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 1956

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  • Record Wettest
PeriodValue1901-2000
Mean
AnomalyRank
(1895-2022)
Wettest/Driest
Since
Record
September 1956
1-Month
1.44"
(36.58mm)
2.49"
(63.25mm)
-1.05"
(-26.67mm)
1st Driest
Driest to Date
1956
128th Wettest
Wettest since:
1986
Aug–Sep 1956
2-Month
3.65"
(92.71mm)
5.11"
(129.79mm)
-1.46"
(-37.08mm)
1st Driest
Driest to Date
1956
128th Wettest
Wettest since:
1977
Jul–Sep 1956
3-Month
6.43"
(163.32mm)
7.88"
(200.15mm)
-1.45"
(-36.83mm)
3rd Driest
Driest since:
1930
126th Wettest
Wettest since:
1915
Jun–Sep 1956
4-Month
8.64"
(219.46mm)
10.81"
(274.57mm)
-2.17"
(-55.11mm)
2nd Driest
Driest since:
1930
127th Wettest
Wettest since:
1915
May–Sep 1956
5-Month
11.24"
(285.50mm)
13.72"
(348.49mm)
-2.48"
(-62.99mm)
1st Driest
Driest to Date
1956
128th Wettest
Wettest since:
1915
Apr–Sep 1956
6-Month
13.31"
(338.07mm)
16.24"
(412.50mm)
-2.93"
(-74.43mm)
1st Driest
Driest to Date
1956
128th Wettest
Wettest since:
1915
Mar–Sep 1956
7-Month
15.13"
(384.30mm)
18.75"
(476.25mm)
-3.62"
(-91.95mm)
1st Driest
Driest to Date
1956
128th Wettest
Wettest since:
1973
Feb–Sep 1956
8-Month
17.75"
(450.85mm)
20.88"
(530.35mm)
-3.13"
(-79.50mm)
6th Driest
Driest since:
1930
123rd Wettest
Wettest since:
2019
Jan–Sep 1956
9-Month
20.02"
(508.51mm)
23.20"
(589.28mm)
-3.18"
(-80.77mm)
6th Driest
Driest since:
1934
123rd Wettest
Wettest since:
2019
Dec 1955–Sep 1956
10-Month
22.26"
(565.40mm)
25.54"
(648.72mm)
-3.28"
(-83.32mm)
6th Driest
Driest since:
1931
122nd Wettest
Wettest since:
2019
Nov 1955–Sep 1956
11-Month
24.18"
(614.17mm)
27.77"
(705.36mm)
-3.59"
(-91.19mm)
6th Driest
Driest since:
1934
122nd Wettest
Wettest since:
2019
Oct 1955–Sep 1956
12-Month
26.22"
(665.99mm)
29.94"
(760.48mm)
-3.72"
(-94.49mm)
7th Driest
Driest since:
1934
121st Wettest
Wettest since:
2019
Apr 1955–Sep 1956
18-Month
41.87"
(1,063.50mm)
46.20"
(1,173.48mm)
-4.33"
(-109.98mm)
11th Driest
Driest since:
1931
117th Wettest
Wettest since:
2019
Oct 1954–Sep 1956
24-Month
53.65"
(1,362.71mm)
59.92"
(1,521.97mm)
-6.27"
(-159.26mm)
4th Driest
Driest since:
1918
123rd Wettest
Wettest since:
2020
Oct 1953–Sep 1956
36-Month
79.71"
(2,024.63mm)
89.87"
(2,282.70mm)
-10.16"
(-258.07mm)
1st Driest
Driest to Date
1956
125th Wettest
Wettest since:
2019
Oct 1952–Sep 1956
48-Month
107.36"
(2,726.94mm)
119.78"
(3,042.41mm)
-12.42"
(-315.47mm)
1st Driest
Driest to Date
1956
124th Wettest
Wettest since:
2019
Oct 1951–Sep 1956
60-Month
136.41"
(3,464.81mm)
149.66"
(3,801.36mm)
-13.25"
(-336.55mm)
1st Driest
Driest to Date
1956
123rd Wettest
Wettest since:
2020

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