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 2018 Palmer Z-Index Rankings

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Record Wettest
Period	Value	1901-2000 Mean	Anomaly	Rank (1895-2025)	Driest/Wettest Since	Record
December 2018 1-Month	2.96	0.05	2.91	123rd Driest	Driest since: 2017	1976
December 2018 1-Month	2.96	0.05	2.91	8th Wettest	Wettest since: 2015	2015
Nov–Dec 2018 2-Month	1.94	0.10	1.84	120th Driest	Driest since: 2017	1976
Nov–Dec 2018 2-Month	1.94	0.10	1.84	11th Wettest	Wettest since: 2015	2015
Oct–Dec 2018 3-Month	2.27	0.11	2.16	120th Driest	Driest since: 2017	1955
Oct–Dec 2018 3-Month	2.27	0.11	2.16	11th Wettest	Wettest since: 2015	2015
Sep–Dec 2018 4-Month	2.47	0.14	2.33	124th Driest	Driest since: 2017	1939
Sep–Dec 2018 4-Month	2.47	0.14	2.33	7th Wettest	Wettest since: 2015	2015
Aug–Dec 2018 5-Month	2.91	0.12	2.79	129th Driest	Driest since: 2017	1976
Aug–Dec 2018 5-Month	2.91	0.12	2.79	2nd Wettest	Wettest since: 2015	2015
Jul–Dec 2018 6-Month	2.43	0.13	2.30	126th Driest	Driest since: 2017	1976
Jul–Dec 2018 6-Month	2.43	0.13	2.30	5th Wettest	Wettest since: 2015	2015
Jun–Dec 2018 7-Month	2.57	0.13	2.44	127th Driest	Driest since: 2017	1976
Jun–Dec 2018 7-Month	2.57	0.13	2.44	4th Wettest	Wettest since: 2015	2015
May–Dec 2018 8-Month	2.18	0.13	2.05	125th Driest	Driest since: 2017	1936
May–Dec 2018 8-Month	2.18	0.13	2.05	6th Wettest	Wettest since: 2015	2015
Apr–Dec 2018 9-Month	1.88	0.13	1.75	119th Driest	Driest since: 2017	1934
Apr–Dec 2018 9-Month	1.88	0.13	1.75	12th Wettest	Wettest since: 2015	2015
Mar–Dec 2018 10-Month	1.80	0.10	1.70	125th Driest	Driest since: 2017	1934
Mar–Dec 2018 10-Month	1.80	0.10	1.70	6th Wettest	Wettest since: 2015	2015
Feb–Dec 2018 11-Month	1.72	0.11	1.61	125th Driest	Driest since: 2017	1934
Feb–Dec 2018 11-Month	1.72	0.11	1.61	6th Wettest	Wettest since: 2015	2015
Jan–Dec 2018 12-Month	1.65	0.11	1.54	125th Driest	Driest since: 2017	1934
Jan–Dec 2018 12-Month	1.65	0.11	1.54	6th Wettest	Wettest since: 2015	2015
Jul 2017–Dec 2018 18-Month	1.35	0.13	1.22	120th Driest	Driest since: 2017	1956
	1.35	0.13	1.22	10th Wettest	Wettest since: 2016	2015
	Ties: 1983, 2007
Jan 2017–Dec 2018 24-Month	1.16	0.12	1.04	117th Driest	Driest since: 2017	1934
Jan 2017–Dec 2018 24-Month	1.16	0.12	1.04	13th Wettest	Wettest since: 2016	2015
Jan 2016–Dec 2018 36-Month	0.96	0.12	0.84	115th Driest	Driest since: 2015	1936
Jan 2016–Dec 2018 36-Month	0.96	0.12	0.84	14th Wettest	Wettest since: 2017	2009
Jan 2015–Dec 2018 48-Month	1.25	0.12	1.13	126th Driest	Driest since: 2017	1936
Jan 2015–Dec 2018 48-Month	1.25	0.12	1.13	2nd Wettest	Wettest since: 2010	2010
Jan 2014–Dec 2018 60-Month	1.24	0.11	1.13	126th Driest	Driest since: 2017	1937
Jan 2014–Dec 2018 60-Month	1.24	0.11	1.13	1st 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 2018 Palmer Z-Index Rankings

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