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 1955

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
September 1955
1-Month
2.11"
(53.59mm)
2.49"
(63.25mm)
-0.38"
(-9.66mm)
22nd Driest
Driest since:
1956
107th Wettest
Wettest since:
1986
Ties: 1928
Aug–Sep 1955
2-Month
4.85"
(123.19mm)
5.11"
(129.79mm)
-0.26"
(-6.60mm)
41st Driest
Driest since:
1956
88th Wettest
Wettest since:
1977
Jul–Sep 1955
3-Month
7.77"
(197.36mm)
7.88"
(200.15mm)
-0.11"
(-2.79mm)
54th Driest
Driest since:
1930
75th Wettest
Wettest since:
1915
Ties: 1994
Jun–Sep 1955
4-Month
10.24"
(260.10mm)
10.81"
(274.57mm)
-0.57"
(-14.47mm)
32nd Driest
Driest since:
1930
97th Wettest
Wettest since:
1915
May–Sep 1955
5-Month
13.16"
(334.26mm)
13.72"
(348.49mm)
-0.56"
(-14.23mm)
40th Driest
Driest since:
1956
89th Wettest
Wettest since:
1915
Apr–Sep 1955
6-Month
15.65"
(397.51mm)
16.24"
(412.50mm)
-0.59"
(-14.99mm)
36th Driest
Driest since:
1956
93rd Wettest
Wettest since:
1915
Ties: 1948
Mar–Sep 1955
7-Month
17.63"
(447.80mm)
18.75"
(476.25mm)
-1.12"
(-28.45mm)
25th Driest
Driest since:
1956
104th Wettest
Wettest since:
1973
Feb–Sep 1955
8-Month
19.85"
(504.19mm)
20.88"
(530.35mm)
-1.03"
(-26.16mm)
31st Driest
Driest since:
1930
98th Wettest
Wettest since:
2019
Jan–Sep 1955
9-Month
21.54"
(547.12mm)
23.20"
(589.28mm)
-1.66"
(-42.16mm)
21st Driest
Driest since:
1934
108th Wettest
Wettest since:
2019
Dec 1954–Sep 1955
10-Month
23.54"
(597.92mm)
25.54"
(648.72mm)
-2.00"
(-50.80mm)
17th Driest
Driest since:
1931
111th Wettest
Wettest since:
2019
Ties: 1917
Nov 1954–Sep 1955
11-Month
25.08"
(637.03mm)
27.77"
(705.36mm)
-2.69"
(-68.33mm)
13th Driest
Driest since:
1934
115th Wettest
Wettest since:
2019
Ties: 1936
Oct 1954–Sep 1955
12-Month
27.43"
(696.72mm)
29.94"
(760.48mm)
-2.51"
(-63.76mm)
17th Driest
Driest since:
1934
111th Wettest
Wettest since:
2019
Apr 1954–Sep 1955
18-Month
41.50"
(1,054.10mm)
46.20"
(1,173.48mm)
-4.70"
(-119.38mm)
8th Driest
Driest since:
1931
120th Wettest
Wettest since:
2019
Oct 1953–Sep 1955
24-Month
53.49"
(1,358.65mm)
59.92"
(1,521.97mm)
-6.43"
(-163.32mm)
3rd Driest
Driest since:
1918
124th Wettest
Wettest since:
2020
Oct 1952–Sep 1955
36-Month
81.14"
(2,060.96mm)
89.87"
(2,282.70mm)
-8.73"
(-221.74mm)
2nd Driest
Driest since:
1956
124th Wettest
Wettest since:
2019
Oct 1951–Sep 1955
48-Month
110.19"
(2,798.83mm)
119.78"
(3,042.41mm)
-9.59"
(-243.58mm)
2nd Driest
Driest since:
1956
123rd Wettest
Wettest since:
2019
Oct 1950–Sep 1955
60-Month
139.52"
(3,543.81mm)
149.66"
(3,801.36mm)
-10.14"
(-257.55mm)
4th Driest
Driest since:
1956
120th Wettest
Wettest since:
2020

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