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 2017

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  • Record Wettest
PeriodValue1901-2000
Mean		AnomalyRank
(1895-2022)		Wettest/Driest
Since		Record
August 2017
1-Month		3.42"
(86.87mm)		2.62"
(66.55mm)		0.80"
(20.32mm)		124th Driest
Driest since:
1929
5th Wettest
Wettest since:
1977
Jul–Aug 2017
2-Month		6.22"
(157.99mm)		5.40"
(137.16mm)		0.82"
(20.83mm)		120th Driest
Driest since:
1930
9th Wettest
Wettest since:
1915
Ties: 1928
Jun–Aug 2017
3-Month		9.29"
(235.97mm)		8.32"
(211.33mm)		0.97"
(24.64mm)		115th Driest
Driest since:
1930
14th Wettest
Wettest since:
1928
May–Aug 2017
4-Month		12.65"
(321.31mm)		11.23"
(285.24mm)		1.42"
(36.07mm)		119th Driest
Driest since:
1936
10th Wettest
Wettest since:
1915
Ties: 1989
Apr–Aug 2017
5-Month		16.15"
(410.21mm)		13.75"
(349.25mm)		2.40"
(60.96mm)		125th Driest
Driest since:
1934
4th Wettest
Wettest since:
2019
Mar–Aug 2017
6-Month		18.74"
(476.00mm)		16.26"
(413.00mm)		2.48"
(63.00mm)		126th Driest
Driest since:
1936
3rd Wettest
Wettest since:
1905
Feb–Aug 2017
7-Month		20.99"
(533.15mm)		18.40"
(467.36mm)		2.59"
(65.79mm)		125th Driest
Driest since:
1934
4th Wettest
Wettest since:
2019
Jan–Aug 2017
8-Month		24.23"
(615.44mm)		20.71"
(526.03mm)		3.52"
(89.41mm)		127th Driest
Driest since:
1934
2nd Wettest
Wettest to Date
2019
Dec 2016–Aug 2017
9-Month		26.95"
(684.53mm)		23.05"
(585.47mm)		3.90"
(99.06mm)		126th Driest
Driest since:
1931
2nd Wettest
Wettest to Date
2019
Nov 2016–Aug 2017
10-Month		28.70"
(728.98mm)		25.28"
(642.11mm)		3.42"
(86.87mm)		121st Driest
Driest since:
1934
7th Wettest
Wettest since:
2019
Oct 2016–Aug 2017
11-Month		31.09"
(789.69mm)		27.45"
(697.23mm)		3.64"
(92.46mm)		121st Driest
Driest since:
1934
7th Wettest
Wettest since:
2019
Sep 2016–Aug 2017
12-Month		33.82"
(859.03mm)		29.94"
(760.48mm)		3.88"
(98.55mm)		121st Driest
Driest since:
1934
7th Wettest
Wettest since:
2019
Mar 2016–Aug 2017
18-Month		51.68"
(1,312.67mm)		46.22"
(1,173.99mm)		5.46"
(138.68mm)		123rd Driest
Driest since:
1931
5th Wettest
Wettest since:
2019
Sep 2015–Aug 2017
24-Month		68.08"
(1,729.23mm)		59.92"
(1,521.97mm)		8.16"
(207.26mm)		125th Driest
Driest since:
1918
2nd Wettest
Wettest to Date
2020
Sep 2014–Aug 2017
36-Month		100.01"
(2,540.25mm)		89.86"
(2,282.44mm)		10.15"
(257.81mm)		123rd Driest
Driest since:
1956
3rd Wettest
Wettest since:
2019
Sep 2013–Aug 2017
48-Month		130.55"
(3,315.97mm)		119.77"
(3,042.16mm)		10.78"
(273.81mm)		120th Driest
Driest since:
1956
5th Wettest
Wettest since:
2019
Sep 2012–Aug 2017
60-Month		160.92"
(4,087.37mm)		149.64"
(3,800.86mm)		11.28"
(286.51mm)		116th Driest
Driest since:
1934
8th Wettest
Wettest since:
2019

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