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 2020

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  • Record Wettest
Period Value 1901-2000
Mean		 Anomaly Rank
(1895-2022)		 Wettest/Driest
Since		 Record
December 2020
1-Month 		2.05"
(52.07mm)		 2.35"
(59.69mm)		 -0.30"
(-7.62mm)		 37th Driest
Driest since:
 1930
92nd Wettest
Wettest since:
 2015
Nov–Dec 2020
2-Month 		3.99"
(101.35mm)		 4.58"
(116.33mm)		 -0.59"
(-14.98mm)		 31st Driest
Driest since:
 1976
98th Wettest
Wettest since:
 2015
Ties: 1924
Oct–Dec 2020
3-Month 		6.17"
(156.72mm)		 6.74"
(171.20mm)		 -0.57"
(-14.48mm)		 35th Driest
Driest since:
 1917
94th Wettest
Wettest since:
 2015
Sep–Dec 2020
4-Month 		8.61"
(218.69mm)		 9.23"
(234.44mm)		 -0.62"
(-15.75mm)		 36th Driest
Driest since:
 1939
93rd Wettest
Wettest since:
 2018
Aug–Dec 2020
5-Month 		11.03"
(280.16mm)		 11.85"
(300.99mm)		 -0.82"
(-20.83mm)		 31st Driest
Driest since:
 1917
98th Wettest
Wettest since:
 2018
Jul–Dec 2020
6-Month 		13.97"
(354.84mm)		 14.62"
(371.35mm)		 -0.65"
(-16.51mm)		 36th Driest
Driest since:
 1917
93rd Wettest
Wettest since:
 2018
Ties: 1955
Jun–Dec 2020
7-Month 		16.70"
(424.18mm)		 17.55"
(445.77mm)		 -0.85"
(-21.59mm)		 34th Driest
Driest since:
 1917
95th Wettest
Wettest since:
 2018
May–Dec 2020
8-Month 		19.79"
(502.67mm)		 20.46"
(519.68mm)		 -0.67"
(-17.01mm)		 39th Driest
Driest since:
 1917
90th Wettest
Wettest since:
 2015
Apr–Dec 2020
9-Month 		22.31"
(566.67mm)		 22.98"
(583.69mm)		 -0.67"
(-17.02mm)		 40th Driest
Driest since:
 1956
89th Wettest
Wettest since:
 2015
Mar–Dec 2020
10-Month 		25.17"
(639.32mm)		 25.49"
(647.45mm)		 -0.32"
(-8.13mm)		 46th Driest
Driest since:
 1956
83rd Wettest
Wettest since:
 2015
Ties: 1908
Feb–Dec 2020
11-Month 		27.62"
(701.55mm)		 27.62"
(701.55mm)		 0.00"
(0.00mm)		 60th Driest
Driest since:
 1910
69th Wettest
Wettest since:
 2018
Ties: 1969
Jan–Dec 2020
12-Month 		30.38"
(771.65mm)		 29.94"
(760.48mm)		 0.44"
(11.17mm)		 67th Driest
Driest since:
 1910
62nd Wettest
Wettest since:
 1973
Jul 2019–Dec 2020
18-Month 		46.07"
(1,170.18mm)		 44.58"
(1,132.33mm)		 1.49"
(37.85mm)		 85th Driest
Driest since:
 1954
43rd Wettest
Wettest since:
 2019
Jan 2019–Dec 2020
24-Month 		65.20"
(1,656.08mm)		 59.90"
(1,521.46mm)		 5.30"
(134.62mm)		 115th Driest
Driest since:
 1931
13th Wettest
Wettest since:
 2019
Jan 2018–Dec 2020
36-Month 		99.85"
(2,536.19mm)		 89.86"
(2,282.44mm)		 9.99"
(253.75mm)		 124th Driest
Driest since:
 1956
3rd Wettest
Wettest since:
 2019
Jan 2017–Dec 2020
48-Month 		132.16"
(3,356.86mm)		 119.78"
(3,042.41mm)		 12.38"
(314.45mm)		 123rd Driest
Driest since:
 1956
3rd Wettest
Wettest since:
 2019
Jan 2016–Dec 2020
60-Month 		163.58"
(4,154.93mm)		 149.68"
(3,801.87mm)		 13.90"
(353.06mm)		 122nd Driest
Driest since:
 1956
3rd Wettest
Wettest since:
 2019

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