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 1977

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  • Record Wettest
Period Value 1901-2000
Mean
Anomaly Rank
(1895-2022)
Wettest/Driest
Since
Record
July 1977
1-Month
2.56"
(65.02mm)
2.78"
(70.61mm)
-0.22"
(-5.59mm)
26th Driest
Driest since:
1930
103rd Wettest
Wettest since:
1950, 1958
Jun–Jul 1977
2-Month
5.05"
(128.27mm)
5.70"
(144.78mm)
-0.65"
(-16.51mm)
20th Driest
Driest since:
1930
109th Wettest
Wettest since:
1928
May–Jul 1977
3-Month
7.72"
(196.09mm)
8.62"
(218.95mm)
-0.90"
(-22.86mm)
24th Driest
Driest since:
1988
105th Wettest
Wettest since:
2015
Apr–Jul 1977
4-Month
9.99"
(253.75mm)
11.13"
(282.70mm)
-1.14"
(-28.95mm)
20th Driest
Driest since:
1934
109th Wettest
Wettest since:
2015
Ties: 1918
Mar–Jul 1977
5-Month
13.09"
(332.49mm)
13.64"
(346.46mm)
-0.55"
(-13.97mm)
39th Driest
Driest since:
1936
90th Wettest
Wettest since:
1973
Feb–Jul 1977
6-Month
14.32"
(363.73mm)
15.78"
(400.81mm)
-1.46"
(-37.08mm)
19th Driest
Driest since:
1934
110th Wettest
Wettest since:
2019
Jan–Jul 1977
7-Month
15.90"
(403.86mm)
18.09"
(459.49mm)
-2.19"
(-55.63mm)
11th Driest
Driest since:
1934
118th Wettest
Wettest since:
2019
Dec 1976–Jul 1977
8-Month
17.26"
(438.40mm)
20.44"
(519.18mm)
-3.18"
(-80.78mm)
4th Driest
Driest since:
1931
124th Wettest
Wettest since:
2019
Nov 1976–Jul 1977
9-Month
18.37"
(466.60mm)
22.66"
(575.56mm)
-4.29"
(-108.96mm)
2nd Driest
Driest since:
1934
126th Wettest
Wettest since:
2019
Oct 1976–Jul 1977
10-Month
20.81"
(528.57mm)
24.83"
(630.68mm)
-4.02"
(-102.11mm)
6th Driest
Driest since:
1934
122nd Wettest
Wettest since:
2019
Sep 1976–Jul 1977
11-Month
23.26"
(590.80mm)
27.33"
(694.18mm)
-4.07"
(-103.38mm)
6th Driest
Driest since:
1934
122nd Wettest
Wettest since:
2019
Aug 1976–Jul 1977
12-Month
25.26"
(641.60mm)
29.95"
(760.73mm)
-4.69"
(-119.13mm)
4th Driest
Driest since:
1918
124th Wettest
Wettest since:
2019
Feb 1976–Jul 1977
18-Month
40.45"
(1,027.43mm)
45.74"
(1,161.80mm)
-5.29"
(-134.37mm)
7th Driest
Driest since:
1931
121st Wettest
Wettest since:
2019
Aug 1975–Jul 1977
24-Month
54.39"
(1,381.51mm)
59.92"
(1,521.97mm)
-5.53"
(-140.46mm)
10th Driest
Driest since:
1918
117th Wettest
Wettest since:
2020
Aug 1974–Jul 1977
36-Month
88.00"
(2,235.20mm)
89.88"
(2,282.95mm)
-1.88"
(-47.75mm)
40th Driest
Driest since:
1956
86th Wettest
Wettest since:
2019
Aug 1973–Jul 1977
48-Month
120.01"
(3,048.25mm)
119.78"
(3,042.41mm)
0.23"
(5.84mm)
60th Driest
Driest since:
1956
65th Wettest
Wettest since:
2019
Aug 1972–Jul 1977
60-Month
155.02"
(3,937.51mm)
149.64"
(3,800.86mm)
5.38"
(136.65mm)
97th Driest
Driest since:
1934
27th Wettest
Wettest since:
2019

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