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 1918

View Period (Months):
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  • Record Wettest
Period Value 1901-2000
Mean
Anomaly Rank
(1895-2022)
Wettest/Driest
Since
Record
May 1918
1-Month
2.59"
(65.79mm)
2.91"
(73.91mm)
-0.32"
(-8.12mm)
29th Driest
Driest since:
1934
100th Wettest
Wettest since:
2019
Ties: 1904, 1910
Apr–May 1918
2-Month
5.41"
(137.41mm)
5.43"
(137.92mm)
-0.02"
(-0.51mm)
68th Driest
Driest since:
1934
61st Wettest
Wettest since:
1957
Ties: 1946, 1955
Mar–May 1918
3-Month
7.26"
(184.40mm)
7.94"
(201.68mm)
-0.68"
(-17.28mm)
29th Driest
Driest since:
1925
100th Wettest
Wettest since:
1957, 1991
Feb–May 1918
4-Month
8.98"
(228.09mm)
10.07"
(255.78mm)
-1.09"
(-27.69mm)
19th Driest
Driest since:
1925
110th Wettest
Wettest since:
2019
Jan–May 1918
5-Month
11.39"
(289.31mm)
12.39"
(314.71mm)
-1.00"
(-25.40mm)
24th Driest
Driest since:
1934
105th Wettest
Wettest since:
2019
Dec 1917–May 1918
6-Month
13.05"
(331.47mm)
14.73"
(374.14mm)
-1.68"
(-42.67mm)
13th Driest
Driest since:
1931
115th Wettest
Wettest since:
2019
Nov 1917–May 1918
7-Month
14.00"
(355.60mm)
16.96"
(430.78mm)
-2.96"
(-75.18mm)
5th Driest
Driest since:
1934
123rd Wettest
Wettest since:
1983
Oct 1917–May 1918
8-Month
15.38"
(390.65mm)
19.13"
(485.90mm)
-3.75"
(-95.25mm)
3rd Driest
Driest since:
1934
125th Wettest
Wettest since:
2019
Sep 1917–May 1918
9-Month
17.55"
(445.77mm)
21.62"
(549.15mm)
-4.07"
(-103.38mm)
2nd Driest
Driest since:
1934
126th Wettest
Wettest since:
2019
Aug 1917–May 1918
10-Month
19.99"
(507.75mm)
24.25"
(615.95mm)
-4.26"
(-108.20mm)
1st Driest
Driest since:
1918
127th Wettest
Wettest since:
2019
Jul 1917–May 1918
11-Month
22.50"
(571.50mm)
27.03"
(686.56mm)
-4.53"
(-115.06mm)
2nd Driest
Driest since:
1931
126th Wettest
Wettest since:
2019
Jun 1917–May 1918
12-Month
24.94"
(633.48mm)
29.95"
(760.73mm)
-5.01"
(-127.25mm)
3rd Driest
Driest since:
1934
125th Wettest
Wettest since:
2019
Dec 1916–May 1918
18-Month
38.92"
(988.57mm)
44.70"
(1,135.38mm)
-5.78"
(-146.81mm)
3rd Driest
Driest since:
1931
124th Wettest
Wettest since:
2019
Jun 1916–May 1918
24-Month
53.50"
(1,358.90mm)
59.92"
(1,521.97mm)
-6.42"
(-163.07mm)
4th Driest
Driest since:
1931
123rd Wettest
Wettest since:
2020
Jun 1915–May 1918
36-Month
85.69"
(2,176.53mm)
89.88"
(2,282.95mm)
-4.19"
(-106.42mm)
19th Driest
Driest since:
1955
107th Wettest
Wettest since:
2019
Jun 1914–May 1918
48-Month
116.10"
(2,948.94mm)
119.78"
(3,042.41mm)
-3.68"
(-93.47mm)
29th Driest
Driest since:
1956
96th Wettest
Wettest since:
2019
Jun 1913–May 1918
60-Month
145.26"
(3,689.60mm)
149.64"
(3,800.86mm)
-4.38"
(-111.26mm)
28th Driest
Driest since:
1957
96th Wettest
Wettest since:
2020
Ties: 1939

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