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 1917

View Period (Months):
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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 1917
1-Month
2.64"
(67.06mm)
2.91"
(73.91mm)
-0.27"
(-6.85mm)
35th Driest
Driest since:
1934
94th Wettest
Wettest since:
2019
Ties: 2002
Apr–May 1917
2-Month
5.32"
(135.13mm)
5.43"
(137.92mm)
-0.11"
(-2.79mm)
60th Driest
Driest since:
1934
69th Wettest
Wettest since:
1957
Ties: 1909
Mar–May 1917
3-Month
7.80"
(198.12mm)
7.94"
(201.68mm)
-0.14"
(-3.56mm)
58th Driest
Driest since:
1925
71st Wettest
Wettest since:
1957, 1991
Feb–May 1917
4-Month
9.61"
(244.09mm)
10.07"
(255.78mm)
-0.46"
(-11.69mm)
44th Driest
Driest since:
1925
85th Wettest
Wettest since:
2019
Ties: 1901, 1955
Jan–May 1917
5-Month
11.80"
(299.72mm)
12.39"
(314.71mm)
-0.59"
(-14.99mm)
45th Driest
Driest since:
1934
84th Wettest
Wettest since:
2019
Dec 1916–May 1917
6-Month
13.98"
(355.09mm)
14.73"
(374.14mm)
-0.75"
(-19.05mm)
45th Driest
Driest since:
1931
83rd Wettest
Wettest since:
2019
Nov 1916–May 1917
7-Month
15.49"
(393.45mm)
16.96"
(430.78mm)
-1.47"
(-37.33mm)
20th Driest
Driest since:
1934
108th Wettest
Wettest since:
1983
Oct 1916–May 1917
8-Month
17.59"
(446.79mm)
19.13"
(485.90mm)
-1.54"
(-39.11mm)
24th Driest
Driest since:
1934
104th Wettest
Wettest since:
2019
Sep 1916–May 1917
9-Month
19.57"
(497.08mm)
21.62"
(549.15mm)
-2.05"
(-52.07mm)
17th Driest
Driest since:
1934
111th Wettest
Wettest since:
2019
Aug 1916–May 1917
10-Month
22.10"
(561.34mm)
24.25"
(615.95mm)
-2.15"
(-54.61mm)
17th Driest
Driest since:
1918
111th Wettest
Wettest since:
2019
Jul 1916–May 1917
11-Month
25.32"
(643.13mm)
27.03"
(686.56mm)
-1.71"
(-43.43mm)
26th Driest
Driest since:
1931
102nd Wettest
Wettest since:
2019
Jun 1916–May 1917
12-Month
28.56"
(725.42mm)
29.95"
(760.73mm)
-1.39"
(-35.31mm)
35th Driest
Driest since:
1934
93rd Wettest
Wettest since:
2019
Dec 1915–May 1917
18-Month
43.85"
(1,113.79mm)
44.70"
(1,135.38mm)
-0.85"
(-21.59mm)
43rd Driest
Driest since:
1931
84th Wettest
Wettest since:
2019
Jun 1915–May 1917
24-Month
60.75"
(1,543.05mm)
59.92"
(1,521.97mm)
0.83"
(21.08mm)
71st Driest
Driest since:
1931
56th Wettest
Wettest since:
2020
Jun 1914–May 1917
36-Month
91.16"
(2,315.46mm)
89.88"
(2,282.95mm)
1.28"
(32.51mm)
75th Driest
Driest since:
1955
51st Wettest
Wettest since:
2019
Jun 1913–May 1917
48-Month
120.32"
(3,056.13mm)
119.78"
(3,042.41mm)
0.54"
(13.72mm)
59th Driest
Driest since:
1956
66th Wettest
Wettest since:
2019
Jun 1912–May 1917
60-Month
149.65"
(3,801.11mm)
149.64"
(3,800.86mm)
0.01"
(0.25mm)
59th Driest
Driest since:
1957
65th Wettest
Wettest since:
2020

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