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, July 1987

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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
July 1987
1-Month
2.83"
(71.88mm)
2.78"
(70.61mm)
0.05"
(1.27mm)
66th Driest
Driest since:
1930
63rd Wettest
Wettest since:
1950, 1958
Ties: 1933, 1984
Jun–Jul 1987
2-Month
5.64"
(143.26mm)
5.70"
(144.78mm)
-0.06"
(-1.52mm)
50th Driest
Driest since:
1930
79th Wettest
Wettest since:
1928
May–Jul 1987
3-Month
8.88"
(225.55mm)
8.62"
(218.95mm)
0.26"
(6.60mm)
71st Driest
Driest since:
1988
58th Wettest
Wettest since:
2015
Apr–Jul 1987
4-Month
10.34"
(262.64mm)
11.13"
(282.70mm)
-0.79"
(-20.06mm)
30th Driest
Driest since:
1934
99th Wettest
Wettest since:
2015
Mar–Jul 1987
5-Month
13.01"
(330.45mm)
13.64"
(346.46mm)
-0.63"
(-16.01mm)
34th Driest
Driest since:
1936
95th Wettest
Wettest since:
1973
Ties: 1940
Feb–Jul 1987
6-Month
15.34"
(389.64mm)
15.78"
(400.81mm)
-0.44"
(-11.17mm)
46th Driest
Driest since:
1934
83rd Wettest
Wettest since:
2019
Jan–Jul 1987
7-Month
17.51"
(444.75mm)
18.09"
(459.49mm)
-0.58"
(-14.74mm)
39th Driest
Driest since:
1934
90th Wettest
Wettest since:
2019
Dec 1986–Jul 1987
8-Month
19.51"
(495.55mm)
20.43"
(518.92mm)
-0.92"
(-23.37mm)
35th Driest
Driest since:
1931
93rd Wettest
Wettest since:
2019
Nov 1986–Jul 1987
9-Month
22.45"
(570.23mm)
22.66"
(575.56mm)
-0.21"
(-5.33mm)
53rd Driest
Driest since:
1934
75th Wettest
Wettest since:
2019
Oct 1986–Jul 1987
10-Month
25.26"
(641.60mm)
24.83"
(630.68mm)
0.43"
(10.92mm)
71st Driest
Driest since:
1934
57th Wettest
Wettest since:
2019
Ties: 1900
Sep 1986–Jul 1987
11-Month
28.85"
(732.79mm)
27.33"
(694.18mm)
1.52"
(38.61mm)
96th Driest
Driest since:
1934
32nd Wettest
Wettest since:
2019
Aug 1986–Jul 1987
12-Month
31.67"
(804.42mm)
29.95"
(760.73mm)
1.72"
(43.69mm)
95th Driest
Driest since:
1918
33rd Wettest
Wettest since:
2019
Feb 1986–Jul 1987
18-Month
47.44"
(1,204.98mm)
45.74"
(1,161.80mm)
1.70"
(43.18mm)
87th Driest
Driest since:
1931
41st Wettest
Wettest since:
2019
Aug 1985–Jul 1987
24-Month
63.00"
(1,600.20mm)
59.92"
(1,521.97mm)
3.08"
(78.23mm)
100th Driest
Driest since:
1918
27th Wettest
Wettest since:
2020
Aug 1984–Jul 1987
36-Month
92.19"
(2,341.63mm)
89.88"
(2,282.95mm)
2.31"
(58.68mm)
84th Driest
Driest since:
1956
42nd Wettest
Wettest since:
2019
Aug 1983–Jul 1987
48-Month
124.86"
(3,171.44mm)
119.78"
(3,042.41mm)
5.08"
(129.03mm)
100th Driest
Driest since:
1956
25th Wettest
Wettest since:
2019
Aug 1982–Jul 1987
60-Month
159.10"
(4,041.14mm)
149.64"
(3,800.86mm)
9.46"
(240.28mm)
111th Driest
Driest since:
1934
13th Wettest
Wettest since:
2019

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