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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 8

December 1984 Palmer Z-Index Rankings

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Record Wettest
Period	Value	1901-2000 Mean	Anomaly	Rank (1895-2025)	Driest/Wettest Since	Record
December 1984 1-Month	1.25	-0.11	1.36	104th Driest	Driest since: 1983	1910
December 1984 1-Month	1.25	-0.11	1.36	27th Wettest	Wettest since: 1982	2015
Nov–Dec 1984 2-Month	0.55	-0.08	0.63	89th Driest	Driest since: 1980	1917
Nov–Dec 1984 2-Month	0.55	-0.08	0.63	42nd Wettest	Wettest since: 1983	2015
Oct–Dec 1984 3-Month	1.14	-0.05	1.19	106th Driest	Driest since: 1981	1953
Oct–Dec 1984 3-Month	1.14	-0.05	1.19	25th Wettest	Wettest since: 1983	1931
Sep–Dec 1984 4-Month	0.43	0.00	0.43	86th Driest	Driest since: 1981	1953
Sep–Dec 1984 4-Month	0.43	0.00	0.43	45th Wettest	Wettest since: 1983	1931, 1941
Aug–Dec 1984 5-Month	-0.19	-0.02	-0.17	64th Driest	Driest since: 1979	1953
Aug–Dec 1984 5-Month	-0.19	-0.02	-0.17	67th Wettest	Wettest since: 1983	1902
Jul–Dec 1984 6-Month	0.12	0.01	0.11	71st Driest	Driest since: 1983	1953
Jul–Dec 1984 6-Month	0.12	0.01	0.11	60th Wettest	Wettest since: 1982	1902
Jun–Dec 1984 7-Month	0.22	0.02	0.20	74th Driest	Driest since: 1983	1953
Jun–Dec 1984 7-Month	0.22	0.02	0.20	57th Wettest	Wettest since: 1982	1902
May–Dec 1984 8-Month	0.43	0.04	0.39	78th Driest	Driest since: 1983	1953
May–Dec 1984 8-Month	0.43	0.04	0.39	53rd Wettest	Wettest since: 1982	1902
Apr–Dec 1984 9-Month	0.76	0.05	0.71	95th Driest	Driest since: 1983	1988
	0.76	0.05	0.71	36th Wettest	Wettest since: 1982	2008
	Ties: 1941
Mar–Dec 1984 10-Month	0.74	0.03	0.71	95th Driest	Driest since: 1983	1934
Mar–Dec 1984 10-Month	0.74	0.03	0.71	36th Wettest	Wettest since: 1982	1993
Feb–Dec 1984 11-Month	0.66	0.04	0.62	96th Driest	Driest since: 1983	1934
	0.66	0.04	0.62	35th Wettest	Wettest since: 1982	2008
	Ties: 1931
Jan–Dec 1984 12-Month	0.58	0.04	0.54	92nd Driest	Driest since: 1983	1956
	0.58	0.04	0.54	39th Wettest	Wettest since: 1982	1993
	Ties: 1941
Jul 1983–Dec 1984 18-Month	0.31	0.04	0.27	79th Driest	Driest since: 1980	1956
	0.31	0.04	0.27	51st Wettest	Wettest since: 1983	1993
	Ties: 1906, 1943
Jan 1983–Dec 1984 24-Month	0.32	0.04	0.28	79th Driest	Driest since: 1981	1934
	0.32	0.04	0.28	51st Wettest	Wettest since: 1983	2009
	Ties: 1965
Jan 1982–Dec 1984 36-Month	0.89	0.04	0.85	120th Driest	Driest since: 1983	1956
Jan 1982–Dec 1984 36-Month	0.89	0.04	0.85	9th Wettest	Wettest since: 1974	2010
Jan 1981–Dec 1984 48-Month	0.77	0.04	0.73	118th Driest	Driest since: 1983	1956
Jan 1981–Dec 1984 48-Month	0.77	0.04	0.73	10th Wettest	Wettest since: 1962	2010
Jan 1980–Dec 1984 60-Month	0.65	0.04	0.61	114th Driest	Driest since: 1983	1957
Jan 1980–Dec 1984 60-Month	0.65	0.04	0.61	13th Wettest	Wettest since: 1982	2011

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 8

December 1984 Palmer Z-Index Rankings

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