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, May 1970

View Period (Months):
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  • Record Wettest
Period Value 1901-2000
Mean
Anomaly Rank
(1895-2022)
Wettest/Driest
Since
Record
May 1970
1-Month
2.61"
(66.29mm)
2.91"
(73.91mm)
-0.30"
(-7.62mm)
33rd Driest
Driest since:
1934
96th Wettest
Wettest since:
2019
Apr–May 1970
2-Month
5.39"
(136.91mm)
5.43"
(137.92mm)
-0.04"
(-1.01mm)
65th Driest
Driest since:
1934
64th Wettest
Wettest since:
1957
Mar–May 1970
3-Month
8.07"
(204.98mm)
7.94"
(201.68mm)
0.13"
(3.30mm)
76th Driest
Driest since:
1925
53rd Wettest
Wettest since:
1957, 1991
Feb–May 1970
4-Month
9.70"
(246.38mm)
10.07"
(255.78mm)
-0.37"
(-9.40mm)
53rd Driest
Driest since:
1925
76th Wettest
Wettest since:
2019
Ties: 1987
Jan–May 1970
5-Month
11.79"
(299.47mm)
12.39"
(314.71mm)
-0.60"
(-15.24mm)
44th Driest
Driest since:
1934
85th Wettest
Wettest since:
2019
Dec 1969–May 1970
6-Month
14.73"
(374.14mm)
14.73"
(374.14mm)
0.00"
(0.00mm)
63rd Driest
Driest since:
1931
65th Wettest
Wettest since:
2019
Nov 1969–May 1970
7-Month
16.32"
(414.53mm)
16.96"
(430.78mm)
-0.64"
(-16.25mm)
47th Driest
Driest since:
1934
81st Wettest
Wettest since:
1983
Oct 1969–May 1970
8-Month
19.02"
(483.11mm)
19.13"
(485.90mm)
-0.11"
(-2.79mm)
60th Driest
Driest since:
1934
68th Wettest
Wettest since:
2019
Sep 1969–May 1970
9-Month
21.32"
(541.53mm)
21.62"
(549.15mm)
-0.30"
(-7.62mm)
57th Driest
Driest since:
1934
71st Wettest
Wettest since:
2019
Aug 1969–May 1970
10-Month
23.63"
(600.20mm)
24.25"
(615.95mm)
-0.62"
(-15.75mm)
45th Driest
Driest since:
1918
83rd Wettest
Wettest since:
2019
Ties: 1913
Jul 1969–May 1970
11-Month
26.72"
(678.69mm)
27.03"
(686.56mm)
-0.31"
(-7.87mm)
55th Driest
Driest since:
1931
73rd Wettest
Wettest since:
2019
Jun 1969–May 1970
12-Month
30.03"
(762.76mm)
29.95"
(760.73mm)
0.08"
(2.03mm)
59th Driest
Driest since:
1934
69th Wettest
Wettest since:
2019
Dec 1968–May 1970
18-Month
45.24"
(1,149.10mm)
44.70"
(1,135.38mm)
0.54"
(13.72mm)
71st Driest
Driest since:
1931
56th Wettest
Wettest since:
2019
Ties: 1990
Jun 1968–May 1970
24-Month
61.21"
(1,554.73mm)
59.92"
(1,521.97mm)
1.29"
(32.76mm)
79th Driest
Driest since:
1931
48th Wettest
Wettest since:
2020
Ties: 1949
Jun 1967–May 1970
36-Month
91.29"
(2,318.77mm)
89.88"
(2,282.95mm)
1.41"
(35.82mm)
77th Driest
Driest since:
1955
49th Wettest
Wettest since:
2019
Jun 1966–May 1970
48-Month
118.83"
(3,018.28mm)
119.78"
(3,042.41mm)
-0.95"
(-24.13mm)
51st Driest
Driest since:
1956
74th Wettest
Wettest since:
2019
Jun 1965–May 1970
60-Month
147.78"
(3,753.61mm)
149.64"
(3,800.86mm)
-1.86"
(-47.25mm)
45th Driest
Driest since:
1957
79th Wettest
Wettest since:
2020

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