National Rankings

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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 1921

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Record Wettest
Period	Value	1901-2000 Mean	Anomaly	Rank (1895-2022)	Wettest/Driest Since	Record
May 1921 1-Month	2.55" (64.77mm)	2.91" (73.91mm)	-0.36" (-9.14mm)	27th Driest	Driest since: 1914	1934
	2.55" (64.77mm)	2.91" (73.91mm)	-0.36" (-9.14mm)	102nd Wettest	Wettest since: 1920	2019
	Ties: 1985
Apr–May 1921 2-Month	5.34" (135.64mm)	5.43" (137.92mm)	-0.09" (-2.28mm)	63rd Driest	Driest since: 1917	1934
	5.34" (135.64mm)	5.43" (137.92mm)	-0.09" (-2.28mm)	66th Wettest	Wettest since: 1920	1957
	Ties: 1959
Mar–May 1921 3-Month	7.86" (199.64mm)	7.94" (201.68mm)	-0.08" (-2.04mm)	61st Driest	Driest since: 1918	1925
Mar–May 1921 3-Month	7.86" (199.64mm)	7.94" (201.68mm)	-0.08" (-2.04mm)	68th Wettest	Wettest since: 1920	1957, 1991
Feb–May 1921 4-Month	9.63" (244.60mm)	10.07" (255.78mm)	-0.44" (-11.18mm)	48th Driest	Driest since: 1918	1925
Feb–May 1921 4-Month	9.63" (244.60mm)	10.07" (255.78mm)	-0.44" (-11.18mm)	81st Wettest	Wettest since: 1920	2019
Jan–May 1921 5-Month	11.74" (298.20mm)	12.39" (314.71mm)	-0.65" (-16.51mm)	41st Driest	Driest since: 1918	1934
Jan–May 1921 5-Month	11.74" (298.20mm)	12.39" (314.71mm)	-0.65" (-16.51mm)	88th Wettest	Wettest since: 1920	2019
Dec 1920–May 1921 6-Month	14.49" (368.05mm)	14.73" (374.14mm)	-0.24" (-6.09mm)	56th Driest	Driest since: 1918	1931
Dec 1920–May 1921 6-Month	14.49" (368.05mm)	14.73" (374.14mm)	-0.24" (-6.09mm)	72nd Wettest	Wettest since: 1920	2019
Nov 1920–May 1921 7-Month	16.75" (425.45mm)	16.96" (430.78mm)	-0.21" (-5.33mm)	59th Driest	Driest since: 1918	1934
	16.75" (425.45mm)	16.96" (430.78mm)	-0.21" (-5.33mm)	69th Wettest	Wettest since: 1920	1983
	Ties: 1900
Oct 1920–May 1921 8-Month	18.92" (480.57mm)	19.13" (485.90mm)	-0.21" (-5.33mm)	55th Driest	Driest since: 1918	1934
Oct 1920–May 1921 8-Month	18.92" (480.57mm)	19.13" (485.90mm)	-0.21" (-5.33mm)	73rd Wettest	Wettest since: 1920	2019
Sep 1920–May 1921 9-Month	21.36" (542.54mm)	21.62" (549.15mm)	-0.26" (-6.61mm)	58th Driest	Driest since: 1918	1934
Sep 1920–May 1921 9-Month	21.36" (542.54mm)	21.62" (549.15mm)	-0.26" (-6.61mm)	70th Wettest	Wettest since: 1920	2019
Aug 1920–May 1921 10-Month	24.76" (628.90mm)	24.25" (615.95mm)	0.51" (12.95mm)	72nd Driest	Driest since: 1918	1918
Aug 1920–May 1921 10-Month	24.76" (628.90mm)	24.25" (615.95mm)	0.51" (12.95mm)	56th Wettest	Wettest since: 1920	2019
Jul 1920–May 1921 11-Month	27.46" (697.48mm)	27.03" (686.56mm)	0.43" (10.92mm)	71st Driest	Driest since: 1918	1931
	27.46" (697.48mm)	27.03" (686.56mm)	0.43" (10.92mm)	57th Wettest	Wettest since: 1920	2019
	Ties: 1947
Jun 1920–May 1921 12-Month	30.35" (770.89mm)	29.95" (760.73mm)	0.40" (10.16mm)	71st Driest	Driest since: 1919	1934
	30.35" (770.89mm)	29.95" (760.73mm)	0.40" (10.16mm)	57th Wettest	Wettest since: 1920	2019
	Ties: 1962
Dec 1919–May 1921 18-Month	44.85" (1,139.19mm)	44.70" (1,135.38mm)	0.15" (3.81mm)	65th Driest	Driest since: 1919	1931
	44.85" (1,139.19mm)	44.70" (1,135.38mm)	0.15" (3.81mm)	62nd Wettest	Wettest since: 1920	2019
	Ties: 1962
Jun 1919–May 1921 24-Month	61.93" (1,573.02mm)	59.92" (1,521.97mm)	2.01" (51.05mm)	90th Driest	Driest since: 1920	1931
Jun 1919–May 1921 24-Month	61.93" (1,573.02mm)	59.92" (1,521.97mm)	2.01" (51.05mm)	37th Wettest	Wettest since: 1916	2020
Jun 1918–May 1921 36-Month	92.19" (2,341.63mm)	89.88" (2,282.95mm)	2.31" (58.68mm)	85th Driest	Driest since: 1920	1955
Jun 1918–May 1921 36-Month	92.19" (2,341.63mm)	89.88" (2,282.95mm)	2.31" (58.68mm)	41st Wettest	Wettest since: 1909	2019
Jun 1917–May 1921 48-Month	117.13" (2,975.10mm)	119.78" (3,042.41mm)	-2.65" (-67.31mm)	36th Driest	Driest since: 1920	1956
Jun 1917–May 1921 48-Month	117.13" (2,975.10mm)	119.78" (3,042.41mm)	-2.65" (-67.31mm)	89th Wettest	Wettest since: 1917	2019
Jun 1916–May 1921 60-Month	145.69" (3,700.53mm)	149.64" (3,800.86mm)	-3.95" (-100.33mm)	30th Driest	Driest since: 1918	1957
Jun 1916–May 1921 60-Month	145.69" (3,700.53mm)	149.64" (3,800.86mm)	-3.95" (-100.33mm)	94th Wettest	Wettest since: 1920	2020

Citing This Page

NOAA National Centers for Environmental information, Climate at a Glance: National Rankings, published November 2022, retrieved on November 28, 2022 from https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/national/rankings