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, September 2008

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  • Record Wettest
PeriodValue1901-2000
Mean
AnomalyRank
(1895-2022)
Wettest/Driest
Since
Record
September 2008
1-Month
2.68"
(68.07mm)
2.49"
(63.25mm)
0.19"
(4.82mm)
85th Driest
Driest since:
1956
44th Wettest
Wettest since:
1986
Ties: 1989
Aug–Sep 2008
2-Month
5.73"
(145.54mm)
5.11"
(129.79mm)
0.62"
(15.75mm)
109th Driest
Driest since:
1956
20th Wettest
Wettest since:
1977
Jul–Sep 2008
3-Month
8.53"
(216.66mm)
7.88"
(200.15mm)
0.65"
(16.51mm)
101st Driest
Driest since:
1930
28th Wettest
Wettest since:
1915
Jun–Sep 2008
4-Month
11.53"
(292.86mm)
10.81"
(274.57mm)
0.72"
(18.29mm)
100th Driest
Driest since:
1930
29th Wettest
Wettest since:
1915
Ties: 1973
May–Sep 2008
5-Month
14.53"
(369.06mm)
13.72"
(348.49mm)
0.81"
(20.57mm)
90th Driest
Driest since:
1956
39th Wettest
Wettest since:
1915
Apr–Sep 2008
6-Month
17.07"
(433.58mm)
16.24"
(412.50mm)
0.83"
(21.08mm)
87th Driest
Driest since:
1956
42nd Wettest
Wettest since:
1915
Mar–Sep 2008
7-Month
19.59"
(497.59mm)
18.75"
(476.25mm)
0.84"
(21.34mm)
86th Driest
Driest since:
1956
43rd Wettest
Wettest since:
1973
Ties: 1900
Feb–Sep 2008
8-Month
22.06"
(560.32mm)
20.88"
(530.35mm)
1.18"
(29.97mm)
92nd Driest
Driest since:
1930
37th Wettest
Wettest since:
2019
Jan–Sep 2008
9-Month
24.27"
(616.46mm)
23.20"
(589.28mm)
1.07"
(27.18mm)
93rd Driest
Driest since:
1934
36th Wettest
Wettest since:
2019
Dec 2007–Sep 2008
10-Month
27.24"
(691.90mm)
25.54"
(648.72mm)
1.70"
(43.18mm)
103rd Driest
Driest since:
1931
25th Wettest
Wettest since:
2019
Nov 2007–Sep 2008
11-Month
28.64"
(727.46mm)
27.77"
(705.36mm)
0.87"
(22.10mm)
80th Driest
Driest since:
1934
48th Wettest
Wettest since:
2019
Oct 2007–Sep 2008
12-Month
31.36"
(796.54mm)
29.94"
(760.48mm)
1.42"
(36.06mm)
88th Driest
Driest since:
1934
40th Wettest
Wettest since:
2019
Apr 2007–Sep 2008
18-Month
47.16"
(1,197.86mm)
46.20"
(1,173.48mm)
0.96"
(24.38mm)
75th Driest
Driest since:
1931
53rd Wettest
Wettest since:
2019
Oct 2006–Sep 2008
24-Month
61.38"
(1,559.05mm)
59.92"
(1,521.97mm)
1.46"
(37.08mm)
79th Driest
Driest since:
1918
48th Wettest
Wettest since:
2020
Oct 2005–Sep 2008
36-Month
90.15"
(2,289.81mm)
89.87"
(2,282.70mm)
0.28"
(7.11mm)
61st Driest
Driest since:
1956
65th Wettest
Wettest since:
2019
Oct 2004–Sep 2008
48-Month
121.75"
(3,092.45mm)
119.78"
(3,042.41mm)
1.97"
(50.04mm)
74th Driest
Driest since:
1956
51st Wettest
Wettest since:
2019
Oct 2003–Sep 2008
60-Month
153.36"
(3,895.34mm)
149.66"
(3,801.36mm)
3.70"
(93.98mm)
86th Driest
Driest since:
1956
38th Wettest
Wettest since:
2020

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