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 2020 Palmer Z-Index Rankings

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Record Wettest
Period	Value	1901-2000 Mean	Anomaly	Rank (1895-2025)	Driest/Wettest Since	Record
December 2020 1-Month	0.52	-0.11	0.63	94th Driest	Driest since: 2019	1910
December 2020 1-Month	0.52	-0.11	0.63	37th Wettest	Wettest since: 2018	2015
Nov–Dec 2020 2-Month	0.31	-0.08	0.39	83rd Driest	Driest since: 2019	1917
Nov–Dec 2020 2-Month	0.31	-0.08	0.39	48th Wettest	Wettest since: 2018	2015
Oct–Dec 2020 3-Month	0.11	-0.05	0.16	67th Driest	Driest since: 2017	1953
	0.11	-0.05	0.16	64th Wettest	Wettest since: 2019	1931
	Ties: 1965
Sep–Dec 2020 4-Month	0.07	0.00	0.07	69th Driest	Driest since: 2017	1953
Sep–Dec 2020 4-Month	0.07	0.00	0.07	62nd Wettest	Wettest since: 2019	1931, 1941
Aug–Dec 2020 5-Month	-0.53	-0.02	-0.51	45th Driest	Driest since: 2017	1953
Aug–Dec 2020 5-Month	-0.53	-0.02	-0.51	86th Wettest	Wettest since: 2019	1902
Jul–Dec 2020 6-Month	-0.39	0.01	-0.40	50th Driest	Driest since: 2017	1953
	-0.39	0.01	-0.40	81st Wettest	Wettest since: 2019	1902
	Ties: 1924, 1945
Jun–Dec 2020 7-Month	-0.45	0.02	-0.47	48th Driest	Driest since: 2017	1953
	-0.45	0.02	-0.47	83rd Wettest	Wettest since: 2019	1902
	Ties: 2016
May–Dec 2020 8-Month	-0.21	0.04	-0.25	54th Driest	Driest since: 2017	1953
	-0.21	0.04	-0.25	77th Wettest	Wettest since: 2019	1902
	Ties: 1991
Apr–Dec 2020 9-Month	-0.21	0.05	-0.26	50th Driest	Driest since: 2017	1988
	-0.21	0.05	-0.26	81st Wettest	Wettest since: 2019	2008
	Ties: 1962
Mar–Dec 2020 10-Month	-0.16	0.03	-0.19	53rd Driest	Driest since: 2017	1934
Mar–Dec 2020 10-Month	-0.16	0.03	-0.19	78th Wettest	Wettest since: 2019	1993
Feb–Dec 2020 11-Month	-0.23	0.04	-0.27	48th Driest	Driest since: 2017	1934
	-0.23	0.04	-0.27	83rd Wettest	Wettest since: 2019	2008
	Ties: 1912
Jan–Dec 2020 12-Month	-0.05	0.04	-0.09	59th Driest	Driest since: 2017	1956
	-0.05	0.04	-0.09	72nd Wettest	Wettest since: 2019	1993
	Ties: 1958
Jul 2019–Dec 2020 18-Month	0.24	0.04	0.20	74th Driest	Driest since: 2018	1956
Jul 2019–Dec 2020 18-Month	0.24	0.04	0.20	56th Wettest	Wettest since: 2019	1993
Jan 2019–Dec 2020 24-Month	0.64	0.04	0.60	107th Driest	Driest since: 2018	1934
Jan 2019–Dec 2020 24-Month	0.64	0.04	0.60	23rd Wettest	Wettest since: 2019	2009
Jan 2018–Dec 2020 36-Month	0.64	0.04	0.60	106th Driest	Driest since: 2019	1956
Jan 2018–Dec 2020 36-Month	0.64	0.04	0.60	23rd Wettest	Wettest since: 2016	2010
Jan 2017–Dec 2020 48-Month	0.34	0.04	0.30	88th Driest	Driest since: 2019	1956
Jan 2017–Dec 2020 48-Month	0.34	0.04	0.30	40th Wettest	Wettest since: 2017	2010
Jan 2016–Dec 2020 60-Month	0.20	0.04	0.16	79th Driest	Driest since: 2016	1957
	0.20	0.04	0.16	48th Wettest	Wettest since: 2019	2011
	Ties: 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 8

December 2020 Palmer Z-Index Rankings

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