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, May 1998

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  • Record Wettest
Period Value 1901-2000
Mean
Anomaly Rank
(1895-2022)
Wettest/Driest
Since
Record
May 1998
1-Month
2.62"
(66.55mm)
2.91"
(73.91mm)
-0.29"
(-7.36mm)
34th Driest
Driest since:
1934
95th Wettest
Wettest since:
2019
Apr–May 1998
2-Month
5.19"
(131.83mm)
5.43"
(137.92mm)
-0.24"
(-6.09mm)
45th Driest
Driest since:
1934
84th Wettest
Wettest since:
1957
Ties: 1901, 1986
Mar–May 1998
3-Month
8.42"
(213.87mm)
7.94"
(201.68mm)
0.48"
(12.19mm)
93rd Driest
Driest since:
1925
36th Wettest
Wettest since:
1957, 1991
Feb–May 1998
4-Month
11.74"
(298.20mm)
10.07"
(255.78mm)
1.67"
(42.42mm)
117th Driest
Driest since:
1925
12th Wettest
Wettest since:
2019
Ties: 2011
Jan–May 1998
5-Month
15.10"
(383.54mm)
12.39"
(314.71mm)
2.71"
(68.83mm)
126th Driest
Driest since:
1934
3rd Wettest
Wettest since:
2019
Dec 1997–May 1998
6-Month
17.41"
(442.21mm)
14.73"
(374.14mm)
2.68"
(68.07mm)
122nd Driest
Driest since:
1931
6th Wettest
Wettest since:
2019
Nov 1997–May 1998
7-Month
19.70"
(500.38mm)
16.96"
(430.78mm)
2.74"
(69.60mm)
120th Driest
Driest since:
1934
8th Wettest
Wettest since:
1983
Ties: 1997
Oct 1997–May 1998
8-Month
22.22"
(564.39mm)
19.13"
(485.90mm)
3.09"
(78.49mm)
121st Driest
Driest since:
1934
7th Wettest
Wettest since:
2019
Sep 1997–May 1998
9-Month
24.76"
(628.90mm)
21.62"
(549.15mm)
3.14"
(79.75mm)
120th Driest
Driest since:
1934
8th Wettest
Wettest since:
2019
Aug 1997–May 1998
10-Month
27.44"
(696.98mm)
24.25"
(615.95mm)
3.19"
(81.03mm)
119th Driest
Driest since:
1918
9th Wettest
Wettest since:
2019
Jul 1997–May 1998
11-Month
30.15"
(765.81mm)
27.03"
(686.56mm)
3.12"
(79.25mm)
116th Driest
Driest since:
1931
12th Wettest
Wettest since:
2019
Jun 1997–May 1998
12-Month
33.55"
(852.17mm)
29.95"
(760.73mm)
3.60"
(91.44mm)
121st Driest
Driest since:
1934
7th Wettest
Wettest since:
2019
Dec 1996–May 1998
18-Month
50.25"
(1,276.35mm)
44.70"
(1,135.38mm)
5.55"
(140.97mm)
120th Driest
Driest since:
1931
7th Wettest
Wettest since:
2019
Jun 1996–May 1998
24-Month
67.83"
(1,722.88mm)
59.92"
(1,521.97mm)
7.91"
(200.91mm)
122nd Driest
Driest since:
1931
5th Wettest
Wettest since:
2020
Jun 1995–May 1998
36-Month
98.65"
(2,505.71mm)
89.88"
(2,282.95mm)
8.77"
(222.76mm)
117th Driest
Driest since:
1955
9th Wettest
Wettest since:
2019
Jun 1994–May 1998
48-Month
131.97"
(3,352.04mm)
119.78"
(3,042.41mm)
12.19"
(309.63mm)
122nd Driest
Driest since:
1956
3rd Wettest
Wettest to Date
2019
Jun 1993–May 1998
60-Month
162.50"
(4,127.50mm)
149.64"
(3,800.86mm)
12.86"
(326.64mm)
119th Driest
Driest since:
1957
5th Wettest
Wettest since:
2020

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