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 1987

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  • Record Wettest
Period Value 1901-2000
Mean
Anomaly Rank
(1895-2022)
Wettest/Driest
Since
Record
May 1987
1-Month
3.24"
(82.30mm)
2.91"
(73.91mm)
0.33"
(8.39mm)
97th Driest
Driest since:
1934
32nd Wettest
Wettest since:
2019
Ties: 1938
Apr–May 1987
2-Month
4.70"
(119.38mm)
5.43"
(137.92mm)
-0.73"
(-18.54mm)
18th Driest
Driest since:
1934
111th Wettest
Wettest since:
1957
Mar–May 1987
3-Month
7.37"
(187.20mm)
7.94"
(201.68mm)
-0.57"
(-14.48mm)
33rd Driest
Driest since:
1925
96th Wettest
Wettest since:
1957, 1991
Feb–May 1987
4-Month
9.70"
(246.38mm)
10.07"
(255.78mm)
-0.37"
(-9.40mm)
53rd Driest
Driest since:
1925
76th Wettest
Wettest since:
2019
Ties: 1970
Jan–May 1987
5-Month
11.87"
(301.50mm)
12.39"
(314.71mm)
-0.52"
(-13.21mm)
48th Driest
Driest since:
1934
81st Wettest
Wettest since:
2019
Dec 1986–May 1987
6-Month
13.87"
(352.30mm)
14.73"
(374.14mm)
-0.86"
(-21.84mm)
38th Driest
Driest since:
1931
90th Wettest
Wettest since:
2019
Ties: 1947, 2022
Nov 1986–May 1987
7-Month
16.81"
(426.97mm)
16.96"
(430.78mm)
-0.15"
(-3.81mm)
62nd Driest
Driest since:
1934
66th Wettest
Wettest since:
1983
Oct 1986–May 1987
8-Month
19.62"
(498.35mm)
19.13"
(485.90mm)
0.49"
(12.45mm)
77th Driest
Driest since:
1934
51st Wettest
Wettest since:
2019
Ties: 1946, 1986
Sep 1986–May 1987
9-Month
23.21"
(589.53mm)
21.62"
(549.15mm)
1.59"
(40.38mm)
104th Driest
Driest since:
1934
24th Wettest
Wettest since:
2019
Ties: 1919, 1999
Aug 1986–May 1987
10-Month
26.03"
(661.16mm)
24.25"
(615.95mm)
1.78"
(45.21mm)
103rd Driest
Driest since:
1918
25th Wettest
Wettest since:
2019
Jul 1986–May 1987
11-Month
28.78"
(731.01mm)
27.03"
(686.56mm)
1.75"
(44.45mm)
102nd Driest
Driest since:
1931
26th Wettest
Wettest since:
2019
Jun 1986–May 1987
12-Month
31.81"
(807.97mm)
29.95"
(760.73mm)
1.86"
(47.24mm)
98th Driest
Driest since:
1934
30th Wettest
Wettest since:
2019
Ties: 1999
Dec 1985–May 1987
18-Month
44.71"
(1,135.63mm)
44.70"
(1,135.38mm)
0.01"
(0.25mm)
62nd Driest
Driest since:
1931
65th Wettest
Wettest since:
2019
Jun 1985–May 1987
24-Month
62.70"
(1,592.58mm)
59.92"
(1,521.97mm)
2.78"
(70.61mm)
99th Driest
Driest since:
1931
28th Wettest
Wettest since:
2020
Jun 1984–May 1987
36-Month
92.31"
(2,344.67mm)
89.88"
(2,282.95mm)
2.43"
(61.72mm)
86th Driest
Driest since:
1955
40th Wettest
Wettest since:
2019
Jun 1983–May 1987
48-Month
124.25"
(3,155.95mm)
119.78"
(3,042.41mm)
4.47"
(113.54mm)
98th Driest
Driest since:
1956
27th Wettest
Wettest since:
2019
Jun 1982–May 1987
60-Month
159.72"
(4,056.89mm)
149.64"
(3,800.86mm)
10.08"
(256.03mm)
113th Driest
Driest since:
1957
11th Wettest
Wettest since:
2020

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