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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