest since: 1969	2015
Mar–Dec 1970 10-Month	0.00	0.10	-0.10	56th Driest	Driest since: 1967	1934
Mar–Dec 1970 10-Month	0.00	0.10	-0.10	75th Wettest	Wettest since: 1969	2015
Feb–Dec 1970 11-Month	-0.08	0.11	-0.19	52nd Driest	Driest since: 1967	1934
Feb–Dec 1970 11-Month	-0.08	0.11	-0.19	79th Wettest	Wettest since: 1969	2015
Jan–Dec 1970 12-Month	-0.11	0.11	-0.22	54th Driest	Driest since: 1967	1934
Jan–Dec 1970 12-Month	-0.11	0.11	-0.22	77th Wettest	Wettest since: 1969	2015
Jul 1969–Dec 1970 18-Month	0.10	0.13	-0.03	59th Driest	Driest since: 1968	1956
	0.10	0.13	-0.03	71st Wettest	Wettest since: 1969	2015
	Ties: 1912
Jan 1969–Dec 1970 24-Month	0.23	0.12	0.11	74th Driest	Driest since: 1968	1934
	0.23	0.12	0.11	56th Wettest	Wettest since: 1969	2015
	Ties: 1942
Jan 1968–Dec 1970 36-Month	0.24	0.12	0.12	73rd Driest	Driest since: 1969	1936
Jan 1968–Dec 1970 36-Month	0.24	0.12	0.12	56th Wettest	Wettest since: 1966	2009
Jan 1967–Dec 1970 48-Month	0.06	0.12	-0.06	52nd Driest	Driest since: 1969	1936
Jan 1967–Dec 1970 48-Month	0.06	0.12	-0.06	76th Wettest	Wettest since: 1968	2010
Jan 1966–Dec 1970 60-Month	-0.08	0.11	-0.19	30th Driest	Driest since: 1960	1937
	-0.08	0.11	-0.19	97th Wettest	Wettest since: 1969	2018
	Ties: 1928

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 1970 Palmer Z-Index Rankings

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