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 2020

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  • Record Wettest
Period Value 1901-2000
Mean		 Anomaly Rank
(1895-2022)		 Wettest/Driest
Since		 Record
July 2020
1-Month 		2.94"
(74.68mm)		 2.78"
(70.61mm)		 0.16"
(4.07mm)		 87th Driest
Driest since:
 1930
42nd Wettest
Wettest since:
 1950, 1958
Ties: 1959, 1990
Jun–Jul 2020
2-Month 		5.67"
(144.02mm)		 5.70"
(144.78mm)		 -0.03"
(-0.76mm)		 52nd Driest
Driest since:
 1930
77th Wettest
Wettest since:
 1928
May–Jul 2020
3-Month 		8.76"
(222.50mm)		 8.62"
(218.95mm)		 0.14"
(3.55mm)		 62nd Driest
Driest since:
 1988
67th Wettest
Wettest since:
 2015
Ties: 1959
Apr–Jul 2020
4-Month 		11.28"
(286.51mm)		 11.13"
(282.70mm)		 0.15"
(3.81mm)		 62nd Driest
Driest since:
 1934
67th Wettest
Wettest since:
 2015
Mar–Jul 2020
5-Month 		14.14"
(359.16mm)		 13.64"
(346.46mm)		 0.50"
(12.70mm)		 77th Driest
Driest since:
 1936
52nd Wettest
Wettest since:
 1973
Feb–Jul 2020
6-Month 		16.59"
(421.39mm)		 15.78"
(400.81mm)		 0.81"
(20.58mm)		 85th Driest
Driest since:
 1934
44th Wettest
Wettest since:
 2019
Jan–Jul 2020
7-Month 		19.35"
(491.49mm)		 18.09"
(459.49mm)		 1.26"
(32.00mm)		 102nd Driest
Driest since:
 1934
27th Wettest
Wettest since:
 2019
Dec 2019–Jul 2020
8-Month 		21.92"
(556.77mm)		 20.44"
(519.18mm)		 1.48"
(37.59mm)		 101st Driest
Driest since:
 1931
27th Wettest
Wettest since:
 2019
Ties: 1950, 2013
Nov 2019–Jul 2020
9-Month 		23.86"
(606.04mm)		 22.66"
(575.56mm)		 1.20"
(30.48mm)		 91st Driest
Driest since:
 1934
37th Wettest
Wettest since:
 2019
Ties: 1919
Oct 2019–Jul 2020
10-Month 		27.05"
(687.07mm)		 24.83"
(630.68mm)		 2.22"
(56.39mm)		 109th Driest
Driest since:
 1934
19th Wettest
Wettest since:
 2019
Sep 2019–Jul 2020
11-Month 		29.50"
(749.30mm)		 27.33"
(694.18mm)		 2.17"
(55.12mm)		 106th Driest
Driest since:
 1934
22nd Wettest
Wettest since:
 2019
Aug 2019–Jul 2020
12-Month 		32.28"
(819.91mm)		 29.95"
(760.73mm)		 2.33"
(59.18mm)		 107th Driest
Driest since:
 1918
21st Wettest
Wettest since:
 2019
Feb 2019–Jul 2020
18-Month 		51.61"
(1,310.89mm)		 45.74"
(1,161.80mm)		 5.87"
(149.09mm)		 125th Driest
Driest since:
 1931
3rd Wettest
Wettest since:
 2019
Aug 2018–Jul 2020
24-Month 		70.11"
(1,780.79mm)		 59.92"
(1,521.97mm)		 10.19"
(258.82mm)		 126th Driest
Driest since:
 1918
1st Wettest
Wettest to Date
 2020
Aug 2017–Jul 2020
36-Month 		100.32"
(2,548.13mm)		 89.88"
(2,282.95mm)		 10.44"
(265.18mm)		 123rd Driest
Driest since:
 1956
3rd Wettest
Wettest since:
 2019
Aug 2016–Jul 2020
48-Month 		134.19"
(3,408.43mm)		 119.78"
(3,042.41mm)		 14.41"
(366.02mm)		 123rd Driest
Driest since:
 1956
2nd Wettest
Wettest since:
 2019
Aug 2015–Jul 2020
60-Month 		167.39"
(4,251.71mm)		 149.64"
(3,800.86mm)		 17.75"
(450.85mm)		 122nd Driest
Driest since:
 1934
2nd Wettest
Wettest since:
 2019

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