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 1900 Palmer Z-Index Rankings

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Record Wettest
Period	Value	1901-2000 Mean	Anomaly	Rank (1895-2025)	Driest/Wettest Since	Record
December 1900 1-Month	-0.66	-0.11	-0.55	41st Driest	Driest to Date	1910
December 1900 1-Month	-0.66	-0.11	-0.55	90th Wettest	Wettest since: 1899	2015
Nov–Dec 1900 2-Month	-0.11	-0.08	-0.03	63rd Driest	Driest since: 1899	1917
Nov–Dec 1900 2-Month	-0.11	-0.08	-0.03	68th Wettest	Wettest since: 1898	2015
Oct–Dec 1900 3-Month	0.75	-0.05	0.80	97th Driest	Driest since: 1899	1953
Oct–Dec 1900 3-Month	0.75	-0.05	0.80	34th Wettest	Wettest since: 1898	1931
Sep–Dec 1900 4-Month	0.83	0.00	0.83	100th Driest	Driest since: 1899	1953
Sep–Dec 1900 4-Month	0.83	0.00	0.83	31st Wettest	Wettest since: 1896	1931, 1941
Aug–Dec 1900 5-Month	0.86	-0.02	0.88	97th Driest	Driest since: 1899	1953
Aug–Dec 1900 5-Month	0.86	-0.02	0.88	34th Wettest	Wettest since: 1896	1902
Jul–Dec 1900 6-Month	0.98	0.01	0.97	98th Driest	Driest since: 1899	1953
Jul–Dec 1900 6-Month	0.98	0.01	0.97	33rd Wettest	Wettest since: 1896	1902
Jun–Dec 1900 7-Month	0.73	0.02	0.71	89th Driest	Driest since: 1899	1953
Jun–Dec 1900 7-Month	0.73	0.02	0.71	42nd Wettest	Wettest since: 1896	1902
May–Dec 1900 8-Month	0.59	0.04	0.55	86th Driest	Driest since: 1899	1953
May–Dec 1900 8-Month	0.59	0.04	0.55	45th Wettest	Wettest since: 1896	1902
Apr–Dec 1900 9-Month	0.39	0.05	0.34	80th Driest	Driest since: 1899	1988
Apr–Dec 1900 9-Month	0.39	0.05	0.34	51st Wettest	Wettest since: 1896	2008
Mar–Dec 1900 10-Month	0.34	0.03	0.31	78th Driest	Driest since: 1899	1934
Mar–Dec 1900 10-Month	0.34	0.03	0.31	53rd Wettest	Wettest since: 1896	1993
Feb–Dec 1900 11-Month	0.34	0.04	0.30	79th Driest	Driest since: 1899	1934
Feb–Dec 1900 11-Month	0.34	0.04	0.30	52nd Wettest	Wettest since: 1896	2008
Jan–Dec 1900 12-Month	0.15	0.04	0.11	70th Driest	Driest since: 1899	1956
Jan–Dec 1900 12-Month	0.15	0.04	0.11	61st Wettest	Wettest since: 1898	1993
Jul 1899–Dec 1900 18-Month	-0.20	0.04	-0.24	47th Driest	Driest since: 1898	1956
Jul 1899–Dec 1900 18-Month	-0.20	0.04	-0.24	83rd Wettest	Wettest since: 1899	1993
Jan 1899–Dec 1900 24-Month	-0.12	0.04	-0.16	46th Driest	Driest to Date	1934
Jan 1899–Dec 1900 24-Month	-0.12	0.04	-0.16	84th Wettest	Wettest since: 1899	2009
Jan 1898–Dec 1900 36-Month	0.02	0.04	-0.02	54th Driest	Driest since: 1899	1956
Jan 1898–Dec 1900 36-Month	0.02	0.04	-0.02	75th Wettest	Wettest since: 1898	2010
Jan 1897–Dec 1900 48-Month	-0.11	0.04	-0.15	39th Driest	Driest to Date	1956
Jan 1897–Dec 1900 48-Month	-0.11	0.04	-0.15	89th Wettest	Wettest since: 1899	2010
Jan 1896–Dec 1900 60-Month	0.13	0.04	0.09	71st Driest	Driest since: 1899	1957
Jan 1896–Dec 1900 60-Month	0.13	0.04	0.09	56th Wettest	Wettest since: 1899	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 1900 Palmer Z-Index Rankings

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