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.

Illinois, Climate Division 3

December 1938 Palmer Z-Index Rankings

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Record Wettest
Period	Value	1901-2000 Mean	Anomaly	Rank (1895-2025)	Driest/Wettest Since	Record
December 1938 1-Month	-0.88	-0.21	-0.67	43rd Driest	Driest since: 1937	1963
December 1938 1-Month	-0.88	-0.21	-0.67	88th Wettest	Wettest since: 1936	1982
Nov–Dec 1938 2-Month	-0.57	-0.11	-0.46	56th Driest	Driest since: 1937	1953
Nov–Dec 1938 2-Month	-0.57	-0.11	-0.46	75th Wettest	Wettest since: 1935	1985
Oct–Dec 1938 3-Month	-1.11	-0.12	-0.99	33rd Driest	Driest since: 1937	1953
Oct–Dec 1938 3-Month	-1.11	-0.12	-0.99	98th Wettest	Wettest since: 1936	1985
Sep–Dec 1938 4-Month	-1.22	-0.04	-1.18	30th Driest	Driest since: 1937	1953
	-1.22	-0.04	-1.18	101st Wettest	Wettest since: 1936	1941
	Ties: 1914
Aug–Dec 1938 5-Month	-1.02	-0.05	-0.97	31st Driest	Driest since: 1937	1901, 1953
Aug–Dec 1938 5-Month	-1.02	-0.05	-0.97	100th Wettest	Wettest since: 1936	1970
Jul–Dec 1938 6-Month	-0.84	-0.04	-0.80	38th Driest	Driest since: 1937	1901, 1953
Jul–Dec 1938 6-Month	-0.84	-0.04	-0.80	93rd Wettest	Wettest since: 1935	1961
Jun–Dec 1938 7-Month	-0.59	-0.02	-0.57	47th Driest	Driest since: 1937	1953
Jun–Dec 1938 7-Month	-0.59	-0.02	-0.57	84th Wettest	Wettest since: 1935	1993
May–Dec 1938 8-Month	-0.32	-0.01	-0.31	51st Driest	Driest since: 1937	1901
May–Dec 1938 8-Month	-0.32	-0.01	-0.31	80th Wettest	Wettest since: 1935	1993
Apr–Dec 1938 9-Month	-0.26	-0.01	-0.25	47th Driest	Driest since: 1937	1901
Apr–Dec 1938 9-Month	-0.26	-0.01	-0.25	84th Wettest	Wettest since: 1935	2009
Mar–Dec 1938 10-Month	-0.09	-0.03	-0.06	59th Driest	Driest since: 1937	1914
	-0.09	-0.03	-0.06	72nd Wettest	Wettest since: 1935	2009
	Ties: 1895
Feb–Dec 1938 11-Month	-0.01	-0.02	0.01	65th Driest	Driest since: 1937	1914
Feb–Dec 1938 11-Month	-0.01	-0.02	0.01	66th Wettest	Wettest since: 1935	2009
Jan–Dec 1938 12-Month	0.16	-0.02	0.18	76th Driest	Driest since: 1937	1914
Jan–Dec 1938 12-Month	0.16	-0.02	0.18	55th Wettest	Wettest since: 1935	2009
Jul 1937–Dec 1938 18-Month	-0.24	-0.03	-0.21	41st Driest	Driest since: 1937	1914
Jul 1937–Dec 1938 18-Month	-0.24	-0.03	-0.21	89th Wettest	Wettest since: 1935	1993
Jan 1937–Dec 1938 24-Month	-0.20	-0.02	-0.18	44th Driest	Driest since: 1937	1914
Jan 1937–Dec 1938 24-Month	-0.20	-0.02	-0.18	86th Wettest	Wettest since: 1936	2009, 2010
Jan 1936–Dec 1938 36-Month	-0.54	-0.02	-0.52	21st Driest	Driest since: 1936	1989
	-0.54	-0.02	-0.52	108th Wettest	Wettest since: 1937	2010
	Ties: 1921
Jan 1935–Dec 1938 48-Month	-0.18	-0.02	-0.16	42nd Driest	Driest since: 1937	1914
Jan 1935–Dec 1938 48-Month	-0.18	-0.02	-0.16	86th Wettest	Wettest since: 1932	2011
Jan 1934–Dec 1938 60-Month	-0.48	-0.02	-0.46	14th Driest	Driest since: 1937	1914
Jan 1934–Dec 1938 60-Month	-0.48	-0.02	-0.46	113th Wettest	Wettest since: 1936	1985

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

Illinois, Climate Division 3

December 1938 Palmer Z-Index Rankings

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