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 1899

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  • Record Wettest
PeriodValue1901-2000
Mean		AnomalyRank
(1895-2023)		Wettest/Driest
Since		Record
May 1899
1-Month		2.74"
(69.60mm)		2.91"
(73.91mm)		-0.17"
(-4.31mm)		47th Driest
Driest since:
1934
83rd Wettest
Wettest since:
2019
Apr–May 1899
2-Month		4.52"
(114.81mm)		5.43"
(137.92mm)		-0.91"
(-23.11mm)		9th Driest
Driest to Date
1934
121st Wettest
Wettest since:
1957
Ties: 1985
Mar–May 1899
3-Month		7.34"
(186.44mm)		7.94"
(201.68mm)		-0.60"
(-15.24mm)		31st Driest
Driest since:
1925
99th Wettest
Wettest since:
1957, 1991
Ties: 1972
Feb–May 1899
4-Month		9.62"
(244.35mm)		10.07"
(255.78mm)		-0.45"
(-11.43mm)		47th Driest
Driest since:
1925
83rd Wettest
Wettest since:
2019
Jan–May 1899
5-Month		12.23"
(310.64mm)		12.39"
(314.71mm)		-0.16"
(-4.07mm)		60th Driest
Driest since:
1934
70th Wettest
Wettest since:
2019
Dec 1898–May 1899
6-Month		13.95"
(354.33mm)		14.73"
(374.14mm)		-0.78"
(-19.81mm)		42nd Driest
Driest to Date
1931
87th Wettest
Wettest since:
2019
Ties: 1914
Nov 1898–May 1899
7-Month		16.21"
(411.73mm)		16.96"
(430.78mm)		-0.75"
(-19.05mm)		43rd Driest
Driest to Date
1934
86th Wettest
Wettest since:
1983
Oct 1898–May 1899
8-Month		18.71"
(475.23mm)		19.13"
(485.90mm)		-0.42"
(-10.67mm)		50th Driest
Driest since:
1934
79th Wettest
Wettest since:
2019
Sep 1898–May 1899
9-Month		21.04"
(534.42mm)		21.62"
(549.15mm)		-0.58"
(-14.73mm)		47th Driest
Driest since:
1934
82nd Wettest
Wettest since:
2019
Aug 1898–May 1899
10-Month		24.10"
(612.14mm)		24.25"
(615.95mm)		-0.15"
(-3.81mm)		60th Driest
Driest since:
1918
69th Wettest
Wettest since:
2019
Jul 1898–May 1899
11-Month		26.98"
(685.29mm)		27.03"
(686.56mm)		-0.05"
(-1.27mm)		60th Driest
Driest since:
1931
69th Wettest
Wettest since:
2019
Ties: 1965
Jun 1898–May 1899
12-Month		30.05"
(763.27mm)		29.95"
(760.73mm)		0.10"
(2.54mm)		61st Driest
Driest since:
1934
68th Wettest
Wettest since:
2019
Dec 1897–May 1899
18-Month		44.36"
(1,126.74mm)		44.70"
(1,135.38mm)		-0.34"
(-8.64mm)		56th Driest
Driest since:
1931
72nd Wettest
Wettest since:
2019
Ties: 1915
Jun 1897–May 1899
24-Month		58.16"
(1,477.26mm)		59.92"
(1,521.97mm)		-1.76"
(-44.71mm)		33rd Driest
Driest to Date
1931
95th Wettest
Wettest since:
2020
Jun 1896–May 1899
36-Month		88.86"
(2,257.04mm)		89.88"
(2,282.95mm)		-1.02"
(-25.91mm)		48th Driest
Driest since:
1955
79th Wettest
Wettest to Date
2019
Jun 1895–May 1899
48-Month		117.23"
(2,977.64mm)		119.78"
(3,042.41mm)		-2.55"
(-64.77mm)		37th Driest
Driest to Date
1956
89th Wettest
Wettest to Date
2019

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