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 1970

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 1970
1-Month
3.06"
(77.72mm)
2.49"
(63.25mm)
0.57"
(14.47mm)
118th Driest
Driest since:
1956
11th Wettest
Wettest since:
1986
Aug–Sep 1970
2-Month
5.43"
(137.92mm)
5.11"
(129.79mm)
0.32"
(8.13mm)
95th Driest
Driest since:
1956
34th Wettest
Wettest since:
1977
Jul–Sep 1970
3-Month
7.84"
(199.14mm)
7.88"
(200.15mm)
-0.04"
(-1.01mm)
62nd Driest
Driest since:
1930
67th Wettest
Wettest since:
1915
Jun–Sep 1970
4-Month
10.61"
(269.49mm)
10.81"
(274.57mm)
-0.20"
(-5.08mm)
47th Driest
Driest since:
1930
82nd Wettest
Wettest since:
1915
May–Sep 1970
5-Month
13.22"
(335.79mm)
13.72"
(348.49mm)
-0.50"
(-12.70mm)
41st Driest
Driest since:
1956
88th Wettest
Wettest since:
1915
Ties: 2022
Apr–Sep 1970
6-Month
16.00"
(406.40mm)
16.24"
(412.50mm)
-0.24"
(-6.10mm)
51st Driest
Driest since:
1956
78th Wettest
Wettest since:
1915
Mar–Sep 1970
7-Month
18.68"
(474.47mm)
18.75"
(476.25mm)
-0.07"
(-1.78mm)
55th Driest
Driest since:
1956
74th Wettest
Wettest since:
1973
Ties: 1999
Feb–Sep 1970
8-Month
20.31"
(515.87mm)
20.88"
(530.35mm)
-0.57"
(-14.48mm)
40th Driest
Driest since:
1930
89th Wettest
Wettest since:
2019
Jan–Sep 1970
9-Month
22.40"
(568.96mm)
23.20"
(589.28mm)
-0.80"
(-20.32mm)
36th Driest
Driest since:
1934
93rd Wettest
Wettest since:
2019
Ties: 1960
Dec 1969–Sep 1970
10-Month
25.34"
(643.64mm)
25.54"
(648.72mm)
-0.20"
(-5.08mm)
55th Driest
Driest since:
1931
73rd Wettest
Wettest since:
2019
Nov 1969–Sep 1970
11-Month
26.93"
(684.02mm)
27.77"
(705.36mm)
-0.84"
(-21.34mm)
40th Driest
Driest since:
1934
88th Wettest
Wettest since:
2019
Oct 1969–Sep 1970
12-Month
29.63"
(752.60mm)
29.94"
(760.48mm)
-0.31"
(-7.88mm)
51st Driest
Driest since:
1934
77th Wettest
Wettest since:
2019
Apr 1969–Sep 1970
18-Month
45.90"
(1,165.86mm)
46.20"
(1,173.48mm)
-0.30"
(-7.62mm)
51st Driest
Driest since:
1931
77th Wettest
Wettest since:
2019
Oct 1968–Sep 1970
24-Month
60.74"
(1,542.80mm)
59.92"
(1,521.97mm)
0.82"
(20.83mm)
72nd Driest
Driest since:
1918
55th Wettest
Wettest since:
2020
Oct 1967–Sep 1970
36-Month
90.43"
(2,296.92mm)
89.87"
(2,282.70mm)
0.56"
(14.22mm)
66th Driest
Driest since:
1956
60th Wettest
Wettest since:
2019
Oct 1966–Sep 1970
48-Month
119.24"
(3,028.70mm)
119.78"
(3,042.41mm)
-0.54"
(-13.71mm)
54th Driest
Driest since:
1956
71st Wettest
Wettest since:
2019
Oct 1965–Sep 1970
60-Month
146.09"
(3,710.69mm)
149.66"
(3,801.36mm)
-3.57"
(-90.67mm)
29th Driest
Driest since:
1956
95th Wettest
Wettest since:
2020

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