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 1966

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  • Record Driest
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  • Record Wettest
Period Value 1901-2000
Mean
Anomaly Rank
(1895-2022)
Wettest/Driest
Since
Record
May 1966
1-Month
2.24"
(56.90mm)
2.91"
(73.91mm)
-0.67"
(-17.01mm)
9th Driest
Driest since:
1934
120th Wettest
Wettest since:
2019
Apr–May 1966
2-Month
4.73"
(120.14mm)
5.43"
(137.92mm)
-0.70"
(-17.78mm)
21st Driest
Driest since:
1934
108th Wettest
Wettest since:
1957
Ties: 2012
Mar–May 1966
3-Month
6.34"
(161.04mm)
7.94"
(201.68mm)
-1.60"
(-40.64mm)
4th Driest
Driest since:
1925
125th Wettest
Wettest since:
1957, 1991
Feb–May 1966
4-Month
8.68"
(220.47mm)
10.07"
(255.78mm)
-1.39"
(-35.31mm)
9th Driest
Driest since:
1925
120th Wettest
Wettest since:
2019
Jan–May 1966
5-Month
11.04"
(280.42mm)
12.39"
(314.71mm)
-1.35"
(-34.29mm)
12th Driest
Driest since:
1934
117th Wettest
Wettest since:
2019
Dec 1965–May 1966
6-Month
13.20"
(335.28mm)
14.73"
(374.14mm)
-1.53"
(-38.86mm)
15th Driest
Driest since:
1931
113th Wettest
Wettest since:
2019
Nov 1965–May 1966
7-Month
15.20"
(386.08mm)
16.96"
(430.78mm)
-1.76"
(-44.70mm)
13th Driest
Driest since:
1934
115th Wettest
Wettest since:
1983
Oct 1965–May 1966
8-Month
16.65"
(422.91mm)
19.13"
(485.90mm)
-2.48"
(-62.99mm)
11th Driest
Driest since:
1934
117th Wettest
Wettest since:
2019
Sep 1965–May 1966
9-Month
20.18"
(512.57mm)
21.62"
(549.15mm)
-1.44"
(-36.58mm)
28th Driest
Driest since:
1934
100th Wettest
Wettest since:
2019
Aug 1965–May 1966
10-Month
22.98"
(583.69mm)
24.25"
(615.95mm)
-1.27"
(-32.26mm)
35th Driest
Driest since:
1918
93rd Wettest
Wettest since:
2019
Jul 1965–May 1966
11-Month
25.71"
(653.03mm)
27.03"
(686.56mm)
-1.32"
(-33.53mm)
33rd Driest
Driest since:
1931
95th Wettest
Wettest since:
2019
Jun 1965–May 1966
12-Month
28.95"
(735.33mm)
29.95"
(760.73mm)
-1.00"
(-25.40mm)
40th Driest
Driest since:
1934
88th Wettest
Wettest since:
2019
Dec 1964–May 1966
18-Month
44.17"
(1,121.92mm)
44.70"
(1,135.38mm)
-0.53"
(-13.46mm)
53rd Driest
Driest since:
1931
74th Wettest
Wettest since:
2019
Jun 1964–May 1966
24-Month
58.74"
(1,492.00mm)
59.92"
(1,521.97mm)
-1.18"
(-29.97mm)
41st Driest
Driest since:
1931
86th Wettest
Wettest since:
2020
Jun 1963–May 1966
36-Month
86.37"
(2,193.80mm)
89.88"
(2,282.95mm)
-3.51"
(-89.15mm)
24th Driest
Driest since:
1955
102nd Wettest
Wettest since:
2019
Jun 1962–May 1966
48-Month
113.70"
(2,887.98mm)
119.78"
(3,042.41mm)
-6.08"
(-154.43mm)
9th Driest
Driest since:
1956
116th Wettest
Wettest since:
2019
Jun 1961–May 1966
60-Month
144.05"
(3,658.87mm)
149.64"
(3,800.86mm)
-5.59"
(-141.99mm)
16th Driest
Driest since:
1957
108th Wettest
Wettest since:
2020

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