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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