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, July 1990

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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
July 1990 1-Month	2.94" (74.68mm)	2.78" (70.61mm)	0.16" (4.07mm)	87th Driest	Driest since: 1989	1930
	2.94" (74.68mm)	2.78" (70.61mm)	0.16" (4.07mm)	42nd Wettest	Wettest since: 1982	1950, 1958
	Ties: 1959, 2020
Jun–Jul 1990 2-Month	5.44" (138.18mm)	5.70" (144.78mm)	-0.26" (-6.60mm)	39th Driest	Driest since: 1988	1930
Jun–Jul 1990 2-Month	5.44" (138.18mm)	5.70" (144.78mm)	-0.26" (-6.60mm)	90th Wettest	Wettest since: 1989	1928
May–Jul 1990 3-Month	9.27" (235.46mm)	8.62" (218.95mm)	0.65" (16.51mm)	96th Driest	Driest since: 1988	1988
May–Jul 1990 3-Month	9.27" (235.46mm)	8.62" (218.95mm)	0.65" (16.51mm)	33rd Wettest	Wettest since: 1989	2015
Apr–Jul 1990 4-Month	11.76" (298.70mm)	11.13" (282.70mm)	0.63" (16.00mm)	88th Driest	Driest since: 1989	1934
Apr–Jul 1990 4-Month	11.76" (298.70mm)	11.13" (282.70mm)	0.63" (16.00mm)	41st Wettest	Wettest since: 1984	2015
Mar–Jul 1990 5-Month	14.47" (367.54mm)	13.64" (346.46mm)	0.83" (21.08mm)	95th Driest	Driest since: 1988	1936
	14.47" (367.54mm)	13.64" (346.46mm)	0.83" (21.08mm)	34th Wettest	Wettest since: 1989	1973
	Ties: 1915, 2003
Feb–Jul 1990 6-Month	17.15" (435.61mm)	15.78" (400.81mm)	1.37" (34.80mm)	106th Driest	Driest since: 1989	1934
	17.15" (435.61mm)	15.78" (400.81mm)	1.37" (34.80mm)	23rd Wettest	Wettest since: 1983	2019
	Ties: 1961
Jan–Jul 1990 7-Month	19.94" (506.48mm)	18.09" (459.49mm)	1.85" (46.99mm)	112th Driest	Driest since: 1989	1934
Jan–Jul 1990 7-Month	19.94" (506.48mm)	18.09" (459.49mm)	1.85" (46.99mm)	17th Wettest	Wettest since: 1983	2019
Dec 1989–Jul 1990 8-Month	21.28" (540.51mm)	20.44" (519.18mm)	0.84" (21.33mm)	84th Driest	Driest since: 1989	1931
Dec 1989–Jul 1990 8-Month	21.28" (540.51mm)	20.44" (519.18mm)	0.84" (21.33mm)	44th Wettest	Wettest since: 1984	2019
Nov 1989–Jul 1990 9-Month	23.01" (584.45mm)	22.66" (575.56mm)	0.35" (8.89mm)	68th Driest	Driest since: 1988	1934
Nov 1989–Jul 1990 9-Month	23.01" (584.45mm)	22.66" (575.56mm)	0.35" (8.89mm)	60th Wettest	Wettest since: 1989	2019
Oct 1989–Jul 1990 10-Month	24.90" (632.46mm)	24.83" (630.68mm)	0.07" (1.78mm)	58th Driest	Driest since: 1988	1934
	24.90" (632.46mm)	24.83" (630.68mm)	0.07" (1.78mm)	70th Wettest	Wettest since: 1989	2019
	Ties: 1952
Sep 1989–Jul 1990 11-Month	27.58" (700.53mm)	27.33" (694.18mm)	0.25" (6.35mm)	62nd Driest	Driest since: 1988	1934
Sep 1989–Jul 1990 11-Month	27.58" (700.53mm)	27.33" (694.18mm)	0.25" (6.35mm)	66th Wettest	Wettest since: 1989	2019
Aug 1989–Jul 1990 12-Month	30.31" (769.87mm)	29.95" (760.73mm)	0.36" (9.14mm)	62nd Driest	Driest since: 1988	1918
Aug 1989–Jul 1990 12-Month	30.31" (769.87mm)	29.95" (760.73mm)	0.36" (9.14mm)	66th Wettest	Wettest since: 1989	2019
Feb 1989–Jul 1990 18-Month	46.94" (1,192.28mm)	45.74" (1,161.80mm)	1.20" (30.48mm)	75th Driest	Driest since: 1989	1931
Feb 1989–Jul 1990 18-Month	46.94" (1,192.28mm)	45.74" (1,161.80mm)	1.20" (30.48mm)	53rd Wettest	Wettest since: 1987	2019
Aug 1988–Jul 1990 24-Month	60.66" (1,540.76mm)	59.92" (1,521.97mm)	0.74" (18.79mm)	68th Driest	Driest since: 1989	1918
Aug 1988–Jul 1990 24-Month	60.66" (1,540.76mm)	59.92" (1,521.97mm)	0.74" (18.79mm)	59th Wettest	Wettest since: 1987	2020
Aug 1987–Jul 1990 36-Month	86.39" (2,194.31mm)	89.88" (2,282.95mm)	-3.49" (-88.64mm)	23rd Driest	Driest since: 1966	1956
Aug 1987–Jul 1990 36-Month	86.39" (2,194.31mm)	89.88" (2,282.95mm)	-3.49" (-88.64mm)	103rd Wettest	Wettest since: 1989	2019
Aug 1986–Jul 1990 48-Month	118.06" (2,998.72mm)	119.78" (3,042.41mm)	-1.72" (-43.69mm)	42nd Driest	Driest since: 1988	1956
Aug 1986–Jul 1990 48-Month	118.06" (2,998.72mm)	119.78" (3,042.41mm)	-1.72" (-43.69mm)	83rd Wettest	Wettest since: 1989	2019
Aug 1985–Jul 1990 60-Month	149.39" (3,794.51mm)	149.64" (3,800.86mm)	-0.25" (-6.35mm)	60th Driest	Driest since: 1989	1934
Aug 1985–Jul 1990 60-Month	149.39" (3,794.51mm)	149.64" (3,800.86mm)	-0.25" (-6.35mm)	64th Wettest	Wettest since: 1988	2019

Citing This Page

NOAA National Centers for Environmental information, Climate at a Glance: National Rankings, published March 2023, retrieved on March 28, 2023 from https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/national/rankings