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, September 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
September 2009 1-Month	2.54" (64.52mm)	2.49" (63.25mm)	0.05" (1.27mm)	75th Driest	Driest since: 2007	1956
	2.54" (64.52mm)	2.49" (63.25mm)	0.05" (1.27mm)	54th Wettest	Wettest since: 2008	1986
	Ties: 1964, 1997
Aug–Sep 2009 2-Month	5.23" (132.84mm)	5.11" (129.79mm)	0.12" (3.05mm)	79th Driest	Driest since: 2007	1956
	5.23" (132.84mm)	5.11" (129.79mm)	0.12" (3.05mm)	50th Wettest	Wettest since: 2008	1977
	Ties: 1992, 2019
Jul–Sep 2009 3-Month	8.30" (210.82mm)	7.88" (200.15mm)	0.42" (10.67mm)	90th Driest	Driest since: 2007	1930
Jul–Sep 2009 3-Month	8.30" (210.82mm)	7.88" (200.15mm)	0.42" (10.67mm)	39th Wettest	Wettest since: 2008	1915
Jun–Sep 2009 4-Month	11.31" (287.27mm)	10.81" (274.57mm)	0.50" (12.70mm)	87th Driest	Driest since: 2007	1930
	11.31" (287.27mm)	10.81" (274.57mm)	0.50" (12.70mm)	42nd Wettest	Wettest since: 2008	1915
	Ties: 2015
May–Sep 2009 5-Month	14.62" (371.35mm)	13.72" (348.49mm)	0.90" (22.86mm)	95th Driest	Driest since: 2008	1956
May–Sep 2009 5-Month	14.62" (371.35mm)	13.72" (348.49mm)	0.90" (22.86mm)	34th Wettest	Wettest since: 2004	1915
Apr–Sep 2009 6-Month	17.45" (443.23mm)	16.24" (412.50mm)	1.21" (30.73mm)	98th Driest	Driest since: 2008	1956
Apr–Sep 2009 6-Month	17.45" (443.23mm)	16.24" (412.50mm)	1.21" (30.73mm)	31st Wettest	Wettest since: 2004	1915
Mar–Sep 2009 7-Month	20.15" (511.81mm)	18.75" (476.25mm)	1.40" (35.56mm)	102nd Driest	Driest since: 2008	1956
Mar–Sep 2009 7-Month	20.15" (511.81mm)	18.75" (476.25mm)	1.40" (35.56mm)	27th Wettest	Wettest since: 2004	1973
Feb–Sep 2009 8-Month	21.70" (551.18mm)	20.88" (530.35mm)	0.82" (20.83mm)	82nd Driest	Driest since: 2007	1930
Feb–Sep 2009 8-Month	21.70" (551.18mm)	20.88" (530.35mm)	0.82" (20.83mm)	47th Wettest	Wettest since: 2008	2019
Jan–Sep 2009 9-Month	23.30" (591.82mm)	23.20" (589.28mm)	0.10" (2.54mm)	64th Driest	Driest since: 2007	1934
Jan–Sep 2009 9-Month	23.30" (591.82mm)	23.20" (589.28mm)	0.10" (2.54mm)	65th Wettest	Wettest since: 2008	2019
Dec 2008–Sep 2009 10-Month	26.14" (663.96mm)	25.54" (648.72mm)	0.60" (15.24mm)	78th Driest	Driest since: 2007	1931
Dec 2008–Sep 2009 10-Month	26.14" (663.96mm)	25.54" (648.72mm)	0.60" (15.24mm)	50th Wettest	Wettest since: 2008	2019
Nov 2008–Sep 2009 11-Month	28.09" (713.49mm)	27.77" (705.36mm)	0.32" (8.13mm)	68th Driest	Driest since: 2007	1934
Nov 2008–Sep 2009 11-Month	28.09" (713.49mm)	27.77" (705.36mm)	0.32" (8.13mm)	60th Wettest	Wettest since: 2008	2019
Oct 2008–Sep 2009 12-Month	30.27" (768.86mm)	29.94" (760.48mm)	0.33" (8.38mm)	68th Driest	Driest since: 2007	1934
Oct 2008–Sep 2009 12-Month	30.27" (768.86mm)	29.94" (760.48mm)	0.33" (8.38mm)	60th Wettest	Wettest since: 2008	2019
Apr 2008–Sep 2009 18-Month	47.34" (1,202.44mm)	46.20" (1,173.48mm)	1.14" (28.96mm)	79th Driest	Driest since: 2008	1931
Apr 2008–Sep 2009 18-Month	47.34" (1,202.44mm)	46.20" (1,173.48mm)	1.14" (28.96mm)	49th Wettest	Wettest since: 2005	2019
Oct 2007–Sep 2009 24-Month	61.63" (1,565.40mm)	59.92" (1,521.97mm)	1.71" (43.43mm)	81st Driest	Driest since: 2008	1918
Oct 2007–Sep 2009 24-Month	61.63" (1,565.40mm)	59.92" (1,521.97mm)	1.71" (43.43mm)	46th Wettest	Wettest since: 2005	2020
Oct 2006–Sep 2009 36-Month	91.65" (2,327.91mm)	89.87" (2,282.70mm)	1.78" (45.21mm)	80th Driest	Driest since: 2008	1956
Oct 2006–Sep 2009 36-Month	91.65" (2,327.91mm)	89.87" (2,282.70mm)	1.78" (45.21mm)	46th Wettest	Wettest since: 2006	2019
Oct 2005–Sep 2009 48-Month	120.42" (3,058.67mm)	119.78" (3,042.41mm)	0.64" (16.26mm)	64th Driest	Driest since: 2004	1956
Oct 2005–Sep 2009 48-Month	120.42" (3,058.67mm)	119.78" (3,042.41mm)	0.64" (16.26mm)	61st Wettest	Wettest since: 2008	2019
Oct 2004–Sep 2009 60-Month	152.02" (3,861.31mm)	149.66" (3,801.36mm)	2.36" (59.95mm)	75th Driest	Driest since: 2006	1956
Oct 2004–Sep 2009 60-Month	152.02" (3,861.31mm)	149.66" (3,801.36mm)	2.36" (59.95mm)	49th Wettest	Wettest since: 2008	2020

Citing This Page

NOAA National Centers for Environmental information, Climate at a Glance: National Rankings, published March 2023, retrieved on March 25, 2023 from https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/national/rankings