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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 1977 Palmer Z-Index Rankings

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Record Wettest
Period	Value	1901-2000 Mean	Anomaly	Rank (1895-2025)	Driest/Wettest Since	Record
December 1977 1-Month	0.26	-0.11	0.37	83rd Driest	Driest since: 1976	1910
December 1977 1-Month	0.26	-0.11	0.37	48th Wettest	Wettest since: 1973	2015
Nov–Dec 1977 2-Month	0.02	-0.08	0.10	73rd Driest	Driest since: 1976	1917
Nov–Dec 1977 2-Month	0.02	-0.08	0.10	58th Wettest	Wettest since: 1975	2015
Oct–Dec 1977 3-Month	1.59	-0.05	1.64	116th Driest	Driest since: 1976	1953
Oct–Dec 1977 3-Month	1.59	-0.05	1.64	15th Wettest	Wettest since: 1973	1931
Sep–Dec 1977 4-Month	1.60	0.00	1.60	115th Driest	Driest since: 1976	1953
Sep–Dec 1977 4-Month	1.60	0.00	1.60	16th Wettest	Wettest since: 1973	1931, 1941
Aug–Dec 1977 5-Month	2.51	-0.02	2.53	128th Driest	Driest since: 1976	1953
Aug–Dec 1977 5-Month	2.51	-0.02	2.53	3rd Wettest	Wettest since: 1931	1902
Jul–Dec 1977 6-Month	1.65	0.01	1.64	114th Driest	Driest since: 1976	1953
Jul–Dec 1977 6-Month	1.65	0.01	1.64	17th Wettest	Wettest since: 1973	1902
Jun–Dec 1977 7-Month	0.91	0.02	0.89	102nd Driest	Driest since: 1976	1953
Jun–Dec 1977 7-Month	0.91	0.02	0.89	29th Wettest	Wettest since: 1973	1902
May–Dec 1977 8-Month	0.45	0.04	0.41	79th Driest	Driest since: 1976	1953
May–Dec 1977 8-Month	0.45	0.04	0.41	52nd Wettest	Wettest since: 1973	1902
Apr–Dec 1977 9-Month	0.20	0.05	0.15	67th Driest	Driest since: 1976	1988
Apr–Dec 1977 9-Month	0.20	0.05	0.15	64th Wettest	Wettest since: 1974	2008
Mar–Dec 1977 10-Month	0.25	0.03	0.22	75th Driest	Driest since: 1976	1934
Mar–Dec 1977 10-Month	0.25	0.03	0.22	56th Wettest	Wettest since: 1974	1993
Feb–Dec 1977 11-Month	0.05	0.04	0.01	66th Driest	Driest since: 1976	1934
Feb–Dec 1977 11-Month	0.05	0.04	0.01	65th Wettest	Wettest since: 1974	2008
Jan–Dec 1977 12-Month	-0.11	0.04	-0.15	52nd Driest	Driest since: 1976	1956
Jan–Dec 1977 12-Month	-0.11	0.04	-0.15	79th Wettest	Wettest since: 1974	1993
Jul 1976–Dec 1977 18-Month	-0.53	0.04	-0.57	32nd Driest	Driest since: 1968	1956
Jul 1976–Dec 1977 18-Month	-0.53	0.04	-0.57	98th Wettest	Wettest since: 1976	1993
Jan 1976–Dec 1977 24-Month	-0.19	0.04	-0.23	41st Driest	Driest since: 1976	1934
	-0.19	0.04	-0.23	89th Wettest	Wettest since: 1975	2009
	Ties: 1910
Jan 1975–Dec 1977 36-Month	-0.18	0.04	-0.22	36th Driest	Driest since: 1968	1956
Jan 1975–Dec 1977 36-Month	-0.18	0.04	-0.22	93rd Wettest	Wettest since: 1976	2010
Jan 1974–Dec 1977 48-Month	-0.05	0.04	-0.09	46th Driest	Driest since: 1969	1956
Jan 1974–Dec 1977 48-Month	-0.05	0.04	-0.09	82nd Wettest	Wettest since: 1976	2010
Jan 1973–Dec 1977 60-Month	0.37	0.04	0.33	92nd Driest	Driest since: 1972	1957
Jan 1973–Dec 1977 60-Month	0.37	0.04	0.33	35th Wettest	Wettest since: 1976	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 1977 Palmer Z-Index Rankings

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