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 1964

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  • Record Wettest
PeriodValue1901-2000
Mean
AnomalyRank
(1895-2022)
Wettest/Driest
Since
Record
September 1964
1-Month
2.54"
(64.52mm)
2.49"
(63.25mm)
0.05"
(1.27mm)
75th Driest
Driest since:
1956
54th Wettest
Wettest since:
1986
Ties: 1997, 2009
Aug–Sep 1964
2-Month
5.41"
(137.41mm)
5.11"
(129.79mm)
0.30"
(7.62mm)
94th Driest
Driest since:
1956
35th Wettest
Wettest since:
1977
Ties: 1989
Jul–Sep 1964
3-Month
8.02"
(203.71mm)
7.88"
(200.15mm)
0.14"
(3.56mm)
77th Driest
Driest since:
1930
52nd Wettest
Wettest since:
1915
Ties: 2003
Jun–Sep 1964
4-Month
10.83"
(275.08mm)
10.81"
(274.57mm)
0.02"
(0.51mm)
62nd Driest
Driest since:
1930
67th Wettest
Wettest since:
1915
Ties: 1919
May–Sep 1964
5-Month
13.08"
(332.23mm)
13.72"
(348.49mm)
-0.64"
(-16.26mm)
33rd Driest
Driest since:
1956
96th Wettest
Wettest since:
1915
Apr–Sep 1964
6-Month
16.37"
(415.80mm)
16.24"
(412.50mm)
0.13"
(3.30mm)
67th Driest
Driest since:
1956
62nd Wettest
Wettest since:
1915
Mar–Sep 1964
7-Month
19.20"
(487.68mm)
18.75"
(476.25mm)
0.45"
(11.43mm)
77th Driest
Driest since:
1956
52nd Wettest
Wettest since:
1973
Feb–Sep 1964
8-Month
20.76"
(527.30mm)
20.88"
(530.35mm)
-0.12"
(-3.05mm)
59th Driest
Driest since:
1930
70th Wettest
Wettest since:
2019
Jan–Sep 1964
9-Month
23.19"
(589.03mm)
23.20"
(589.28mm)
-0.01"
(-0.25mm)
61st Driest
Driest since:
1934
68th Wettest
Wettest since:
2019
Dec 1963–Sep 1964
10-Month
24.67"
(626.62mm)
25.54"
(648.72mm)
-0.87"
(-22.10mm)
42nd Driest
Driest since:
1931
86th Wettest
Wettest since:
2019
Nov 1963–Sep 1964
11-Month
27.33"
(694.18mm)
27.77"
(705.36mm)
-0.44"
(-11.18mm)
51st Driest
Driest since:
1934
77th Wettest
Wettest since:
2019
Oct 1963–Sep 1964
12-Month
28.29"
(718.57mm)
29.94"
(760.48mm)
-1.65"
(-41.91mm)
28th Driest
Driest since:
1934
100th Wettest
Wettest since:
2019
Apr 1963–Sep 1964
18-Month
43.12"
(1,095.25mm)
46.20"
(1,173.48mm)
-3.08"
(-78.23mm)
20th Driest
Driest since:
1931
108th Wettest
Wettest since:
2019
Oct 1962–Sep 1964
24-Month
54.85"
(1,393.19mm)
59.92"
(1,521.97mm)
-5.07"
(-128.78mm)
10th Driest
Driest since:
1918
117th Wettest
Wettest since:
2020
Oct 1961–Sep 1964
36-Month
84.55"
(2,147.57mm)
89.87"
(2,282.70mm)
-5.32"
(-135.13mm)
12th Driest
Driest since:
1956
114th Wettest
Wettest since:
2019
Oct 1960–Sep 1964
48-Month
115.09"
(2,923.29mm)
119.78"
(3,042.41mm)
-4.69"
(-119.12mm)
21st Driest
Driest since:
1956
104th Wettest
Wettest since:
2019
Oct 1959–Sep 1964
60-Month
144.93"
(3,681.22mm)
149.66"
(3,801.36mm)
-4.73"
(-120.14mm)
23rd Driest
Driest since:
1956
101st Wettest
Wettest since:
2020

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