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 2015

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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 2015 1-Month	2.12" (53.85mm)	2.49" (63.25mm)	-0.37" (-9.40mm)	24th Driest	Driest since: 2005	1956
	2.12" (53.85mm)	2.49" (63.25mm)	-0.37" (-9.40mm)	105th Wettest	Wettest since: 2014	1986
	Ties: 1903
Aug–Sep 2015 2-Month	4.53" (115.06mm)	5.11" (129.79mm)	-0.58" (-14.73mm)	19th Driest	Driest since: 2000	1956
Aug–Sep 2015 2-Month	4.53" (115.06mm)	5.11" (129.79mm)	-0.58" (-14.73mm)	110th Wettest	Wettest since: 2014	1977
Jul–Sep 2015 3-Month	7.76" (197.10mm)	7.88" (200.15mm)	-0.12" (-3.05mm)	52nd Driest	Driest since: 2012	1930
	7.76" (197.10mm)	7.88" (200.15mm)	-0.12" (-3.05mm)	77th Wettest	Wettest since: 2014	1915
	Ties: 1987
Jun–Sep 2015 4-Month	11.31" (287.27mm)	10.81" (274.57mm)	0.50" (12.70mm)	87th Driest	Driest since: 2012	1930
	11.31" (287.27mm)	10.81" (274.57mm)	0.50" (12.70mm)	42nd Wettest	Wettest since: 2014	1915
	Ties: 2009
May–Sep 2015 5-Month	15.75" (400.05mm)	13.72" (348.49mm)	2.03" (51.56mm)	124th Driest	Driest since: 2014	1956
May–Sep 2015 5-Month	15.75" (400.05mm)	13.72" (348.49mm)	2.03" (51.56mm)	5th Wettest	Wettest since: 2004	1915
Apr–Sep 2015 6-Month	18.58" (471.93mm)	16.24" (412.50mm)	2.34" (59.43mm)	125th Driest	Driest since: 2014	1956
Apr–Sep 2015 6-Month	18.58" (471.93mm)	16.24" (412.50mm)	2.34" (59.43mm)	4th Wettest	Wettest since: 1957	1915
Mar–Sep 2015 7-Month	20.71" (526.03mm)	18.75" (476.25mm)	1.96" (49.78mm)	117th Driest	Driest since: 2014	1956
Mar–Sep 2015 7-Month	20.71" (526.03mm)	18.75" (476.25mm)	1.96" (49.78mm)	12th Wettest	Wettest since: 1993	1973
Feb–Sep 2015 8-Month	22.45" (570.23mm)	20.88" (530.35mm)	1.57" (39.88mm)	104th Driest	Driest since: 2014	1930
Feb–Sep 2015 8-Month	22.45" (570.23mm)	20.88" (530.35mm)	1.57" (39.88mm)	25th Wettest	Wettest since: 2004	2019
Jan–Sep 2015 9-Month	24.28" (616.71mm)	23.20" (589.28mm)	1.08" (27.43mm)	95th Driest	Driest since: 2014	1934
	24.28" (616.71mm)	23.20" (589.28mm)	1.08" (27.43mm)	34th Wettest	Wettest since: 2013	2019
	Ties: 1927
Dec 2014–Sep 2015 10-Month	26.86" (682.24mm)	25.54" (648.72mm)	1.32" (33.52mm)	93rd Driest	Driest since: 2014	1931
Dec 2014–Sep 2015 10-Month	26.86" (682.24mm)	25.54" (648.72mm)	1.32" (33.52mm)	35th Wettest	Wettest since: 2013	2019
Nov 2014–Sep 2015 11-Month	28.99" (736.35mm)	27.77" (705.36mm)	1.22" (30.99mm)	92nd Driest	Driest since: 2014	1934
Nov 2014–Sep 2015 11-Month	28.99" (736.35mm)	27.77" (705.36mm)	1.22" (30.99mm)	36th Wettest	Wettest since: 2010	2019
Oct 2014–Sep 2015 12-Month	31.41" (797.81mm)	29.94" (760.48mm)	1.47" (37.33mm)	90th Driest	Driest since: 2014	1934
	31.41" (797.81mm)	29.94" (760.48mm)	1.47" (37.33mm)	38th Wettest	Wettest since: 2010	2019
	Ties: 1999
Apr 2014–Sep 2015 18-Month	49.14" (1,248.16mm)	46.20" (1,173.48mm)	2.94" (74.68mm)	104th Driest	Driest since: 2014	1931
	49.14" (1,248.16mm)	46.20" (1,173.48mm)	2.94" (74.68mm)	24th Wettest	Wettest since: 2010	2019
	Ties: 1945
Oct 2013–Sep 2015 24-Month	61.61" (1,564.89mm)	59.92" (1,521.97mm)	1.69" (42.92mm)	80th Driest	Driest since: 2014	1918
Oct 2013–Sep 2015 24-Month	61.61" (1,564.89mm)	59.92" (1,521.97mm)	1.69" (42.92mm)	47th Wettest	Wettest since: 2011	2020
Oct 2012–Sep 2015 36-Month	92.62" (2,352.55mm)	89.87" (2,282.70mm)	2.75" (69.85mm)	91st Driest	Driest since: 2014	1956
	92.62" (2,352.55mm)	89.87" (2,282.70mm)	2.75" (69.85mm)	35th Wettest	Wettest since: 2011	2019
	Ties: 1959
Oct 2011–Sep 2015 48-Month	120.59" (3,062.99mm)	119.78" (3,042.41mm)	0.81" (20.58mm)	65th Driest	Driest since: 2014	1956
Oct 2011–Sep 2015 48-Month	120.59" (3,062.99mm)	119.78" (3,042.41mm)	0.81" (20.58mm)	60th Wettest	Wettest since: 2013	2019
Oct 2010–Sep 2015 60-Month	150.46" (3,821.68mm)	149.66" (3,801.36mm)	0.80" (20.32mm)	64th Driest	Driest since: 2004	1956
Oct 2010–Sep 2015 60-Month	150.46" (3,821.68mm)	149.66" (3,801.36mm)	0.80" (20.32mm)	60th Wettest	Wettest since: 2014	2020

Citing This Page

NOAA National Centers for Environmental information, Climate at a Glance: National Rankings, published May 2023, retrieved on June 2, 2023 from https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/national/rankings