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 2006

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  • Record Wettest
PeriodValue1901-2000
Mean
AnomalyRank
(1895-2022)
Wettest/Driest
Since
Record
September 2006
1-Month
2.80"
(71.12mm)
2.49"
(63.25mm)
0.31"
(7.87mm)
100th Driest
Driest since:
1956
29th Wettest
Wettest since:
1986
Aug–Sep 2006
2-Month
5.60"
(142.24mm)
5.11"
(129.79mm)
0.49"
(12.45mm)
107th Driest
Driest since:
1956
22nd Wettest
Wettest since:
1977
Jul–Sep 2006
3-Month
8.06"
(204.72mm)
7.88"
(200.15mm)
0.18"
(4.57mm)
82nd Driest
Driest since:
1930
47th Wettest
Wettest since:
1915
Ties: 1907
Jun–Sep 2006
4-Month
10.62"
(269.75mm)
10.81"
(274.57mm)
-0.19"
(-4.82mm)
48th Driest
Driest since:
1930
81st Wettest
Wettest since:
1915
May–Sep 2006
5-Month
12.91"
(327.91mm)
13.72"
(348.49mm)
-0.81"
(-20.58mm)
29th Driest
Driest since:
1956
100th Wettest
Wettest since:
1915
Apr–Sep 2006
6-Month
15.45"
(392.43mm)
16.24"
(412.50mm)
-0.79"
(-20.07mm)
32nd Driest
Driest since:
1956
97th Wettest
Wettest since:
1915
Mar–Sep 2006
7-Month
17.76"
(451.10mm)
18.75"
(476.25mm)
-0.99"
(-25.15mm)
28th Driest
Driest since:
1956
101st Wettest
Wettest since:
1973
Feb–Sep 2006
8-Month
19.28"
(489.71mm)
20.88"
(530.35mm)
-1.60"
(-40.64mm)
19th Driest
Driest since:
1930
110th Wettest
Wettest since:
2019
Jan–Sep 2006
9-Month
21.89"
(556.01mm)
23.20"
(589.28mm)
-1.31"
(-33.27mm)
26th Driest
Driest since:
1934
103rd Wettest
Wettest since:
2019
Dec 2005–Sep 2006
10-Month
24.18"
(614.17mm)
25.54"
(648.72mm)
-1.36"
(-34.55mm)
28th Driest
Driest since:
1931
100th Wettest
Wettest since:
2019
Nov 2005–Sep 2006
11-Month
26.40"
(670.56mm)
27.77"
(705.36mm)
-1.37"
(-34.80mm)
31st Driest
Driest since:
1934
97th Wettest
Wettest since:
2019
Oct 2005–Sep 2006
12-Month
28.77"
(730.76mm)
29.94"
(760.48mm)
-1.17"
(-29.72mm)
33rd Driest
Driest since:
1934
95th Wettest
Wettest since:
2019
Apr 2005–Sep 2006
18-Month
44.87"
(1,139.70mm)
46.20"
(1,173.48mm)
-1.33"
(-33.78mm)
40th Driest
Driest since:
1931
88th Wettest
Wettest since:
2019
Oct 2004–Sep 2006
24-Month
60.37"
(1,533.40mm)
59.92"
(1,521.97mm)
0.45"
(11.43mm)
63rd Driest
Driest since:
1918
64th Wettest
Wettest since:
2020
Oct 2003–Sep 2006
36-Month
91.98"
(2,336.29mm)
89.87"
(2,282.70mm)
2.11"
(53.59mm)
83rd Driest
Driest since:
1956
43rd Wettest
Wettest since:
2019
Oct 2002–Sep 2006
48-Month
123.68"
(3,141.47mm)
119.78"
(3,042.41mm)
3.90"
(99.06mm)
97th Driest
Driest since:
1956
28th Wettest
Wettest since:
2019
Oct 2001–Sep 2006
60-Month
151.59"
(3,850.39mm)
149.66"
(3,801.36mm)
1.93"
(49.03mm)
72nd Driest
Driest since:
1956
52nd Wettest
Wettest since:
2020

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