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, April 2018

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Record Driest

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Record Wettest
Period	Value	1901-2000 Mean	Anomaly	Rank (1895-2022)	Wettest/Driest Since	Record
April 2018 1-Month	2.46" (62.48mm)	2.52" (64.01mm)	-0.06" (-1.53mm)	56th Driest	Driest since: 2012	1987
	2.46" (62.48mm)	2.52" (64.01mm)	-0.06" (-1.53mm)	73rd Wettest	Wettest since: 2017	1957
	Ties: 1968
Mar–Apr 2018 2-Month	4.94" (125.48mm)	5.03" (127.76mm)	-0.09" (-2.28mm)	63rd Driest	Driest since: 2013	1910
Mar–Apr 2018 2-Month	4.94" (125.48mm)	5.03" (127.76mm)	-0.09" (-2.28mm)	66th Wettest	Wettest since: 2017	1973
Feb–Apr 2018 3-Month	7.83" (198.88mm)	7.16" (181.86mm)	0.67" (17.02mm)	101st Driest	Driest since: 2015	1910
	7.83" (198.88mm)	7.16" (181.86mm)	0.67" (17.02mm)	28th Wettest	Wettest since: 2017	1983
	Ties: 2020
Jan–Apr 2018 4-Month	9.68" (245.87mm)	9.48" (240.79mm)	0.20" (5.08mm)	79th Driest	Driest since: 2015	1910
Jan–Apr 2018 4-Month	9.68" (245.87mm)	9.48" (240.79mm)	0.20" (5.08mm)	50th Wettest	Wettest since: 2017	1998
Dec 2017–Apr 2018 5-Month	11.27" (286.26mm)	11.82" (300.23mm)	-0.55" (-13.97mm)	39th Driest	Driest since: 2015	1931
	11.27" (286.26mm)	11.82" (300.23mm)	-0.55" (-13.97mm)	89th Wettest	Wettest since: 2017	1983
	Ties: 2006
Nov 2017–Apr 2018 6-Month	12.89" (327.41mm)	14.05" (356.87mm)	-1.16" (-29.46mm)	22nd Driest	Driest since: 2000	1977
	12.89" (327.41mm)	14.05" (356.87mm)	-1.16" (-29.46mm)	106th Wettest	Wettest since: 2017	1983
	Ties: 1910
Oct 2017–Apr 2018 7-Month	15.49" (393.45mm)	16.22" (411.99mm)	-0.73" (-18.54mm)	39th Driest	Driest since: 2014	1981
	15.49" (393.45mm)	16.22" (411.99mm)	-0.73" (-18.54mm)	89th Wettest	Wettest since: 2017	1983
	Ties: 1951
Sep 2017–Apr 2018 8-Month	17.76" (451.10mm)	18.71" (475.23mm)	-0.95" (-24.13mm)	36th Driest	Driest since: 2002	1918
Sep 2017–Apr 2018 8-Month	17.76" (451.10mm)	18.71" (475.23mm)	-0.95" (-24.13mm)	92nd Wettest	Wettest since: 2017	2019
Aug 2017–Apr 2018 9-Month	21.18" (537.97mm)	21.33" (541.78mm)	-0.15" (-3.81mm)	56th Driest	Driest since: 2014	1918
Aug 2017–Apr 2018 9-Month	21.18" (537.97mm)	21.33" (541.78mm)	-0.15" (-3.81mm)	72nd Wettest	Wettest since: 2017	2019
Jul 2017–Apr 2018 10-Month	23.98" (609.09mm)	24.12" (612.65mm)	-0.14" (-3.56mm)	54th Driest	Driest since: 2013	1931
Jul 2017–Apr 2018 10-Month	23.98" (609.09mm)	24.12" (612.65mm)	-0.14" (-3.56mm)	74th Wettest	Wettest since: 2017	2019
Jun 2017–Apr 2018 11-Month	27.05" (687.07mm)	27.04" (686.82mm)	0.01" (0.25mm)	55th Driest	Driest since: 2013	1931
Jun 2017–Apr 2018 11-Month	27.05" (687.07mm)	27.04" (686.82mm)	0.01" (0.25mm)	73rd Wettest	Wettest since: 2017	2019
May 2017–Apr 2018 12-Month	30.41" (772.41mm)	29.95" (760.73mm)	0.46" (11.68mm)	69th Driest	Driest since: 2013	1918
	30.41" (772.41mm)	29.95" (760.73mm)	0.46" (11.68mm)	59th Wettest	Wettest since: 2017	2019
	Ties: 1909
Nov 2016–Apr 2018 18-Month	46.46" (1,180.08mm)	44.02" (1,118.11mm)	2.44" (61.97mm)	101st Driest	Driest since: 2015	1931
Nov 2016–Apr 2018 18-Month	46.46" (1,180.08mm)	44.02" (1,118.11mm)	2.44" (61.97mm)	26th Wettest	Wettest since: 2017	2020
May 2016–Apr 2018 24-Month	63.52" (1,613.41mm)	59.92" (1,521.97mm)	3.60" (91.44mm)	106th Driest	Driest since: 2015	1955
May 2016–Apr 2018 24-Month	63.52" (1,613.41mm)	59.92" (1,521.97mm)	3.60" (91.44mm)	21st Wettest	Wettest since: 2017	2020
May 2015–Apr 2018 36-Month	99.47" (2,526.54mm)	89.88" (2,282.95mm)	9.59" (243.59mm)	118th Driest	Driest since: 2016	1955
May 2015–Apr 2018 36-Month	99.47" (2,526.54mm)	89.88" (2,282.95mm)	9.59" (243.59mm)	8th Wettest	Wettest since: 2017	2020
May 2014–Apr 2018 48-Month	129.98" (3,301.49mm)	119.77" (3,042.16mm)	10.21" (259.33mm)	116th Driest	Driest since: 2016	1956
May 2014–Apr 2018 48-Month	129.98" (3,301.49mm)	119.77" (3,042.16mm)	10.21" (259.33mm)	9th Wettest	Wettest since: 2017	2019
May 2013–Apr 2018 60-Month	160.90" (4,086.86mm)	149.63" (3,800.60mm)	11.27" (286.26mm)	117th Driest	Driest since: 2017	1957
May 2013–Apr 2018 60-Month	160.90" (4,086.86mm)	149.63" (3,800.60mm)	11.27" (286.26mm)	7th Wettest	Wettest since: 1999	2020

Citing This Page

NOAA National Centers for Environmental information, Climate at a Glance: National Rankings, published March 2023, retrieved on March 23, 2023 from https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/national/rankings