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, August 1918

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  • Record Wettest
Period Value 1901-2000
Mean
Anomaly Rank
(1895-2022)
Wettest/Driest
Since
Record
August 1918
1-Month
2.47"
(62.74mm)
2.62"
(66.55mm)
-0.15"
(-3.81mm)
42nd Driest
Driest since:
1929
87th Wettest
Wettest since:
1977
Ties: 2012
Jul–Aug 1918
2-Month
4.80"
(121.92mm)
5.40"
(137.16mm)
-0.60"
(-15.24mm)
18th Driest
Driest since:
1930
111th Wettest
Wettest since:
1915
Jun–Aug 1918
3-Month
7.05"
(179.07mm)
8.32"
(211.33mm)
-1.27"
(-32.26mm)
8th Driest
Driest to Date
1930
121st Wettest
Wettest since:
1928
May–Aug 1918
4-Month
9.64"
(244.86mm)
11.23"
(285.24mm)
-1.59"
(-40.38mm)
6th Driest
Driest to Date
1936
123rd Wettest
Wettest since:
1915
Apr–Aug 1918
5-Month
12.46"
(316.48mm)
13.75"
(349.25mm)
-1.29"
(-32.77mm)
15th Driest
Driest since:
1934
114th Wettest
Wettest since:
2019
Ties: 2002
Mar–Aug 1918
6-Month
14.31"
(363.47mm)
16.26"
(413.00mm)
-1.95"
(-49.53mm)
12th Driest
Driest since:
1936
117th Wettest
Wettest since:
1905
Feb–Aug 1918
7-Month
16.03"
(407.16mm)
18.40"
(467.36mm)
-2.37"
(-60.20mm)
8th Driest
Driest since:
1934
121st Wettest
Wettest since:
2019
Jan–Aug 1918
8-Month
18.44"
(468.38mm)
20.71"
(526.03mm)
-2.27"
(-57.65mm)
12th Driest
Driest since:
1934
117th Wettest
Wettest since:
2019
Dec 1917–Aug 1918
9-Month
20.10"
(510.54mm)
23.05"
(585.47mm)
-2.95"
(-74.93mm)
9th Driest
Driest since:
1931
119th Wettest
Wettest since:
2019
Nov 1917–Aug 1918
10-Month
21.05"
(534.67mm)
25.28"
(642.11mm)
-4.23"
(-107.44mm)
2nd Driest
Driest to Date
1934
126th Wettest
Wettest since:
2019
Oct 1917–Aug 1918
11-Month
22.43"
(569.72mm)
27.45"
(697.23mm)
-5.02"
(-127.51mm)
2nd Driest
Driest to Date
1934
126th Wettest
Wettest since:
2019
Sep 1917–Aug 1918
12-Month
24.60"
(624.84mm)
29.94"
(760.48mm)
-5.34"
(-135.64mm)
2nd Driest
Driest to Date
1934
126th Wettest
Wettest since:
2019
Mar 1917–Aug 1918
18-Month
39.79"
(1,010.67mm)
46.22"
(1,173.99mm)
-6.43"
(-163.32mm)
3rd Driest
Driest to Date
1931
125th Wettest
Wettest since:
2019
Sep 1916–Aug 1918
24-Month
51.56"
(1,309.62mm)
59.92"
(1,521.97mm)
-8.36"
(-212.35mm)
1st Driest
Driest to Date
1918
126th Wettest
Wettest since:
2020
Sep 1915–Aug 1918
36-Month
82.56"
(2,097.02mm)
89.86"
(2,282.44mm)
-7.30"
(-185.42mm)
5th Driest
Driest to Date
1956
121st Wettest
Wettest since:
2019
Sep 1914–Aug 1918
48-Month
114.68"
(2,912.87mm)
119.77"
(3,042.16mm)
-5.09"
(-129.29mm)
19th Driest
Driest since:
1956
106th Wettest
Wettest since:
2019
Sep 1913–Aug 1918
60-Month
145.06"
(3,684.52mm)
149.64"
(3,800.86mm)
-4.58"
(-116.34mm)
23rd Driest
Driest since:
1934
101st Wettest
Wettest since:
2019
Ties: 1921

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