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 2018

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  • Record Wettest
PeriodValue1901-2000
Mean		AnomalyRank
(1895-2022)		Wettest/Driest
Since		Record
July 2018
1-Month		2.86"
(72.64mm)		2.78"
(70.61mm)		0.08"
(2.03mm)		74th Driest
Driest since:
1930
55th Wettest
Wettest since:
1950, 1958
Ties: 1911, 1921, 1926, 1989, 1998
Jun–Jul 2018
2-Month		6.01"
(152.65mm)		5.70"
(144.78mm)		0.31"
(7.87mm)		88th Driest
Driest since:
1930
41st Wettest
Wettest since:
1928
Ties: 1919, 1973
May–Jul 2018
3-Month		9.03"
(229.36mm)		8.62"
(218.95mm)		0.41"
(10.41mm)		80th Driest
Driest since:
1988
49th Wettest
Wettest since:
2015
Apr–Jul 2018
4-Month		11.49"
(291.85mm)		11.13"
(282.70mm)		0.36"
(9.15mm)		74th Driest
Driest since:
1934
55th Wettest
Wettest since:
2015
Mar–Jul 2018
5-Month		13.97"
(354.84mm)		13.64"
(346.46mm)		0.33"
(8.38mm)		72nd Driest
Driest since:
1936
57th Wettest
Wettest since:
1973
Ties: 1897
Feb–Jul 2018
6-Month		16.86"
(428.24mm)		15.78"
(400.81mm)		1.08"
(27.43mm)		99th Driest
Driest since:
1934
30th Wettest
Wettest since:
2019
Ties: 2004
Jan–Jul 2018
7-Month		18.71"
(475.23mm)		18.09"
(459.49mm)		0.62"
(15.74mm)		82nd Driest
Driest since:
1934
47th Wettest
Wettest since:
2019
Dec 2017–Jul 2018
8-Month		20.30"
(515.62mm)		20.44"
(519.18mm)		-0.14"
(-3.56mm)		55th Driest
Driest since:
1931
73rd Wettest
Wettest since:
2019
Nov 2017–Jul 2018
9-Month		21.92"
(556.77mm)		22.66"
(575.56mm)		-0.74"
(-18.79mm)		41st Driest
Driest since:
1934
87th Wettest
Wettest since:
2019
Ties: 1964
Oct 2017–Jul 2018
10-Month		24.52"
(622.81mm)		24.83"
(630.68mm)		-0.31"
(-7.87mm)		50th Driest
Driest since:
1934
78th Wettest
Wettest since:
2019
Sep 2017–Jul 2018
11-Month		26.79"
(680.47mm)		27.33"
(694.18mm)		-0.54"
(-13.71mm)		47th Driest
Driest since:
1934
81st Wettest
Wettest since:
2019
Aug 2017–Jul 2018
12-Month		30.21"
(767.33mm)		29.95"
(760.73mm)		0.26"
(6.60mm)		59th Driest
Driest since:
1918
69th Wettest
Wettest since:
2019
Ties: 1929
Feb 2017–Jul 2018
18-Month		47.78"
(1,213.61mm)		45.74"
(1,161.80mm)		2.04"
(51.81mm)		92nd Driest
Driest since:
1931
36th Wettest
Wettest since:
2019
Aug 2016–Jul 2018
24-Month		64.08"
(1,627.63mm)		59.92"
(1,521.97mm)		4.16"
(105.66mm)		108th Driest
Driest since:
1918
19th Wettest
Wettest since:
2020
Aug 2015–Jul 2018
36-Month		97.28"
(2,470.91mm)		89.88"
(2,282.95mm)		7.40"
(187.96mm)		115th Driest
Driest since:
1956
11th Wettest
Wettest since:
2019
Aug 2014–Jul 2018
48-Month		129.93"
(3,300.22mm)		119.78"
(3,042.41mm)		10.15"
(257.81mm)		119th Driest
Driest since:
1956
6th Wettest
Wettest since:
2019
Aug 2013–Jul 2018
60-Month		159.90"
(4,061.46mm)		149.64"
(3,800.86mm)		10.26"
(260.60mm)		114th Driest
Driest since:
1934
10th Wettest
Wettest since:
2019

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