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 1978

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  • Record Wettest
PeriodValue1901-2000
Mean		AnomalyRank
(1895-2022)		Wettest/Driest
Since		Record
July 1978
1-Month		2.75"
(69.85mm)		2.78"
(70.61mm)		-0.03"
(-0.76mm)		56th Driest
Driest since:
1930
73rd Wettest
Wettest since:
1950, 1958
Ties: 1986
Jun–Jul 1978
2-Month		5.30"
(134.62mm)		5.70"
(144.78mm)		-0.40"
(-10.16mm)		29th Driest
Driest since:
1930
100th Wettest
Wettest since:
1928
Ties: 1914
May–Jul 1978
3-Month		8.94"
(227.08mm)		8.62"
(218.95mm)		0.32"
(8.13mm)		75th Driest
Driest since:
1988
54th Wettest
Wettest since:
2015
Apr–Jul 1978
4-Month		11.48"
(291.59mm)		11.13"
(282.70mm)		0.35"
(8.89mm)		73rd Driest
Driest since:
1934
56th Wettest
Wettest since:
2015
Mar–Jul 1978
5-Month		13.74"
(349.00mm)		13.64"
(346.46mm)		0.10"
(2.54mm)		59th Driest
Driest since:
1936
70th Wettest
Wettest since:
1973
Feb–Jul 1978
6-Month		15.51"
(393.95mm)		15.78"
(400.81mm)		-0.27"
(-6.86mm)		53rd Driest
Driest since:
1934
76th Wettest
Wettest since:
2019
Jan–Jul 1978
7-Month		18.69"
(474.73mm)		18.09"
(459.49mm)		0.60"
(15.24mm)		81st Driest
Driest since:
1934
48th Wettest
Wettest since:
2019
Ties: 1923
Dec 1977–Jul 1978
8-Month		21.41"
(543.81mm)		20.44"
(519.18mm)		0.97"
(24.63mm)		90th Driest
Driest since:
1931
38th Wettest
Wettest since:
2019
Ties: 1941
Nov 1977–Jul 1978
9-Month		24.27"
(616.46mm)		22.66"
(575.56mm)		1.61"
(40.90mm)		102nd Driest
Driest since:
1934
26th Wettest
Wettest since:
2019
Oct 1977–Jul 1978
10-Month		26.46"
(672.08mm)		24.83"
(630.68mm)		1.63"
(41.40mm)		97th Driest
Driest since:
1934
31st Wettest
Wettest since:
2019
Sep 1977–Jul 1978
11-Month		29.68"
(753.87mm)		27.33"
(694.18mm)		2.35"
(59.69mm)		111th Driest
Driest since:
1934
17th Wettest
Wettest since:
2019
Aug 1977–Jul 1978
12-Month		33.23"
(844.04mm)		29.95"
(760.73mm)		3.28"
(83.31mm)		116th Driest
Driest since:
1918
12th Wettest
Wettest since:
2019
Feb 1977–Jul 1978
18-Month		47.55"
(1,207.77mm)		45.74"
(1,161.80mm)		1.81"
(45.97mm)		89th Driest
Driest since:
1931
39th Wettest
Wettest since:
2019
Aug 1976–Jul 1978
24-Month		58.49"
(1,485.65mm)		59.92"
(1,521.97mm)		-1.43"
(-36.32mm)		42nd Driest
Driest since:
1918
85th Wettest
Wettest since:
2020
Aug 1975–Jul 1978
36-Month		87.62"
(2,225.55mm)		89.88"
(2,282.95mm)		-2.26"
(-57.40mm)		36th Driest
Driest since:
1956
90th Wettest
Wettest since:
2019
Aug 1974–Jul 1978
48-Month		121.23"
(3,079.24mm)		119.78"
(3,042.41mm)		1.45"
(36.83mm)		70th Driest
Driest since:
1956
55th Wettest
Wettest since:
2019
Aug 1973–Jul 1978
60-Month		153.24"
(3,892.30mm)		149.64"
(3,800.86mm)		3.60"
(91.44mm)		84th Driest
Driest since:
1934
40th Wettest
Wettest since:
2019

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