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 2015

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  • Record Wettest
PeriodValue1901-2000
Mean		AnomalyRank
(1895-2022)		Wettest/Driest
Since		Record
August 2015
1-Month		2.41"
(61.21mm)		2.62"
(66.55mm)		-0.21"
(-5.34mm)		33rd Driest
Driest since:
1929
96th Wettest
Wettest since:
1977
Ties: 1909, 2001
Jul–Aug 2015
2-Month		5.64"
(143.26mm)		5.40"
(137.16mm)		0.24"
(6.10mm)		85th Driest
Driest since:
1930
44th Wettest
Wettest since:
1915
Jun–Aug 2015
3-Month		9.19"
(233.43mm)		8.32"
(211.33mm)		0.87"
(22.10mm)		111th Driest
Driest since:
1930
18th Wettest
Wettest since:
1928
May–Aug 2015
4-Month		13.63"
(346.20mm)		11.23"
(285.24mm)		2.40"
(60.96mm)		127th Driest
Driest since:
1936
2nd Wettest
Wettest since:
1915
Apr–Aug 2015
5-Month		16.46"
(418.08mm)		13.75"
(349.25mm)		2.71"
(68.83mm)		127th Driest
Driest since:
1934
2nd Wettest
Wettest to Date
2019
Mar–Aug 2015
6-Month		18.59"
(472.19mm)		16.26"
(413.00mm)		2.33"
(59.19mm)		125th Driest
Driest since:
1936
4th Wettest
Wettest since:
1905
Feb–Aug 2015
7-Month		20.33"
(516.38mm)		18.40"
(467.36mm)		1.93"
(49.02mm)		115th Driest
Driest since:
1934
14th Wettest
Wettest since:
2019
Jan–Aug 2015
8-Month		22.16"
(562.86mm)		20.71"
(526.03mm)		1.45"
(36.83mm)		104th Driest
Driest since:
1934
25th Wettest
Wettest since:
2019
Dec 2014–Aug 2015
9-Month		24.74"
(628.40mm)		23.05"
(585.47mm)		1.69"
(42.93mm)		107th Driest
Driest since:
1931
21st Wettest
Wettest since:
2019
Ties: 1982
Nov 2014–Aug 2015
10-Month		26.87"
(682.50mm)		25.28"
(642.11mm)		1.59"
(40.39mm)		102nd Driest
Driest since:
1934
26th Wettest
Wettest since:
2019
Oct 2014–Aug 2015
11-Month		29.29"
(743.97mm)		27.45"
(697.23mm)		1.84"
(46.74mm)		99th Driest
Driest since:
1934
29th Wettest
Wettest since:
2019
Sep 2014–Aug 2015
12-Month		31.93"
(811.02mm)		29.94"
(760.48mm)		1.99"
(50.54mm)		102nd Driest
Driest since:
1934
26th Wettest
Wettest since:
2019
Ties: 1982
Mar 2014–Aug 2015
18-Month		49.39"
(1,254.51mm)		46.22"
(1,173.99mm)		3.17"
(80.52mm)		107th Driest
Driest since:
1931
21st Wettest
Wettest since:
2019
Ties: 1996
Sep 2013–Aug 2015
24-Month		62.47"
(1,586.74mm)		59.92"
(1,521.97mm)		2.55"
(64.77mm)		93rd Driest
Driest since:
1918
34th Wettest
Wettest since:
2020
Sep 2012–Aug 2015
36-Month		92.84"
(2,358.14mm)		89.86"
(2,282.44mm)		2.98"
(75.70mm)		90th Driest
Driest since:
1956
36th Wettest
Wettest since:
2019
Sep 2011–Aug 2015
48-Month		120.95"
(3,072.13mm)		119.77"
(3,042.16mm)		1.18"
(29.97mm)		67th Driest
Driest since:
1956
58th Wettest
Wettest since:
2019
Sep 2010–Aug 2015
60-Month		151.12"
(3,838.45mm)		149.64"
(3,800.86mm)		1.48"
(37.59mm)		67th Driest
Driest since:
1934
57th Wettest
Wettest since:
2019

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