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, August 2009

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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
August 2009 1-Month	2.69" (68.33mm)	2.62" (66.55mm)	0.07" (1.78mm)	75th Driest	Driest since: 2007	1929
	2.69" (68.33mm)	2.62" (66.55mm)	0.07" (1.78mm)	54th Wettest	Wettest since: 2008	1977
	Ties: 1904
Jul–Aug 2009 2-Month	5.76" (146.30mm)	5.40" (137.16mm)	0.36" (9.14mm)	98th Driest	Driest since: 2007	1930
Jul–Aug 2009 2-Month	5.76" (146.30mm)	5.40" (137.16mm)	0.36" (9.14mm)	31st Wettest	Wettest since: 2008	1915
Jun–Aug 2009 3-Month	8.77" (222.76mm)	8.32" (211.33mm)	0.45" (11.43mm)	91st Driest	Driest since: 2007	1930
	8.77" (222.76mm)	8.32" (211.33mm)	0.45" (11.43mm)	38th Wettest	Wettest since: 2008	1928
	Ties: 1949, 1965, 1968
May–Aug 2009 4-Month	12.08" (306.83mm)	11.23" (285.24mm)	0.85" (21.59mm)	101st Driest	Driest since: 2008	1936
May–Aug 2009 4-Month	12.08" (306.83mm)	11.23" (285.24mm)	0.85" (21.59mm)	28th Wettest	Wettest since: 2004	1915
Apr–Aug 2009 5-Month	14.91" (378.71mm)	13.75" (349.25mm)	1.16" (29.46mm)	102nd Driest	Driest since: 2008	1934
Apr–Aug 2009 5-Month	14.91" (378.71mm)	13.75" (349.25mm)	1.16" (29.46mm)	27th Wettest	Wettest since: 2004	2019
Mar–Aug 2009 6-Month	17.61" (447.29mm)	16.26" (413.00mm)	1.35" (34.29mm)	106th Driest	Driest since: 2008	1936
	17.61" (447.29mm)	16.26" (413.00mm)	1.35" (34.29mm)	23rd Wettest	Wettest since: 1995	1905
	Ties: 1944
Feb–Aug 2009 7-Month	19.16" (486.66mm)	18.40" (467.36mm)	0.76" (19.30mm)	81st Driest	Driest since: 2007	1934
Feb–Aug 2009 7-Month	19.16" (486.66mm)	18.40" (467.36mm)	0.76" (19.30mm)	48th Wettest	Wettest since: 2008	2019
Jan–Aug 2009 8-Month	20.76" (527.30mm)	20.71" (526.03mm)	0.05" (1.27mm)	60th Driest	Driest since: 2007	1934
	20.76" (527.30mm)	20.71" (526.03mm)	0.05" (1.27mm)	69th Wettest	Wettest since: 2008	2019
	Ties: 1898
Dec 2008–Aug 2009 9-Month	23.60" (599.44mm)	23.05" (585.47mm)	0.55" (13.97mm)	75th Driest	Driest since: 2007	1931
Dec 2008–Aug 2009 9-Month	23.60" (599.44mm)	23.05" (585.47mm)	0.55" (13.97mm)	53rd Wettest	Wettest since: 2008	2019
Nov 2008–Aug 2009 10-Month	25.55" (648.97mm)	25.28" (642.11mm)	0.27" (6.86mm)	67th Driest	Driest since: 2007	1934
Nov 2008–Aug 2009 10-Month	25.55" (648.97mm)	25.28" (642.11mm)	0.27" (6.86mm)	61st Wettest	Wettest since: 2008	2019
Oct 2008–Aug 2009 11-Month	27.73" (704.34mm)	27.45" (697.23mm)	0.28" (7.11mm)	67th Driest	Driest since: 2006	1934
	27.73" (704.34mm)	27.45" (697.23mm)	0.28" (7.11mm)	61st Wettest	Wettest since: 2008	2019
	Ties: 1965
Sep 2008–Aug 2009 12-Month	30.41" (772.41mm)	29.94" (760.48mm)	0.47" (11.93mm)	67th Driest	Driest since: 2006	1934
Sep 2008–Aug 2009 12-Month	30.41" (772.41mm)	29.94" (760.48mm)	0.47" (11.93mm)	61st Wettest	Wettest since: 2008	2019
Mar 2008–Aug 2009 18-Month	47.32" (1,201.93mm)	46.22" (1,173.99mm)	1.10" (27.94mm)	80th Driest	Driest since: 2008	1931
Mar 2008–Aug 2009 18-Month	47.32" (1,201.93mm)	46.22" (1,173.99mm)	1.10" (27.94mm)	48th Wettest	Wettest since: 2005	2019
Sep 2007–Aug 2009 24-Month	61.26" (1,556.00mm)	59.92" (1,521.97mm)	1.34" (34.03mm)	77th Driest	Driest since: 2007	1918
Sep 2007–Aug 2009 24-Month	61.26" (1,556.00mm)	59.92" (1,521.97mm)	1.34" (34.03mm)	50th Wettest	Wettest since: 2008	2020
Sep 2006–Aug 2009 36-Month	91.91" (2,334.51mm)	89.86" (2,282.44mm)	2.05" (52.07mm)	81st Driest	Driest since: 2008	1956
Sep 2006–Aug 2009 36-Month	91.91" (2,334.51mm)	89.86" (2,282.44mm)	2.05" (52.07mm)	45th Wettest	Wettest since: 2006	2019
Sep 2005–Aug 2009 48-Month	119.82" (3,043.43mm)	119.77" (3,042.16mm)	0.05" (1.27mm)	59th Driest	Driest since: 2004	1956
Sep 2005–Aug 2009 48-Month	119.82" (3,043.43mm)	119.77" (3,042.16mm)	0.05" (1.27mm)	66th Wettest	Wettest since: 2008	2019
Sep 2004–Aug 2009 60-Month	152.46" (3,872.48mm)	149.64" (3,800.86mm)	2.82" (71.62mm)	78th Driest	Driest since: 2006	1934
Sep 2004–Aug 2009 60-Month	152.46" (3,872.48mm)	149.64" (3,800.86mm)	2.82" (71.62mm)	46th Wettest	Wettest since: 2008	2019

Citing This Page

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