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
PeriodValue1901-2000
Mean		AnomalyRank
(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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