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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