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 1901

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  • Record Wettest
PeriodValue1901-2000
Mean		AnomalyRank
(1895-2022)		Wettest/Driest
Since		Record
May 1901
1-Month		2.66"
(67.56mm)		2.91"
(73.91mm)		-0.25"
(-6.35mm)		37th Driest
Driest since:
1934
92nd Wettest
Wettest since:
2019
Ties: 1969, 2000
Apr–May 1901
2-Month		5.19"
(131.83mm)		5.43"
(137.92mm)		-0.24"
(-6.09mm)		45th Driest
Driest since:
1934
84th Wettest
Wettest since:
1957
Ties: 1986, 1998
Mar–May 1901
3-Month		7.48"
(189.99mm)		7.94"
(201.68mm)		-0.46"
(-11.69mm)		39th Driest
Driest since:
1925
90th Wettest
Wettest since:
1957, 1991
Ties: 1959
Feb–May 1901
4-Month		9.61"
(244.09mm)		10.07"
(255.78mm)		-0.46"
(-11.69mm)		44th Driest
Driest since:
1925
85th Wettest
Wettest since:
2019
Ties: 1917, 1955
Jan–May 1901
5-Month		11.60"
(294.64mm)		12.39"
(314.71mm)		-0.79"
(-20.07mm)		33rd Driest
Driest since:
1934
96th Wettest
Wettest since:
2019
Ties: 1968
Dec 1900–May 1901
6-Month		13.26"
(336.80mm)		14.73"
(374.14mm)		-1.47"
(-37.34mm)		17th Driest
Driest to Date
1931
111th Wettest
Wettest since:
2019
Nov 1900–May 1901
7-Month		15.63"
(397.00mm)		16.96"
(430.78mm)		-1.33"
(-33.78mm)		26th Driest
Driest to Date
1934
102nd Wettest
Wettest since:
1983
Oct 1900–May 1901
8-Month		18.38"
(466.85mm)		19.13"
(485.90mm)		-0.75"
(-19.05mm)		40th Driest
Driest since:
1934
88th Wettest
Wettest since:
2019
Sep 1900–May 1901
9-Month		21.31"
(541.27mm)		21.62"
(549.15mm)		-0.31"
(-7.88mm)		56th Driest
Driest since:
1934
72nd Wettest
Wettest since:
2019
Aug 1900–May 1901
10-Month		23.73"
(602.74mm)		24.25"
(615.95mm)		-0.52"
(-13.21mm)		50th Driest
Driest since:
1918
78th Wettest
Wettest since:
2019
Jul 1900–May 1901
11-Month		26.80"
(680.72mm)		27.03"
(686.56mm)		-0.23"
(-5.84mm)		56th Driest
Driest since:
1931
72nd Wettest
Wettest since:
2019
Ties: 1905
Jun 1900–May 1901
12-Month		29.83"
(757.68mm)		29.95"
(760.73mm)		-0.12"
(-3.05mm)		56th Driest
Driest since:
1934
72nd Wettest
Wettest since:
2019
Dec 1899–May 1901
18-Month		44.59"
(1,132.59mm)		44.70"
(1,135.38mm)		-0.11"
(-2.79mm)		58th Driest
Driest since:
1931
69th Wettest
Wettest since:
2019
Jun 1899–May 1901
24-Month		58.71"
(1,491.23mm)		59.92"
(1,521.97mm)		-1.21"
(-30.74mm)		39th Driest
Driest since:
1931
88th Wettest
Wettest since:
2020
Jun 1898–May 1901
36-Month		88.76"
(2,254.50mm)		89.88"
(2,282.95mm)		-1.12"
(-28.45mm)		45th Driest
Driest since:
1955
81st Wettest
Wettest since:
2019
Jun 1897–May 1901
48-Month		116.87"
(2,968.50mm)		119.78"
(3,042.41mm)		-2.91"
(-73.91mm)		35th Driest
Driest to Date
1956
90th Wettest
Wettest since:
2019
Jun 1896–May 1901
60-Month		147.57"
(3,748.28mm)		149.64"
(3,800.86mm)		-2.07"
(-52.58mm)		43rd Driest
Driest since:
1957
81st Wettest
Wettest to Date
2020
Ties: 1981

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