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 2017

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  • Record Wettest
Period Value 1901-2000
Mean
Anomaly Rank
(1895-2022)
Wettest/Driest
Since
Record
December 2017
1-Month
1.59"
(40.39mm)
2.35"
(59.69mm)
-0.76"
(-19.30mm)
11th Driest
Driest since:
1930
118th Wettest
Wettest since:
2015
Nov–Dec 2017
2-Month
3.21"
(81.53mm)
4.58"
(116.33mm)
-1.37"
(-34.80mm)
8th Driest
Driest since:
1976
121st Wettest
Wettest since:
2015
Oct–Dec 2017
3-Month
5.81"
(147.57mm)
6.74"
(171.20mm)
-0.93"
(-23.63mm)
25th Driest
Driest since:
1917
104th Wettest
Wettest since:
2015
Sep–Dec 2017
4-Month
8.08"
(205.23mm)
9.23"
(234.44mm)
-1.15"
(-29.21mm)
24th Driest
Driest since:
1939
105th Wettest
Wettest since:
2018
Aug–Dec 2017
5-Month
11.50"
(292.10mm)
11.85"
(300.99mm)
-0.35"
(-8.89mm)
44th Driest
Driest since:
1917
85th Wettest
Wettest since:
2018
Ties: 1896, 1987
Jul–Dec 2017
6-Month
14.30"
(363.22mm)
14.62"
(371.35mm)
-0.32"
(-8.13mm)
45th Driest
Driest since:
1917
84th Wettest
Wettest since:
2018
Ties: 1912
Jun–Dec 2017
7-Month
17.37"
(441.20mm)
17.55"
(445.77mm)
-0.18"
(-4.57mm)
51st Driest
Driest since:
1917
78th Wettest
Wettest since:
2018
May–Dec 2017
8-Month
20.73"
(526.54mm)
20.46"
(519.68mm)
0.27"
(6.86mm)
69th Driest
Driest since:
1917
60th Wettest
Wettest since:
2015
Apr–Dec 2017
9-Month
24.23"
(615.44mm)
22.98"
(583.69mm)
1.25"
(31.75mm)
93rd Driest
Driest since:
1956
36th Wettest
Wettest since:
2015
Mar–Dec 2017
10-Month
26.82"
(681.23mm)
25.49"
(647.45mm)
1.33"
(33.78mm)
94th Driest
Driest since:
1956
35th Wettest
Wettest since:
2015
Feb–Dec 2017
11-Month
29.07"
(738.38mm)
27.62"
(701.55mm)
1.45"
(36.83mm)
92nd Driest
Driest since:
1910
37th Wettest
Wettest since:
2018
Jan–Dec 2017
12-Month
32.31"
(820.67mm)
29.94"
(760.48mm)
2.37"
(60.19mm)
108th Driest
Driest since:
1910
21st Wettest
Wettest since:
1973
Jul 2016–Dec 2017
18-Month
48.29"
(1,226.57mm)
44.58"
(1,132.33mm)
3.71"
(94.24mm)
112th Driest
Driest since:
1954
16th Wettest
Wettest since:
2019
Jan 2016–Dec 2017
24-Month
63.73"
(1,618.74mm)
59.90"
(1,521.46mm)
3.83"
(97.28mm)
106th Driest
Driest since:
1931
22nd Wettest
Wettest since:
2019
Jan 2015–Dec 2017
36-Month
98.32"
(2,497.33mm)
89.86"
(2,282.44mm)
8.46"
(214.89mm)
119th Driest
Driest since:
1956
8th Wettest
Wettest since:
2019
Jan 2014–Dec 2017
48-Month
129.17"
(3,280.92mm)
119.78"
(3,042.41mm)
9.39"
(238.51mm)
116th Driest
Driest since:
1956
10th Wettest
Wettest since:
2019
Jan 2013–Dec 2017
60-Month
160.23"
(4,069.84mm)
149.68"
(3,801.87mm)
10.55"
(267.97mm)
114th Driest
Driest since:
1956
11th Wettest
Wettest since:
2019

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