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 1971

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  • Record Wettest
Period Value 1901-2000
Mean
Anomaly Rank
(1895-2022)
Wettest/Driest
Since
Record
May 1971
1-Month
2.92"
(74.17mm)
2.91"
(73.91mm)
0.01"
(0.26mm)
62nd Driest
Driest since:
1934
67th Wettest
Wettest since:
2019
Ties: 1955
Apr–May 1971
2-Month
4.78"
(121.41mm)
5.43"
(137.92mm)
-0.65"
(-16.51mm)
23rd Driest
Driest since:
1934
106th Wettest
Wettest since:
1957
Mar–May 1971
3-Month
6.86"
(174.24mm)
7.94"
(201.68mm)
-1.08"
(-27.44mm)
12th Driest
Driest since:
1925
117th Wettest
Wettest since:
1957, 1991
Ties: 1895, 1992
Feb–May 1971
4-Month
9.23"
(234.44mm)
10.07"
(255.78mm)
-0.84"
(-21.34mm)
26th Driest
Driest since:
1925
103rd Wettest
Wettest since:
2019
Jan–May 1971
5-Month
11.26"
(286.00mm)
12.39"
(314.71mm)
-1.13"
(-28.71mm)
17th Driest
Driest since:
1934
112th Wettest
Wettest since:
2019
Ties: 1992
Dec 1970–May 1971
6-Month
13.48"
(342.39mm)
14.73"
(374.14mm)
-1.25"
(-31.75mm)
22nd Driest
Driest since:
1931
106th Wettest
Wettest since:
2019
Nov 1970–May 1971
7-Month
15.68"
(398.27mm)
16.96"
(430.78mm)
-1.28"
(-32.51mm)
30th Driest
Driest since:
1934
98th Wettest
Wettest since:
1983
Oct 1970–May 1971
8-Month
18.56"
(471.42mm)
19.13"
(485.90mm)
-0.57"
(-14.48mm)
45th Driest
Driest since:
1934
83rd Wettest
Wettest since:
2019
Sep 1970–May 1971
9-Month
21.62"
(549.15mm)
21.62"
(549.15mm)
0.00"
(0.00mm)
63rd Driest
Driest since:
1934
65th Wettest
Wettest since:
2019
Aug 1970–May 1971
10-Month
23.99"
(609.35mm)
24.25"
(615.95mm)
-0.26"
(-6.60mm)
58th Driest
Driest since:
1918
70th Wettest
Wettest since:
2019
Ties: 1961
Jul 1970–May 1971
11-Month
26.40"
(670.56mm)
27.03"
(686.56mm)
-0.63"
(-16.00mm)
41st Driest
Driest since:
1931
87th Wettest
Wettest since:
2019
Ties: 1957
Jun 1970–May 1971
12-Month
29.17"
(740.92mm)
29.95"
(760.73mm)
-0.78"
(-19.81mm)
42nd Driest
Driest since:
1934
86th Wettest
Wettest since:
2019
Dec 1969–May 1971
18-Month
43.90"
(1,115.06mm)
44.70"
(1,135.38mm)
-0.80"
(-20.32mm)
44th Driest
Driest since:
1931
83rd Wettest
Wettest since:
2019
Ties: 1986
Jun 1969–May 1971
24-Month
59.20"
(1,503.68mm)
59.92"
(1,521.97mm)
-0.72"
(-18.29mm)
52nd Driest
Driest since:
1931
75th Wettest
Wettest since:
2020
Jun 1968–May 1971
36-Month
90.38"
(2,295.65mm)
89.88"
(2,282.95mm)
0.50"
(12.70mm)
69th Driest
Driest since:
1955
57th Wettest
Wettest since:
2019
Ties: 1914
Jun 1967–May 1971
48-Month
120.46"
(3,059.68mm)
119.78"
(3,042.41mm)
0.68"
(17.27mm)
61st Driest
Driest since:
1956
64th Wettest
Wettest since:
2019
Jun 1966–May 1971
60-Month
148.00"
(3,759.20mm)
149.64"
(3,800.86mm)
-1.64"
(-41.66mm)
48th Driest
Driest since:
1957
76th Wettest
Wettest since:
2020

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