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, October 2015

View Period (Months):
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  • Record Driest
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  • Record Wettest
Period Value 1901-2000
Mean
Anomaly Rank
(1895-2022)
Wettest/Driest
Since
Record
October 2015
1-Month
2.90"
(73.66mm)
2.16"
(54.86mm)
0.74"
(18.80mm)
113th Driest
Driest since:
1952
16th Wettest
Wettest since:
2009
Ties: 2006
Sep–Oct 2015
2-Month
5.02"
(127.51mm)
4.65"
(118.11mm)
0.37"
(9.40mm)
90th Driest
Driest since:
1952
39th Wettest
Wettest since:
2018
Ties: 1949
Aug–Oct 2015
3-Month
7.43"
(188.72mm)
7.27"
(184.66mm)
0.16"
(4.06mm)
69th Driest
Driest since:
1952
60th Wettest
Wettest since:
2018
Jul–Oct 2015
4-Month
10.66"
(270.76mm)
10.05"
(255.27mm)
0.61"
(15.49mm)
87th Driest
Driest since:
1952
42nd Wettest
Wettest since:
1941
Jun–Oct 2015
5-Month
14.21"
(360.93mm)
12.97"
(329.44mm)
1.24"
(31.49mm)
107th Driest
Driest since:
1952
22nd Wettest
Wettest since:
1941
May–Oct 2015
6-Month
18.65"
(473.71mm)
15.88"
(403.35mm)
2.77"
(70.36mm)
122nd Driest
Driest since:
1952
7th Wettest
Wettest since:
1941
Apr–Oct 2015
7-Month
21.48"
(545.59mm)
18.40"
(467.36mm)
3.08"
(78.23mm)
124th Driest
Driest since:
1952
5th Wettest
Wettest since:
1941
Mar–Oct 2015
8-Month
23.61"
(599.69mm)
20.91"
(531.11mm)
2.70"
(68.58mm)
122nd Driest
Driest since:
1956
7th Wettest
Wettest since:
2019
Ties: 2017
Feb–Oct 2015
9-Month
25.35"
(643.89mm)
23.04"
(585.22mm)
2.31"
(58.67mm)
116th Driest
Driest since:
1934
13th Wettest
Wettest since:
2019
Jan–Oct 2015
10-Month
27.18"
(690.37mm)
25.36"
(644.14mm)
1.82"
(46.23mm)
107th Driest
Driest since:
1934
22nd Wettest
Wettest since:
2019
Ties: 1991
Dec 2014–Oct 2015
11-Month
29.76"
(755.90mm)
27.70"
(703.58mm)
2.06"
(52.32mm)
103rd Driest
Driest since:
1931
25th Wettest
Wettest since:
2019
Nov 2014–Oct 2015
12-Month
31.89"
(810.01mm)
29.93"
(760.22mm)
1.96"
(49.79mm)
99th Driest
Driest since:
1934
29th Wettest
Wettest since:
2019
May 2014–Oct 2015
18-Month
49.16"
(1,248.66mm)
45.83"
(1,164.08mm)
3.33"
(84.58mm)
106th Driest
Driest since:
1931
22nd Wettest
Wettest since:
2019
Ties: 1984
Nov 2013–Oct 2015
24-Month
62.28"
(1,581.91mm)
59.90"
(1,521.46mm)
2.38"
(60.45mm)
88th Driest
Driest since:
1931
39th Wettest
Wettest since:
2019
Nov 2012–Oct 2015
36-Month
93.29"
(2,369.57mm)
89.86"
(2,282.44mm)
3.43"
(87.13mm)
95th Driest
Driest since:
1956
31st Wettest
Wettest since:
2019
Nov 2011–Oct 2015
48-Month
121.35"
(3,082.29mm)
119.78"
(3,042.41mm)
1.57"
(39.88mm)
72nd Driest
Driest since:
1956
53rd Wettest
Wettest since:
2019
Nov 2010–Oct 2015
60-Month
151.39"
(3,845.31mm)
149.66"
(3,801.36mm)
1.73"
(43.95mm)
71st Driest
Driest since:
1934
53rd Wettest
Wettest since:
2019

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