National Rankings

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Palmer Drought Severity Index (PDSI), Palmer Hydrological Drought Index (PHDI), and Palmer Modified Drought Index (PMDI) are not offered for multiple-month time scales.

Contiguous U.S.

Precipitation Rankings, December 1940

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Record Wettest
Period	Value	1901-2000 Mean	Anomaly	Rank (1895-2022)	Wettest/Driest Since	Record
December 1940 1-Month	2.84" (72.14mm)	2.35" (59.69mm)	0.49" (12.45mm)	105th Driest	Driest since: 1939	1930
	2.84" (72.14mm)	2.35" (59.69mm)	0.49" (12.45mm)	24th Wettest	Wettest since: 1932	2015
	Ties: 2008
Nov–Dec 1940 2-Month	5.75" (146.05mm)	4.58" (116.33mm)	1.17" (29.72mm)	117th Driest	Driest since: 1939	1976
Nov–Dec 1940 2-Month	5.75" (146.05mm)	4.58" (116.33mm)	1.17" (29.72mm)	12th Wettest	Wettest since: 1931	2015
Oct–Dec 1940 3-Month	7.52" (191.01mm)	6.74" (171.20mm)	0.78" (19.81mm)	95th Driest	Driest since: 1939	1917
	7.52" (191.01mm)	6.74" (171.20mm)	0.78" (19.81mm)	34th Wettest	Wettest since: 1931	2015
	Ties: 1948, 1981
Sep–Dec 1940 4-Month	9.52" (241.81mm)	9.23" (234.44mm)	0.29" (7.37mm)	74th Driest	Driest since: 1939	1939
	9.52" (241.81mm)	9.23" (234.44mm)	0.29" (7.37mm)	55th Wettest	Wettest since: 1932	2018
	Ties: 1929
Aug–Dec 1940 5-Month	12.49" (317.25mm)	11.85" (300.99mm)	0.64" (16.26mm)	83rd Driest	Driest since: 1939	1917
	12.49" (317.25mm)	11.85" (300.99mm)	0.64" (16.26mm)	46th Wettest	Wettest since: 1931	2018
	Ties: 1991
Jul–Dec 1940 6-Month	14.99" (380.75mm)	14.62" (371.35mm)	0.37" (9.40mm)	69th Driest	Driest since: 1939	1917
Jul–Dec 1940 6-Month	14.99" (380.75mm)	14.62" (371.35mm)	0.37" (9.40mm)	60th Wettest	Wettest since: 1932	2018
Jun–Dec 1940 7-Month	17.97" (456.44mm)	17.55" (445.77mm)	0.42" (10.67mm)	69th Driest	Driest since: 1939	1917
Jun–Dec 1940 7-Month	17.97" (456.44mm)	17.55" (445.77mm)	0.42" (10.67mm)	60th Wettest	Wettest since: 1932	2018
May–Dec 1940 8-Month	20.19" (512.83mm)	20.46" (519.68mm)	-0.27" (-6.85mm)	51st Driest	Driest since: 1939	1917
May–Dec 1940 8-Month	20.19" (512.83mm)	20.46" (519.68mm)	-0.27" (-6.85mm)	78th Wettest	Wettest since: 1932	2015
Apr–Dec 1940 9-Month	23.23" (590.04mm)	22.98" (583.69mm)	0.25" (6.35mm)	63rd Driest	Driest since: 1939	1956
Apr–Dec 1940 9-Month	23.23" (590.04mm)	22.98" (583.69mm)	0.25" (6.35mm)	66th Wettest	Wettest since: 1928	2015
Mar–Dec 1940 10-Month	25.50" (647.70mm)	25.49" (647.45mm)	0.01" (0.25mm)	59th Driest	Driest since: 1939	1956
Mar–Dec 1940 10-Month	25.50" (647.70mm)	25.49" (647.45mm)	0.01" (0.25mm)	70th Wettest	Wettest since: 1929	2015
Feb–Dec 1940 11-Month	28.48" (723.39mm)	27.62" (701.55mm)	0.86" (21.84mm)	77th Driest	Driest since: 1939	1910
Feb–Dec 1940 11-Month	28.48" (723.39mm)	27.62" (701.55mm)	0.86" (21.84mm)	52nd Wettest	Wettest since: 1927	2018
Jan–Dec 1940 12-Month	30.41" (772.41mm)	29.94" (760.48mm)	0.47" (11.93mm)	69th Driest	Driest since: 1939	1910
Jan–Dec 1940 12-Month	30.41" (772.41mm)	29.94" (760.48mm)	0.47" (11.93mm)	60th Wettest	Wettest since: 1937	1973
Jul 1939–Dec 1940 18-Month	41.57" (1,055.88mm)	44.58" (1,132.33mm)	-3.01" (-76.45mm)	19th Driest	Driest since: 1939	1954
Jul 1939–Dec 1940 18-Month	41.57" (1,055.88mm)	44.58" (1,132.33mm)	-3.01" (-76.45mm)	109th Wettest	Wettest since: 1938	2019
Jan 1939–Dec 1940 24-Month	56.74" (1,441.20mm)	59.90" (1,521.46mm)	-3.16" (-80.26mm)	20th Driest	Driest since: 1939	1931
Jan 1939–Dec 1940 24-Month	56.74" (1,441.20mm)	59.90" (1,521.46mm)	-3.16" (-80.26mm)	108th Wettest	Wettest since: 1938	2019
Jan 1938–Dec 1940 36-Month	86.48" (2,196.59mm)	89.86" (2,282.44mm)	-3.38" (-85.85mm)	26th Driest	Driest since: 1936	1956
Jan 1938–Dec 1940 36-Month	86.48" (2,196.59mm)	89.86" (2,282.44mm)	-3.38" (-85.85mm)	101st Wettest	Wettest since: 1939	2019
Jan 1937–Dec 1940 48-Month	116.99" (2,971.55mm)	119.78" (3,042.41mm)	-2.79" (-70.86mm)	37th Driest	Driest since: 1939	1956
Jan 1937–Dec 1940 48-Month	116.99" (2,971.55mm)	119.78" (3,042.41mm)	-2.79" (-70.86mm)	89th Wettest	Wettest since: 1938	2019
Jan 1936–Dec 1940 60-Month	144.27" (3,664.46mm)	149.68" (3,801.87mm)	-5.41" (-137.41mm)	18th Driest	Driest since: 1939	1956
Jan 1936–Dec 1940 60-Month	144.27" (3,664.46mm)	149.68" (3,801.87mm)	-5.41" (-137.41mm)	107th Wettest	Wettest since: 1931	2019

Citing This Page

NOAA National Centers for Environmental information, Climate at a Glance: National Rankings, published January 2023, retrieved on January 28, 2023 from https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/national/rankings