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 1987

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Record Wettest
Period	Value	1901-2000 Mean	Anomaly	Rank (1895-2022)	Wettest/Driest Since	Record
May 1987 1-Month	3.24" (82.30mm)	2.91" (73.91mm)	0.33" (8.39mm)	97th Driest	Driest since: 1986	1934
	3.24" (82.30mm)	2.91" (73.91mm)	0.33" (8.39mm)	32nd Wettest	Wettest since: 1983	2019
	Ties: 1938
Apr–May 1987 2-Month	4.70" (119.38mm)	5.43" (137.92mm)	-0.73" (-18.54mm)	18th Driest	Driest since: 1985	1934
Apr–May 1987 2-Month	4.70" (119.38mm)	5.43" (137.92mm)	-0.73" (-18.54mm)	111th Wettest	Wettest since: 1986	1957
Mar–May 1987 3-Month	7.37" (187.20mm)	7.94" (201.68mm)	-0.57" (-14.48mm)	33rd Driest	Driest since: 1986	1925
Mar–May 1987 3-Month	7.37" (187.20mm)	7.94" (201.68mm)	-0.57" (-14.48mm)	96th Wettest	Wettest since: 1984	1957, 1991
Feb–May 1987 4-Month	9.70" (246.38mm)	10.07" (255.78mm)	-0.37" (-9.40mm)	53rd Driest	Driest since: 1985	1925
	9.70" (246.38mm)	10.07" (255.78mm)	-0.37" (-9.40mm)	76th Wettest	Wettest since: 1986	2019
	Ties: 1970
Jan–May 1987 5-Month	11.87" (301.50mm)	12.39" (314.71mm)	-0.52" (-13.21mm)	48th Driest	Driest since: 1986	1934
Jan–May 1987 5-Month	11.87" (301.50mm)	12.39" (314.71mm)	-0.52" (-13.21mm)	81st Wettest	Wettest since: 1984	2019
Dec 1986–May 1987 6-Month	13.87" (352.30mm)	14.73" (374.14mm)	-0.86" (-21.84mm)	39th Driest	Driest since: 1986	1931
	13.87" (352.30mm)	14.73" (374.14mm)	-0.86" (-21.84mm)	89th Wettest	Wettest since: 1984	2019
	Ties: 1947
Nov 1986–May 1987 7-Month	16.81" (426.97mm)	16.96" (430.78mm)	-0.15" (-3.81mm)	62nd Driest	Driest since: 1986	1934
Nov 1986–May 1987 7-Month	16.81" (426.97mm)	16.96" (430.78mm)	-0.15" (-3.81mm)	66th Wettest	Wettest since: 1984	1983
Oct 1986–May 1987 8-Month	19.62" (498.35mm)	19.13" (485.90mm)	0.49" (12.45mm)	77th Driest	Driest since: 1986	1934
	19.62" (498.35mm)	19.13" (485.90mm)	0.49" (12.45mm)	51st Wettest	Wettest since: 1986	2019
	Ties: 1946, 1986
Sep 1986–May 1987 9-Month	23.21" (589.53mm)	21.62" (549.15mm)	1.59" (40.38mm)	104th Driest	Driest since: 1986	1934
	23.21" (589.53mm)	21.62" (549.15mm)	1.59" (40.38mm)	24th Wettest	Wettest since: 1984	2019
	Ties: 1919, 1999
Aug 1986–May 1987 10-Month	26.03" (661.16mm)	24.25" (615.95mm)	1.78" (45.21mm)	103rd Driest	Driest since: 1986	1918
Aug 1986–May 1987 10-Month	26.03" (661.16mm)	24.25" (615.95mm)	1.78" (45.21mm)	25th Wettest	Wettest since: 1984	2019
Jul 1986–May 1987 11-Month	28.78" (731.01mm)	27.03" (686.56mm)	1.75" (44.45mm)	102nd Driest	Driest since: 1986	1931
Jul 1986–May 1987 11-Month	28.78" (731.01mm)	27.03" (686.56mm)	1.75" (44.45mm)	26th Wettest	Wettest since: 1984	2019
Jun 1986–May 1987 12-Month	31.81" (807.97mm)	29.95" (760.73mm)	1.86" (47.24mm)	98th Driest	Driest since: 1986	1934
	31.81" (807.97mm)	29.95" (760.73mm)	1.86" (47.24mm)	30th Wettest	Wettest since: 1984	2019
	Ties: 1999
Dec 1985–May 1987 18-Month	44.71" (1,135.63mm)	44.70" (1,135.38mm)	0.01" (0.25mm)	62nd Driest	Driest since: 1986	1931
Dec 1985–May 1987 18-Month	44.71" (1,135.63mm)	44.70" (1,135.38mm)	0.01" (0.25mm)	65th Wettest	Wettest since: 1985	2019
Jun 1985–May 1987 24-Month	62.70" (1,592.58mm)	59.92" (1,521.97mm)	2.78" (70.61mm)	99th Driest	Driest since: 1986	1931
Jun 1985–May 1987 24-Month	62.70" (1,592.58mm)	59.92" (1,521.97mm)	2.78" (70.61mm)	28th Wettest	Wettest since: 1984	2020
Jun 1984–May 1987 36-Month	92.31" (2,344.67mm)	89.88" (2,282.95mm)	2.43" (61.72mm)	86th Driest	Driest since: 1982	1955
Jun 1984–May 1987 36-Month	92.31" (2,344.67mm)	89.88" (2,282.95mm)	2.43" (61.72mm)	40th Wettest	Wettest since: 1986	2019
Jun 1983–May 1987 48-Month	124.25" (3,155.95mm)	119.78" (3,042.41mm)	4.47" (113.54mm)	98th Driest	Driest since: 1982	1956
Jun 1983–May 1987 48-Month	124.25" (3,155.95mm)	119.78" (3,042.41mm)	4.47" (113.54mm)	27th Wettest	Wettest since: 1986	2019
Jun 1982–May 1987 60-Month	159.72" (4,056.89mm)	149.64" (3,800.86mm)	10.08" (256.03mm)	113th Driest	Driest since: 1985	1957
Jun 1982–May 1987 60-Month	159.72" (4,056.89mm)	149.64" (3,800.86mm)	10.08" (256.03mm)	11th Wettest	Wettest since: 1986	2020

Citing This Page

NOAA National Centers for Environmental information, Climate at a Glance: National Rankings, published March 2023, retrieved on March 26, 2023 from https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/national/rankings