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, May 2022

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  • Record Wettest
PeriodValue1901-2000
Mean		AnomalyRank
(1895-2022)		Wettest/Driest
Since		Record
May 2022
1-Month		3.19"
(81.03mm)		2.91"
(73.91mm)		0.28"
(7.12mm)		91st Driest
Driest since:
1934
38th Wettest
Wettest since:
2019
Ties: 1947
Apr–May 2022
2-Month		5.79"
(147.07mm)		5.43"
(137.92mm)		0.36"
(9.15mm)		88th Driest
Driest since:
1934
41st Wettest
Wettest since:
1957
Ties: 1968
Mar–May 2022
3-Month		8.07"
(204.98mm)		7.94"
(201.68mm)		0.13"
(3.30mm)		76th Driest
Driest since:
1925
53rd Wettest
Wettest since:
1957, 1991
Ties: 1970
Feb–May 2022
4-Month		9.83"
(249.68mm)		10.07"
(255.78mm)		-0.24"
(-6.10mm)		58th Driest
Driest since:
1925
71st Wettest
Wettest since:
2019
Ties: 1959
Jan–May 2022
5-Month		11.47"
(291.34mm)		12.39"
(314.71mm)		-0.92"
(-23.37mm)		27th Driest
Driest since:
1934
102nd Wettest
Wettest since:
2019
Ties: 1972
Dec 2021–May 2022
6-Month		13.87"
(352.30mm)		14.73"
(374.14mm)		-0.86"
(-21.84mm)		38th Driest
Driest since:
1931
90th Wettest
Wettest since:
2019
Ties: 1947, 1987
Nov 2021–May 2022
7-Month		15.17"
(385.32mm)		16.96"
(430.78mm)		-1.79"
(-45.46mm)		12th Driest
Driest since:
1934
116th Wettest
Wettest since:
1983
Oct 2021–May 2022
8-Month		18.32"
(465.33mm)		19.13"
(485.90mm)		-0.81"
(-20.57mm)		39th Driest
Driest since:
1934
89th Wettest
Wettest since:
2019
Sep 2021–May 2022
9-Month		20.71"
(526.03mm)		21.62"
(549.15mm)		-0.91"
(-23.12mm)		37th Driest
Driest since:
1934
91st Wettest
Wettest since:
2019
Aug 2021–May 2022
10-Month		23.85"
(605.79mm)		24.25"
(615.95mm)		-0.40"
(-10.16mm)		54th Driest
Driest since:
1918
74th Wettest
Wettest since:
2019
Ties: 1985
Jul 2021–May 2022
11-Month		27.26"
(692.40mm)		27.03"
(686.56mm)		0.23"
(5.84mm)		67th Driest
Driest since:
1931
61st Wettest
Wettest since:
2019
Jun 2021–May 2022
12-Month		30.23"
(767.84mm)		29.95"
(760.73mm)		0.28"
(7.11mm)		64th Driest
Driest since:
1934
64th Wettest
Wettest since:
2019
Dec 2020–May 2022
18-Month		43.94"
(1,116.08mm)		44.70"
(1,135.38mm)		-0.76"
(-19.30mm)		48th Driest
Driest since:
1931
79th Wettest
Wettest since:
2019
Jun 2020–May 2022
24-Month		58.59"
(1,488.19mm)		59.92"
(1,521.97mm)		-1.33"
(-33.78mm)		37th Driest
Driest since:
1931
90th Wettest
Wettest since:
2020
Jun 2019–May 2022
36-Month		91.33"
(2,319.78mm)		89.88"
(2,282.95mm)		1.45"
(36.83mm)		78th Driest
Driest since:
1955
48th Wettest
Wettest since:
2019
Jun 2018–May 2022
48-Month		129.04"
(3,277.62mm)		119.78"
(3,042.41mm)		9.26"
(235.21mm)		115th Driest
Driest since:
1956
10th Wettest
Wettest since:
2019
Jun 2017–May 2022
60-Month		159.11"
(4,041.39mm)		149.64"
(3,800.86mm)		9.47"
(240.53mm)		111th Driest
Driest since:
1957
13th Wettest
Wettest since:
2020

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