Statewide Rankings

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Please note, Degree Days and Palmer Indices are not available for Alaska. 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

Precipitation Rankings, December 1939

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Record Driest
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Record Wettest
Period	Value	1901-2000 Mean	Anomaly	Rank (1895-2022)	Wettest/Driest Since	Record
December 1939 1-Month	0.60" (15.24mm)	1.11" (28.19mm)	-0.51" (-12.95mm)	27th Driest	Driest since: 1934	2002
December 1939 1-Month	0.60" (15.24mm)	1.11" (28.19mm)	-0.51" (-12.95mm)	102nd Wettest	Wettest since: 1938	2015
Nov–Dec 1939 2-Month	1.09" (27.69mm)	2.87" (72.90mm)	-1.78" (-45.21mm)	11th Driest	Driest since: 1917	1976
Nov–Dec 1939 2-Month	1.09" (27.69mm)	2.87" (72.90mm)	-1.78" (-45.21mm)	118th Wettest	Wettest since: 1938	2015
Oct–Dec 1939 3-Month	2.57" (65.28mm)	5.16" (131.06mm)	-2.59" (-65.78mm)	8th Driest	Driest since: 1917	1910
Oct–Dec 1939 3-Month	2.57" (65.28mm)	5.16" (131.06mm)	-2.59" (-65.78mm)	121st Wettest	Wettest since: 1938	1931
Sep–Dec 1939 4-Month	3.41" (86.61mm)	8.83" (224.28mm)	-5.42" (-137.67mm)	1st Driest	Driest to Date	1939, 1976
	3.41" (86.61mm)	8.83" (224.28mm)	-5.42" (-137.67mm)	128th Wettest	Wettest since: 1938	1931
	Ties: 1976
Aug–Dec 1939 5-Month	8.08" (205.23mm)	12.67" (321.82mm)	-4.59" (-116.59mm)	9th Driest	Driest since: 1917	1976
Aug–Dec 1939 5-Month	8.08" (205.23mm)	12.67" (321.82mm)	-4.59" (-116.59mm)	120th Wettest	Wettest since: 1938	2018
Jul–Dec 1939 6-Month	11.28" (286.51mm)	16.52" (419.61mm)	-5.24" (-133.10mm)	11th Driest	Driest since: 1930	1976
Jul–Dec 1939 6-Month	11.28" (286.51mm)	16.52" (419.61mm)	-5.24" (-133.10mm)	118th Wettest	Wettest since: 1938	2018
Jun–Dec 1939 7-Month	16.20" (411.48mm)	21.15" (537.21mm)	-4.95" (-125.73mm)	13th Driest	Driest since: 1937	1976
Jun–Dec 1939 7-Month	16.20" (411.48mm)	21.15" (537.21mm)	-4.95" (-125.73mm)	116th Wettest	Wettest since: 1938	2018
May–Dec 1939 8-Month	18.24" (463.30mm)	25.20" (640.08mm)	-6.96" (-176.78mm)	8th Driest	Driest since: 1910	1976
May–Dec 1939 8-Month	18.24" (463.30mm)	25.20" (640.08mm)	-6.96" (-176.78mm)	121st Wettest	Wettest since: 1938	1993
Apr–Dec 1939 9-Month	20.24" (514.10mm)	28.15" (715.01mm)	-7.91" (-200.91mm)	7th Driest	Driest since: 1933	1910
Apr–Dec 1939 9-Month	20.24" (514.10mm)	28.15" (715.01mm)	-7.91" (-200.91mm)	122nd Wettest	Wettest since: 1938	1993
Mar–Dec 1939 10-Month	21.87" (555.50mm)	30.10" (764.54mm)	-8.23" (-209.04mm)	4th Driest	Driest since: 1910	1910
Mar–Dec 1939 10-Month	21.87" (555.50mm)	30.10" (764.54mm)	-8.23" (-209.04mm)	125th Wettest	Wettest since: 1938	1993
Feb–Dec 1939 11-Month	23.64" (600.46mm)	31.12" (790.45mm)	-7.48" (-189.99mm)	6th Driest	Driest since: 1933	1910
Feb–Dec 1939 11-Month	23.64" (600.46mm)	31.12" (790.45mm)	-7.48" (-189.99mm)	123rd Wettest	Wettest since: 1938	1993
Jan–Dec 1939 12-Month	24.50" (622.30mm)	32.09" (815.09mm)	-7.59" (-192.79mm)	6th Driest	Driest since: 1933	1910
	24.50" (622.30mm)	32.09" (815.09mm)	-7.59" (-192.79mm)	123rd Wettest	Wettest since: 1938	1993
	Ties: 1901, 1933
Jul 1938–Dec 1939 18-Month	42.76" (1,086.10mm)	48.69" (1,236.73mm)	-5.93" (-150.63mm)	24th Driest	Driest since: 1937	1956
Jul 1938–Dec 1939 18-Month	42.76" (1,086.10mm)	48.69" (1,236.73mm)	-5.93" (-150.63mm)	104th Wettest	Wettest since: 1938	1993
Jan 1938–Dec 1939 24-Month	60.82" (1,544.83mm)	64.24" (1,631.70mm)	-3.42" (-86.87mm)	42nd Driest	Driest since: 1937	1989
Jan 1938–Dec 1939 24-Month	60.82" (1,544.83mm)	64.24" (1,631.70mm)	-3.42" (-86.87mm)	86th Wettest	Wettest since: 1938	2019
Jan 1937–Dec 1939 36-Month	88.32" (2,243.33mm)	96.36" (2,447.54mm)	-8.04" (-204.21mm)	17th Driest	Driest since: 1937	1957
Jan 1937–Dec 1939 36-Month	88.32" (2,243.33mm)	96.36" (2,447.54mm)	-8.04" (-204.21mm)	110th Wettest	Wettest since: 1938	2010
Jan 1936–Dec 1939 48-Month	113.86" (2,892.04mm)	128.37" (3,260.60mm)	-14.51" (-368.56mm)	8th Driest	Driest since: 1937	1958
Jan 1936–Dec 1939 48-Month	113.86" (2,892.04mm)	128.37" (3,260.60mm)	-14.51" (-368.56mm)	118th Wettest	Wettest since: 1938	2010
Jan 1935–Dec 1939 60-Month	146.39" (3,718.31mm)	160.36" (4,073.14mm)	-13.97" (-354.83mm)	12th Driest	Driest since: 1937	1956
Jan 1935–Dec 1939 60-Month	146.39" (3,718.31mm)	160.36" (4,073.14mm)	-13.97" (-354.83mm)	113th Wettest	Wettest since: 1938	2010

Citing This Page

NOAA National Centers for Environmental information, Climate at a Glance: Statewide Rankings, published March 2023, retrieved on March 31, 2023 from https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/statewide/rankings