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 1918

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  • Record Wettest
PeriodValue1901-2000
Mean		AnomalyRank
(1895-2022)		Wettest/Driest
Since		Record
May 1918
1-Month		2.59"
(65.79mm)		2.91"
(73.91mm)		-0.32"
(-8.12mm)		29th Driest
Driest since:
1934
100th Wettest
Wettest since:
2019
Ties: 1904, 1910
Apr–May 1918
2-Month		5.41"
(137.41mm)		5.43"
(137.92mm)		-0.02"
(-0.51mm)		68th Driest
Driest since:
1934
61st Wettest
Wettest since:
1957
Ties: 1946, 1955
Mar–May 1918
3-Month		7.26"
(184.40mm)		7.94"
(201.68mm)		-0.68"
(-17.28mm)		29th Driest
Driest since:
1925
100th Wettest
Wettest since:
1957, 1991
Feb–May 1918
4-Month		8.98"
(228.09mm)		10.07"
(255.78mm)		-1.09"
(-27.69mm)		19th Driest
Driest since:
1925
110th Wettest
Wettest since:
2019
Jan–May 1918
5-Month		11.39"
(289.31mm)		12.39"
(314.71mm)		-1.00"
(-25.40mm)		24th Driest
Driest since:
1934
105th Wettest
Wettest since:
2019
Dec 1917–May 1918
6-Month		13.05"
(331.47mm)		14.73"
(374.14mm)		-1.68"
(-42.67mm)		13th Driest
Driest since:
1931
115th Wettest
Wettest since:
2019
Nov 1917–May 1918
7-Month		14.00"
(355.60mm)		16.96"
(430.78mm)		-2.96"
(-75.18mm)		5th Driest
Driest to Date
1934
123rd Wettest
Wettest since:
1983
Oct 1917–May 1918
8-Month		15.38"
(390.65mm)		19.13"
(485.90mm)		-3.75"
(-95.25mm)		3rd Driest
Driest to Date
1934
125th Wettest
Wettest since:
2019
Sep 1917–May 1918
9-Month		17.55"
(445.77mm)		21.62"
(549.15mm)		-4.07"
(-103.38mm)		2nd Driest
Driest to Date
1934
126th Wettest
Wettest since:
2019
Aug 1917–May 1918
10-Month		19.99"
(507.75mm)		24.25"
(615.95mm)		-4.26"
(-108.20mm)		1st Driest
Driest to Date
1918
127th Wettest
Wettest since:
2019
Jul 1917–May 1918
11-Month		22.50"
(571.50mm)		27.03"
(686.56mm)		-4.53"
(-115.06mm)		2nd Driest
Driest to Date
1931
126th Wettest
Wettest since:
2019
Jun 1917–May 1918
12-Month		24.94"
(633.48mm)		29.95"
(760.73mm)		-5.01"
(-127.25mm)		3rd Driest
Driest to Date
1934
125th Wettest
Wettest since:
2019
Dec 1916–May 1918
18-Month		38.92"
(988.57mm)		44.70"
(1,135.38mm)		-5.78"
(-146.81mm)		3rd Driest
Driest since:
1931
124th Wettest
Wettest since:
2019
Jun 1916–May 1918
24-Month		53.50"
(1,358.90mm)		59.92"
(1,521.97mm)		-6.42"
(-163.07mm)		4th Driest
Driest to Date
1931
123rd Wettest
Wettest since:
2020
Jun 1915–May 1918
36-Month		85.69"
(2,176.53mm)		89.88"
(2,282.95mm)		-4.19"
(-106.42mm)		19th Driest
Driest since:
1955
107th Wettest
Wettest since:
2019
Jun 1914–May 1918
48-Month		116.10"
(2,948.94mm)		119.78"
(3,042.41mm)		-3.68"
(-93.47mm)		29th Driest
Driest since:
1956
96th Wettest
Wettest since:
2019
Jun 1913–May 1918
60-Month		145.26"
(3,689.60mm)		149.64"
(3,800.86mm)		-4.38"
(-111.26mm)		28th Driest
Driest since:
1957
96th Wettest
Wettest since:
2020
Ties: 1939

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