National Rankings

National Data Info
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 2011

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  • Record Wettest
PeriodValue1901-2000
Mean		AnomalyRank
(1895-2022)		Wettest/Driest
Since		Record
December 2011
1-Month		2.26"
(57.40mm)		2.35"
(59.69mm)		-0.09"
(-2.29mm)		55th Driest
Driest since:
1930
74th Wettest
Wettest since:
2015
Nov–Dec 2011
2-Month		4.73"
(120.14mm)		4.58"
(116.33mm)		0.15"
(3.81mm)		75th Driest
Driest since:
1976
54th Wettest
Wettest since:
2015
Ties: 1915
Oct–Dec 2011
3-Month		6.87"
(174.50mm)		6.74"
(171.20mm)		0.13"
(3.30mm)		67th Driest
Driest since:
1917
62nd Wettest
Wettest since:
2015
Sep–Dec 2011
4-Month		9.35"
(237.49mm)		9.23"
(234.44mm)		0.12"
(3.05mm)		62nd Driest
Driest since:
1939
67th Wettest
Wettest since:
2018
Ties: 1915, 1975
Aug–Dec 2011
5-Month		11.69"
(296.93mm)		11.85"
(300.99mm)		-0.16"
(-4.06mm)		52nd Driest
Driest since:
1917
77th Wettest
Wettest since:
2018
Jul–Dec 2011
6-Month		14.13"
(358.90mm)		14.62"
(371.35mm)		-0.49"
(-12.45mm)		40th Driest
Driest since:
1917
89th Wettest
Wettest since:
2018
Jun–Dec 2011
7-Month		16.71"
(424.43mm)		17.55"
(445.77mm)		-0.84"
(-21.34mm)		35th Driest
Driest since:
1917
94th Wettest
Wettest since:
2018
May–Dec 2011
8-Month		20.14"
(511.56mm)		20.46"
(519.68mm)		-0.32"
(-8.12mm)		47th Driest
Driest since:
1917
82nd Wettest
Wettest since:
2015
Apr–Dec 2011
9-Month		23.56"
(598.42mm)		22.98"
(583.69mm)		0.58"
(14.73mm)		71st Driest
Driest since:
1956
58th Wettest
Wettest since:
2015
Mar–Dec 2011
10-Month		26.47"
(672.34mm)		25.49"
(647.45mm)		0.98"
(24.89mm)		80th Driest
Driest since:
1956
49th Wettest
Wettest since:
2015
Feb–Dec 2011
11-Month		28.45"
(722.63mm)		27.62"
(701.55mm)		0.83"
(21.08mm)		76th Driest
Driest since:
1910
53rd Wettest
Wettest since:
2018
Ties: 1909
Jan–Dec 2011
12-Month		30.10"
(764.54mm)		29.94"
(760.48mm)		0.16"
(4.06mm)		60th Driest
Driest since:
1910
69th Wettest
Wettest since:
1973
Jul 2010–Dec 2011
18-Month		45.35"
(1,151.89mm)		44.58"
(1,132.33mm)		0.77"
(19.56mm)		74th Driest
Driest since:
1954
54th Wettest
Wettest since:
2019
Jan 2010–Dec 2011
24-Month		61.47"
(1,561.34mm)		59.90"
(1,521.46mm)		1.57"
(39.88mm)		85th Driest
Driest since:
1931
43rd Wettest
Wettest since:
2019
Jan 2009–Dec 2011
36-Month		93.77"
(2,381.76mm)		89.86"
(2,282.44mm)		3.91"
(99.32mm)		99th Driest
Driest since:
1956
28th Wettest
Wettest since:
2019
Jan 2008–Dec 2011
48-Month		125.01"
(3,175.25mm)		119.78"
(3,042.41mm)		5.23"
(132.84mm)		104th Driest
Driest since:
1956
22nd Wettest
Wettest since:
2019
Jan 2007–Dec 2011
60-Month		154.19"
(3,916.43mm)		149.68"
(3,801.87mm)		4.51"
(114.56mm)		93rd Driest
Driest since:
1956
32nd Wettest
Wettest since:
2019

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