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 Driest
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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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