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 1900

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Period Value 1901-2000
Mean
Anomaly Rank
(1895-2022)
Wettest/Driest
Since
Record
July 1900
1-Month
3.07"
(77.98mm)
2.78"
(70.61mm)
0.29"
(7.37mm)
105th Driest
Driest since:
1930
24th Wettest
Wettest since:
1950, 1958
Ties: 1928, 2009
Jun–Jul 1900
2-Month
6.10"
(154.94mm)
5.70"
(144.78mm)
0.40"
(10.16mm)
95th Driest
Driest since:
1930
34th Wettest
Wettest to Date
1928
May–Jul 1900
3-Month
8.55"
(217.17mm)
8.62"
(218.95mm)
-0.07"
(-1.78mm)
51st Driest
Driest since:
1988
78th Wettest
Wettest since:
2015
Apr–Jul 1900
4-Month
11.96"
(303.78mm)
11.13"
(282.70mm)
0.83"
(21.08mm)
97th Driest
Driest since:
1934
32nd Wettest
Wettest to Date
2015
Ties: 2014
Mar–Jul 1900
5-Month
14.24"
(361.70mm)
13.64"
(346.46mm)
0.60"
(15.24mm)
79th Driest
Driest since:
1936
50th Wettest
Wettest to Date
1973
Ties: 1943
Feb–Jul 1900
6-Month
16.76"
(425.70mm)
15.78"
(400.81mm)
0.98"
(24.89mm)
95th Driest
Driest since:
1934
34th Wettest
Wettest since:
2019
Ties: 1897, 2011
Jan–Jul 1900
7-Month
18.50"
(469.90mm)
18.09"
(459.49mm)
0.41"
(10.41mm)
75th Driest
Driest since:
1934
54th Wettest
Wettest since:
2019
Dec 1899–Jul 1900
8-Month
20.86"
(529.84mm)
20.44"
(519.18mm)
0.42"
(10.66mm)
71st Driest
Driest since:
1931
57th Wettest
Wettest to Date
2019
Ties: 2011
Nov 1899–Jul 1900
9-Month
22.85"
(580.39mm)
22.66"
(575.56mm)
0.19"
(4.83mm)
64th Driest
Driest since:
1934
64th Wettest
Wettest since:
2019
Oct 1899–Jul 1900
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: 1987
Sep 1899–Jul 1900
11-Month
26.80"
(680.72mm)
27.33"
(694.18mm)
-0.53"
(-13.46mm)
48th Driest
Driest since:
1934
80th Wettest
Wettest since:
2019
Aug 1899–Jul 1900
12-Month
29.06"
(738.12mm)
29.95"
(760.73mm)
-0.89"
(-22.61mm)
40th Driest
Driest since:
1918
88th Wettest
Wettest since:
2019
Feb 1899–Jul 1900
18-Month
44.60"
(1,132.84mm)
45.74"
(1,161.80mm)
-1.14"
(-28.96mm)
41st Driest
Driest since:
1931
87th Wettest
Wettest since:
2019
Aug 1898–Jul 1900
24-Month
59.08"
(1,500.63mm)
59.92"
(1,521.97mm)
-0.84"
(-21.34mm)
52nd Driest
Driest since:
1918
75th Wettest
Wettest to Date
2020
Aug 1897–Jul 1900
36-Month
87.33"
(2,218.18mm)
89.88"
(2,282.95mm)
-2.55"
(-64.77mm)
31st Driest
Driest since:
1956
95th Wettest
Wettest since:
2019
Ties: 1967
Aug 1896–Jul 1900
48-Month
117.98"
(2,996.69mm)
119.78"
(3,042.41mm)
-1.80"
(-45.72mm)
41st Driest
Driest since:
1956
84th Wettest
Wettest to Date
2019
Aug 1895–Jul 1900
60-Month
146.26"
(3,715.00mm)
149.64"
(3,800.86mm)
-3.38"
(-85.86mm)
31st Driest
Driest to Date
1934
93rd Wettest
Wettest to Date
2019

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