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 1981

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  • Record Wettest
Period Value 1901-2000
Mean		 Anomaly Rank
(1895-2022)		 Wettest/Driest
Since		 Record
May 1981
1-Month 		3.55"
(90.17mm)		 2.91"
(73.91mm)		 0.64"
(16.26mm)		 116th Driest
Driest since:
 1934
13th Wettest
Wettest since:
 2019
Apr–May 1981
2-Month 		5.74"
(145.80mm)		 5.43"
(137.92mm)		 0.31"
(7.88mm)		 83rd Driest
Driest since:
 1934
46th Wettest
Wettest since:
 1957
Mar–May 1981
3-Month 		7.95"
(201.93mm)		 7.94"
(201.68mm)		 0.01"
(0.25mm)		 62nd Driest
Driest since:
 1925
67th Wettest
Wettest since:
 1957, 1991
Ties: 1968
Feb–May 1981
4-Month 		10.12"
(257.05mm)		 10.07"
(255.78mm)		 0.05"
(1.27mm)		 72nd Driest
Driest since:
 1925
57th Wettest
Wettest since:
 2019
Jan–May 1981
5-Month 		11.10"
(281.94mm)		 12.39"
(314.71mm)		 -1.29"
(-32.77mm)		 13th Driest
Driest since:
 1934
116th Wettest
Wettest since:
 2019
Ties: 1911
Dec 1980–May 1981
6-Month 		12.67"
(321.82mm)		 14.73"
(374.14mm)		 -2.06"
(-52.32mm)		 7th Driest
Driest since:
 1931
121st Wettest
Wettest since:
 2019
Nov 1980–May 1981
7-Month 		14.43"
(366.52mm)		 16.96"
(430.78mm)		 -2.53"
(-64.26mm)		 7th Driest
Driest since:
 1934
121st Wettest
Wettest since:
 1983
Oct 1980–May 1981
8-Month 		16.30"
(414.02mm)		 19.13"
(485.90mm)		 -2.83"
(-71.88mm)		 6th Driest
Driest since:
 1934
122nd Wettest
Wettest since:
 2019
Sep 1980–May 1981
9-Month 		19.09"
(484.89mm)		 21.62"
(549.15mm)		 -2.53"
(-64.26mm)		 11th Driest
Driest since:
 1934
117th Wettest
Wettest since:
 2019
Aug 1980–May 1981
10-Month 		21.66"
(550.16mm)		 24.25"
(615.95mm)		 -2.59"
(-65.79mm)		 13th Driest
Driest since:
 1918
115th Wettest
Wettest since:
 2019
Ties: 1955
Jul 1980–May 1981
11-Month 		23.63"
(600.20mm)		 27.03"
(686.56mm)		 -3.40"
(-86.36mm)		 9th Driest
Driest since:
 1931
119th Wettest
Wettest since:
 2019
Jun 1980–May 1981
12-Month 		25.94"
(658.88mm)		 29.95"
(760.73mm)		 -4.01"
(-101.85mm)		 6th Driest
Driest since:
 1934
122nd Wettest
Wettest since:
 2019
Dec 1979–May 1981
18-Month 		41.23"
(1,047.24mm)		 44.70"
(1,135.38mm)		 -3.47"
(-88.14mm)		 17th Driest
Driest since:
 1931
110th Wettest
Wettest since:
 2019
Jun 1979–May 1981
24-Month 		57.11"
(1,450.59mm)		 59.92"
(1,521.97mm)		 -2.81"
(-71.38mm)		 24th Driest
Driest since:
 1931
103rd Wettest
Wettest since:
 2020
Jun 1978–May 1981
36-Month 		88.87"
(2,257.30mm)		 89.88"
(2,282.95mm)		 -1.01"
(-25.65mm)		 48th Driest
Driest since:
 1955
78th Wettest
Wettest since:
 2019
Jun 1977–May 1981
48-Month 		121.85"
(3,094.99mm)		 119.78"
(3,042.41mm)		 2.07"
(52.58mm)		 80th Driest
Driest since:
 1956
45th Wettest
Wettest since:
 2019
Jun 1976–May 1981
60-Month 		147.57"
(3,748.28mm)		 149.64"
(3,800.86mm)		 -2.07"
(-52.58mm)		 43rd Driest
Driest since:
 1957
81st Wettest
Wettest since:
 2020
Ties: 1901

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