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, March 2018

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  • Record Wettest
Period Value 1901-2000
Mean
Anomaly Rank
(1895-2022)
Wettest/Driest
Since
Record
March 2018
1-Month
2.48"
(62.99mm)
2.51"
(63.75mm)
-0.03"
(-0.76mm)
69th Driest
Driest since:
1910
60th Wettest
Wettest since:
1973
Ties: 1917, 1985, 2003
Feb–Mar 2018
2-Month
5.37"
(136.40mm)
4.64"
(117.86mm)
0.73"
(18.54mm)
111th Driest
Driest since:
1910
18th Wettest
Wettest since:
1998
Jan–Mar 2018
3-Month
7.22"
(183.39mm)
6.96"
(176.78mm)
0.26"
(6.61mm)
84th Driest
Driest since:
1910
45th Wettest
Wettest since:
1998
Dec 2017–Mar 2018
4-Month
8.81"
(223.77mm)
9.30"
(236.22mm)
-0.49"
(-12.45mm)
44th Driest
Driest since:
1981
84th Wettest
Wettest since:
1983, 1998
Ties: 2004
Nov 2017–Mar 2018
5-Month
10.43"
(264.92mm)
11.53"
(292.86mm)
-1.10"
(-27.94mm)
20th Driest
Driest since:
1977
108th Wettest
Wettest since:
1983
Oct 2017–Mar 2018
6-Month
13.03"
(330.96mm)
13.70"
(347.98mm)
-0.67"
(-17.02mm)
39th Driest
Driest since:
1918
89th Wettest
Wettest since:
1983
Ties: 1936
Sep 2017–Mar 2018
7-Month
15.30"
(388.62mm)
16.19"
(411.23mm)
-0.89"
(-22.61mm)
37th Driest
Driest since:
1918
91st Wettest
Wettest since:
2019
Aug 2017–Mar 2018
8-Month
18.72"
(475.49mm)
18.82"
(478.03mm)
-0.10"
(-2.54mm)
62nd Driest
Driest since:
1918
66th Wettest
Wettest since:
2019
Jul 2017–Mar 2018
9-Month
21.52"
(546.61mm)
21.60"
(548.64mm)
-0.08"
(-2.03mm)
61st Driest
Driest since:
1918
67th Wettest
Wettest since:
2019
Jun 2017–Mar 2018
10-Month
24.59"
(624.59mm)
24.53"
(623.06mm)
0.06"
(1.53mm)
57th Driest
Driest since:
1918
71st Wettest
Wettest since:
2019
May 2017–Mar 2018
11-Month
27.95"
(709.93mm)
27.43"
(696.72mm)
0.52"
(13.21mm)
72nd Driest
Driest since:
1918
56th Wettest
Wettest since:
2019
Apr 2017–Mar 2018
12-Month
31.45"
(798.83mm)
29.96"
(760.98mm)
1.49"
(37.85mm)
95th Driest
Driest since:
1918
33rd Wettest
Wettest since:
2016
Oct 2016–Mar 2018
18-Month
46.39"
(1,178.31mm)
43.68"
(1,109.47mm)
2.71"
(68.84mm)
101st Driest
Driest since:
1918
26th Wettest
Wettest since:
2020
Apr 2016–Mar 2018
24-Month
64.06"
(1,627.12mm)
59.92"
(1,521.97mm)
4.14"
(105.15mm)
110th Driest
Driest since:
1955
17th Wettest
Wettest since:
2020
Ties: 1959
Apr 2015–Mar 2018
36-Month
99.84"
(2,535.94mm)
89.87"
(2,282.70mm)
9.97"
(253.24mm)
123rd Driest
Driest since:
1955
3rd Wettest
Wettest since:
2020
Apr 2014–Mar 2018
48-Month
130.40"
(3,312.16mm)
119.76"
(3,041.90mm)
10.64"
(270.26mm)
118th Driest
Driest since:
1957
7th Wettest
Wettest since:
2019
Apr 2013–Mar 2018
60-Month
161.34"
(4,098.04mm)
149.62"
(3,800.35mm)
11.72"
(297.69mm)
117th Driest
Driest since:
1957
7th Wettest
Wettest since:
2020

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