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 1921

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  • Record Wettest
PeriodValue1901-2000
Mean		AnomalyRank
(1895-2022)		Wettest/Driest
Since		Record
August 1921
1-Month		2.60"
(66.04mm)		2.62"
(66.55mm)		-0.02"
(-0.51mm)		65th Driest
Driest since:
1929
64th Wettest
Wettest since:
1977
Ties: 1945, 1991, 2007
Jul–Aug 1921
2-Month		5.46"
(138.68mm)		5.40"
(137.16mm)		0.06"
(1.52mm)		58th Driest
Driest since:
1930
71st Wettest
Wettest since:
1915
Ties: 1951
Jun–Aug 1921
3-Month		8.36"
(212.34mm)		8.32"
(211.33mm)		0.04"
(1.01mm)		60th Driest
Driest since:
1930
69th Wettest
Wettest since:
1928
May–Aug 1921
4-Month		10.91"
(277.11mm)		11.23"
(285.24mm)		-0.32"
(-8.13mm)		40th Driest
Driest since:
1936
89th Wettest
Wettest since:
1915
Apr–Aug 1921
5-Month		13.70"
(347.98mm)		13.75"
(349.25mm)		-0.05"
(-1.27mm)		52nd Driest
Driest since:
1934
77th Wettest
Wettest since:
2019
Ties: 1953, 2020
Mar–Aug 1921
6-Month		16.22"
(411.99mm)		16.26"
(413.00mm)		-0.04"
(-1.01mm)		55th Driest
Driest since:
1936
74th Wettest
Wettest since:
1905
Ties: 1951
Feb–Aug 1921
7-Month		17.99"
(456.95mm)		18.40"
(467.36mm)		-0.41"
(-10.41mm)		48th Driest
Driest since:
1934
81st Wettest
Wettest since:
2019
Jan–Aug 1921
8-Month		20.10"
(510.54mm)		20.71"
(526.03mm)		-0.61"
(-15.49mm)		39th Driest
Driest since:
1934
90th Wettest
Wettest since:
2019
Ties: 1967
Dec 1920–Aug 1921
9-Month		22.85"
(580.39mm)		23.05"
(585.47mm)		-0.20"
(-5.08mm)		55th Driest
Driest since:
1931
73rd Wettest
Wettest since:
2019
Nov 1920–Aug 1921
10-Month		25.11"
(637.79mm)		25.28"
(642.11mm)		-0.17"
(-4.32mm)		52nd Driest
Driest since:
1934
76th Wettest
Wettest since:
2019
Oct 1920–Aug 1921
11-Month		27.28"
(692.91mm)		27.45"
(697.23mm)		-0.17"
(-4.32mm)		50th Driest
Driest since:
1934
78th Wettest
Wettest since:
2019
Sep 1920–Aug 1921
12-Month		29.72"
(754.89mm)		29.94"
(760.48mm)		-0.22"
(-5.59mm)		52nd Driest
Driest since:
1934
76th Wettest
Wettest since:
2019
Mar 1920–Aug 1921
18-Month		47.58"
(1,208.53mm)		46.22"
(1,173.99mm)		1.36"
(34.54mm)		84th Driest
Driest since:
1931
44th Wettest
Wettest since:
2019
Ties: 1990
Sep 1919–Aug 1921
24-Month		61.80"
(1,569.72mm)		59.92"
(1,521.97mm)		1.88"
(47.75mm)		86th Driest
Driest since:
1918
41st Wettest
Wettest since:
2020
Sep 1918–Aug 1921
36-Month		93.50"
(2,374.90mm)		89.86"
(2,282.44mm)		3.64"
(92.46mm)		97th Driest
Driest since:
1956
29th Wettest
Wettest since:
2019
Ties: 1916, 1943
Sep 1917–Aug 1921
48-Month		118.10"
(2,999.74mm)		119.77"
(3,042.16mm)		-1.67"
(-42.42mm)		42nd Driest
Driest since:
1956
83rd Wettest
Wettest since:
2019
Sep 1916–Aug 1921
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: 1918

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