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 8

December 1921 Palmer Z-Index Rankings

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Record Wettest
Period	Value	1901-2000 Mean	Anomaly	Rank (1895-2025)	Driest/Wettest Since	Record
December 1921 1-Month	-0.17	-0.11	-0.06	65th Driest	Driest since: 1920	1910
December 1921 1-Month	-0.17	-0.11	-0.06	66th Wettest	Wettest since: 1914	2015
Nov–Dec 1921 2-Month	-0.56	-0.08	-0.48	43rd Driest	Driest since: 1917	1917
Nov–Dec 1921 2-Month	-0.56	-0.08	-0.48	88th Wettest	Wettest since: 1920	2015
Oct–Dec 1921 3-Month	-0.23	-0.05	-0.18	53rd Driest	Driest since: 1920	1953
Oct–Dec 1921 3-Month	-0.23	-0.05	-0.18	78th Wettest	Wettest since: 1919	1931
Sep–Dec 1921 4-Month	0.55	0.00	0.55	93rd Driest	Driest since: 1920	1953
Sep–Dec 1921 4-Month	0.55	0.00	0.55	38th Wettest	Wettest since: 1919	1931, 1941
Aug–Dec 1921 5-Month	0.59	-0.02	0.61	90th Driest	Driest since: 1920	1953
Aug–Dec 1921 5-Month	0.59	-0.02	0.61	41st Wettest	Wettest since: 1919	1902
Jul–Dec 1921 6-Month	0.29	0.01	0.28	78th Driest	Driest since: 1920	1953
Jul–Dec 1921 6-Month	0.29	0.01	0.28	53rd Wettest	Wettest since: 1919	1902
Jun–Dec 1921 7-Month	0.31	0.02	0.29	78th Driest	Driest since: 1920	1953
Jun–Dec 1921 7-Month	0.31	0.02	0.29	53rd Wettest	Wettest since: 1919	1902
May–Dec 1921 8-Month	0.11	0.04	0.07	66th Driest	Driest since: 1920	1953
May–Dec 1921 8-Month	0.11	0.04	0.07	65th Wettest	Wettest since: 1919	1902
Apr–Dec 1921 9-Month	0.19	0.05	0.14	66th Driest	Driest since: 1920	1988
Apr–Dec 1921 9-Month	0.19	0.05	0.14	65th Wettest	Wettest since: 1919	2008
Mar–Dec 1921 10-Month	0.02	0.03	-0.01	60th Driest	Driest since: 1918	1934
Mar–Dec 1921 10-Month	0.02	0.03	-0.01	71st Wettest	Wettest since: 1920	1993
Feb–Dec 1921 11-Month	-0.05	0.04	-0.09	59th Driest	Driest since: 1918	1934
Feb–Dec 1921 11-Month	-0.05	0.04	-0.09	72nd Wettest	Wettest since: 1920	2008
Jan–Dec 1921 12-Month	-0.11	0.04	-0.15	52nd Driest	Driest since: 1918	1956
Jan–Dec 1921 12-Month	-0.11	0.04	-0.15	79th Wettest	Wettest since: 1920	1993
Jul 1920–Dec 1921 18-Month	-0.16	0.04	-0.20	49th Driest	Driest since: 1918	1956
Jul 1920–Dec 1921 18-Month	-0.16	0.04	-0.20	81st Wettest	Wettest since: 1920	1993
Jan 1920–Dec 1921 24-Month	-0.05	0.04	-0.09	53rd Driest	Driest since: 1918	1934
	-0.05	0.04	-0.09	77th Wettest	Wettest since: 1920	2009
	Ties: 1899
Jan 1919–Dec 1921 36-Month	0.28	0.04	0.24	87th Driest	Driest since: 1920	1956
Jan 1919–Dec 1921 36-Month	0.28	0.04	0.24	42nd Wettest	Wettest since: 1909	2010
Jan 1918–Dec 1921 48-Month	-0.04	0.04	-0.08	47th Driest	Driest since: 1920	1956
Jan 1918–Dec 1921 48-Month	-0.04	0.04	-0.08	81st Wettest	Wettest since: 1915	2010
Jan 1917–Dec 1921 60-Month	-0.20	0.04	-0.24	26th Driest	Driest since: 1920	1957
Jan 1917–Dec 1921 60-Month	-0.20	0.04	-0.24	101st Wettest	Wettest since: 1919	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 1921 Palmer Z-Index Rankings

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