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 1899 Palmer Z-Index Rankings

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Record Wettest
Period	Value	1901-2000 Mean	Anomaly	Rank (1895-2025)	Driest/Wettest Since	Record
December 1899 1-Month	0.28	0.05	0.23	82nd Driest	Driest since: 1898	1976
December 1899 1-Month	0.28	0.05	0.23	49th Wettest	Wettest since: 1897	2015
Nov–Dec 1899 2-Month	-0.53	0.10	-0.63	44th Driest	Driest since: 1898	1976
	-0.53	0.10	-0.63	87th Wettest	Wettest since: 1898	2015
	Ties: 1898
Oct–Dec 1899 3-Month	-0.55	0.11	-0.66	39th Driest	Driest since: 1897	1955
Oct–Dec 1899 3-Month	-0.55	0.11	-0.66	92nd Wettest	Wettest since: 1898	2015
Sep–Dec 1899 4-Month	-1.05	0.14	-1.19	22nd Driest	Driest since: 1897	1939
Sep–Dec 1899 4-Month	-1.05	0.14	-1.19	109th Wettest	Wettest since: 1898	2015
Aug–Dec 1899 5-Month	-0.76	0.12	-0.88	31st Driest	Driest since: 1897	1976
Aug–Dec 1899 5-Month	-0.76	0.12	-0.88	100th Wettest	Wettest since: 1898	2015
Jul–Dec 1899 6-Month	-0.77	0.13	-0.90	30th Driest	Driest since: 1897	1976
Jul–Dec 1899 6-Month	-0.77	0.13	-0.90	101st Wettest	Wettest since: 1898	2015
Jun–Dec 1899 7-Month	-0.27	0.13	-0.40	51st Driest	Driest since: 1898	1976
Jun–Dec 1899 7-Month	-0.27	0.13	-0.40	80th Wettest	Wettest since: 1896	2015
May–Dec 1899 8-Month	-0.02	0.13	-0.15	56th Driest	Driest since: 1898	1936
May–Dec 1899 8-Month	-0.02	0.13	-0.15	75th Wettest	Wettest since: 1896	2015
Apr–Dec 1899 9-Month	-0.09	0.13	-0.22	50th Driest	Driest since: 1898	1934
Apr–Dec 1899 9-Month	-0.09	0.13	-0.22	81st Wettest	Wettest since: 1896	2015
Mar–Dec 1899 10-Month	-0.16	0.10	-0.26	49th Driest	Driest since: 1898	1934
Mar–Dec 1899 10-Month	-0.16	0.10	-0.26	82nd Wettest	Wettest since: 1896	2015
Feb–Dec 1899 11-Month	-0.22	0.11	-0.33	46th Driest	Driest since: 1898	1934
Feb–Dec 1899 11-Month	-0.22	0.11	-0.33	85th Wettest	Wettest since: 1896	2015
Jan–Dec 1899 12-Month	-0.31	0.11	-0.42	39th Driest	Driest since: 1898	1934
	-0.31	0.11	-0.42	92nd Wettest	Wettest since: 1897	2015
	Ties: 1895
Jul 1898–Dec 1899 18-Month	-0.36	0.13	-0.49	30th Driest	Driest since: 1898	1956
Jul 1898–Dec 1899 18-Month	-0.36	0.13	-0.49	100th Wettest	Wettest since: 1897	2015
Jan 1898–Dec 1899 24-Month	-0.41	0.12	-0.53	27th Driest	Driest to Date	1934
Jan 1898–Dec 1899 24-Month	-0.41	0.12	-0.53	103rd Wettest	Wettest since: 1898	2015
Jan 1897–Dec 1899 36-Month	-0.37	0.12	-0.49	25th Driest	Driest to Date	1936
Jan 1897–Dec 1899 36-Month	-0.37	0.12	-0.49	104th Wettest	Wettest since: 1898	2009
Jan 1896–Dec 1899 48-Month	0.03	0.12	-0.09	48th Driest	Driest since: 1898	1936
Jan 1896–Dec 1899 48-Month	0.03	0.12	-0.09	80th Wettest	Wettest since: 1898	2010
Jan 1895–Dec 1899 60-Month	-0.04	0.11	-0.15	33rd Driest	Driest to Date	1937
Jan 1895–Dec 1899 60-Month	-0.04	0.11	-0.15	94th Wettest	Wettest to Date	2018

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 1899 Palmer Z-Index Rankings

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