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 1971

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 1971
1-Month
2.83"
(71.88mm)
2.49"
(63.25mm)
0.34"
(8.63mm)
106th Driest
Driest since:
1956
23rd Wettest
Wettest since:
1986
Ties: 1923
Aug–Sep 1971
2-Month
5.58"
(141.73mm)
5.11"
(129.79mm)
0.47"
(11.94mm)
106th Driest
Driest since:
1956
23rd Wettest
Wettest since:
1977
Ties: 1959
Jul–Sep 1971
3-Month
8.58"
(217.93mm)
7.88"
(200.15mm)
0.70"
(17.78mm)
104th Driest
Driest since:
1930
25th Wettest
Wettest since:
1915
Jun–Sep 1971
4-Month
11.11"
(282.19mm)
10.81"
(274.57mm)
0.30"
(7.62mm)
79th Driest
Driest since:
1930
50th Wettest
Wettest since:
1915
Ties: 1998
May–Sep 1971
5-Month
14.03"
(356.36mm)
13.72"
(348.49mm)
0.31"
(7.87mm)
74th Driest
Driest since:
1956
55th Wettest
Wettest since:
1915
Ties: 1919
Apr–Sep 1971
6-Month
15.89"
(403.61mm)
16.24"
(412.50mm)
-0.35"
(-8.89mm)
48th Driest
Driest since:
1956
81st Wettest
Wettest since:
1915
Mar–Sep 1971
7-Month
17.97"
(456.44mm)
18.75"
(476.25mm)
-0.78"
(-19.81mm)
37th Driest
Driest since:
1956
92nd Wettest
Wettest since:
1973
Feb–Sep 1971
8-Month
20.34"
(516.64mm)
20.88"
(530.35mm)
-0.54"
(-13.71mm)
41st Driest
Driest since:
1930
88th Wettest
Wettest since:
2019
Jan–Sep 1971
9-Month
22.37"
(568.20mm)
23.20"
(589.28mm)
-0.83"
(-21.08mm)
35th Driest
Driest since:
1934
94th Wettest
Wettest since:
2019
Dec 1970–Sep 1971
10-Month
24.59"
(624.59mm)
25.54"
(648.72mm)
-0.95"
(-24.13mm)
37th Driest
Driest since:
1931
91st Wettest
Wettest since:
2019
Nov 1970–Sep 1971
11-Month
26.79"
(680.47mm)
27.77"
(705.36mm)
-0.98"
(-24.89mm)
37th Driest
Driest since:
1934
91st Wettest
Wettest since:
2019
Oct 1970–Sep 1971
12-Month
29.67"
(753.62mm)
29.94"
(760.48mm)
-0.27"
(-6.86mm)
52nd Driest
Driest since:
1934
76th Wettest
Wettest since:
2019
Apr 1970–Sep 1971
18-Month
45.67"
(1,160.02mm)
46.20"
(1,173.48mm)
-0.53"
(-13.46mm)
47th Driest
Driest since:
1931
81st Wettest
Wettest since:
2019
Oct 1969–Sep 1971
24-Month
59.30"
(1,506.22mm)
59.92"
(1,521.97mm)
-0.62"
(-15.75mm)
49th Driest
Driest since:
1918
78th Wettest
Wettest since:
2020
Oct 1968–Sep 1971
36-Month
90.41"
(2,296.41mm)
89.87"
(2,282.70mm)
0.54"
(13.71mm)
65th Driest
Driest since:
1956
61st Wettest
Wettest since:
2019
Oct 1967–Sep 1971
48-Month
120.10"
(3,050.54mm)
119.78"
(3,042.41mm)
0.32"
(8.13mm)
61st Driest
Driest since:
1956
64th Wettest
Wettest since:
2019
Oct 1966–Sep 1971
60-Month
148.91"
(3,782.31mm)
149.66"
(3,801.36mm)
-0.75"
(-19.05mm)
54th Driest
Driest since:
1956
70th Wettest
Wettest since:
2020

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