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 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
September 2018 1-Month	3.57" (90.68mm)	2.49" (63.25mm)	1.08" (27.43mm)	127th Driest	Driest since: 2017	1956
September 2018 1-Month	3.57" (90.68mm)	2.49" (63.25mm)	1.08" (27.43mm)	2nd Wettest	Wettest since: 1986	1986
Aug–Sep 2018 2-Month	6.55" (166.37mm)	5.11" (129.79mm)	1.44" (36.58mm)	127th Driest	Driest since: 2017	1956
Aug–Sep 2018 2-Month	6.55" (166.37mm)	5.11" (129.79mm)	1.44" (36.58mm)	2nd Wettest	Wettest since: 1977	1977
Jul–Sep 2018 3-Month	9.41" (239.01mm)	7.88" (200.15mm)	1.53" (38.86mm)	126th Driest	Driest since: 2017	1930
Jul–Sep 2018 3-Month	9.41" (239.01mm)	7.88" (200.15mm)	1.53" (38.86mm)	3rd Wettest	Wettest since: 1915	1915
Jun–Sep 2018 4-Month	12.56" (319.02mm)	10.81" (274.57mm)	1.75" (44.45mm)	123rd Driest	Driest since: 2017	1930
Jun–Sep 2018 4-Month	12.56" (319.02mm)	10.81" (274.57mm)	1.75" (44.45mm)	6th Wettest	Wettest since: 2004	1915
May–Sep 2018 5-Month	15.58" (395.73mm)	13.72" (348.49mm)	1.86" (47.24mm)	122nd Driest	Driest since: 2017	1956
May–Sep 2018 5-Month	15.58" (395.73mm)	13.72" (348.49mm)	1.86" (47.24mm)	7th Wettest	Wettest since: 2015	1915
Apr–Sep 2018 6-Month	18.04" (458.22mm)	16.24" (412.50mm)	1.80" (45.72mm)	117th Driest	Driest since: 2016	1956
Apr–Sep 2018 6-Month	18.04" (458.22mm)	16.24" (412.50mm)	1.80" (45.72mm)	12th Wettest	Wettest since: 2017	1915
Mar–Sep 2018 7-Month	20.52" (521.21mm)	18.75" (476.25mm)	1.77" (44.96mm)	112th Driest	Driest since: 2014	1956
Mar–Sep 2018 7-Month	20.52" (521.21mm)	18.75" (476.25mm)	1.77" (44.96mm)	17th Wettest	Wettest since: 2017	1973
Feb–Sep 2018 8-Month	23.41" (594.61mm)	20.88" (530.35mm)	2.53" (64.26mm)	121st Driest	Driest since: 2017	1930
Feb–Sep 2018 8-Month	23.41" (594.61mm)	20.88" (530.35mm)	2.53" (64.26mm)	8th Wettest	Wettest since: 1975	2019
Jan–Sep 2018 9-Month	25.26" (641.60mm)	23.20" (589.28mm)	2.06" (52.32mm)	115th Driest	Driest since: 2016	1934
Jan–Sep 2018 9-Month	25.26" (641.60mm)	23.20" (589.28mm)	2.06" (52.32mm)	14th Wettest	Wettest since: 2017	2019
Dec 2017–Sep 2018 10-Month	26.85" (681.99mm)	25.54" (648.72mm)	1.31" (33.27mm)	92nd Driest	Driest since: 2014	1931
	26.85" (681.99mm)	25.54" (648.72mm)	1.31" (33.27mm)	36th Wettest	Wettest since: 2017	2019
	Ties: 1907
Nov 2017–Sep 2018 11-Month	28.47" (723.14mm)	27.77" (705.36mm)	0.70" (17.78mm)	77th Driest	Driest since: 2014	1934
Nov 2017–Sep 2018 11-Month	28.47" (723.14mm)	27.77" (705.36mm)	0.70" (17.78mm)	51st Wettest	Wettest since: 2017	2019
Oct 2017–Sep 2018 12-Month	31.07" (789.18mm)	29.94" (760.48mm)	1.13" (28.70mm)	82nd Driest	Driest since: 2014	1934
Oct 2017–Sep 2018 12-Month	31.07" (789.18mm)	29.94" (760.48mm)	1.13" (28.70mm)	46th Wettest	Wettest since: 2017	2019
Apr 2017–Sep 2018 18-Month	49.49" (1,257.05mm)	46.20" (1,173.48mm)	3.29" (83.57mm)	110th Driest	Driest since: 2015	1931
Apr 2017–Sep 2018 18-Month	49.49" (1,257.05mm)	46.20" (1,173.48mm)	3.29" (83.57mm)	18th Wettest	Wettest since: 2017	2019
Oct 2016–Sep 2018 24-Month	64.43" (1,636.52mm)	59.92" (1,521.97mm)	4.51" (114.55mm)	112th Driest	Driest since: 2015	1918
Oct 2016–Sep 2018 24-Month	64.43" (1,636.52mm)	59.92" (1,521.97mm)	4.51" (114.55mm)	15th Wettest	Wettest since: 2017	2020
Oct 2015–Sep 2018 36-Month	99.30" (2,522.22mm)	89.87" (2,282.70mm)	9.43" (239.52mm)	121st Driest	Driest since: 2016	1956
Oct 2015–Sep 2018 36-Month	99.30" (2,522.22mm)	89.87" (2,282.70mm)	9.43" (239.52mm)	5th Wettest	Wettest since: 2017	2019
Oct 2014–Sep 2018 48-Month	130.71" (3,320.03mm)	119.78" (3,042.41mm)	10.93" (277.62mm)	120th Driest	Driest since: 2017	1956
Oct 2014–Sep 2018 48-Month	130.71" (3,320.03mm)	119.78" (3,042.41mm)	10.93" (277.62mm)	5th Wettest	Wettest since: 1998	2019
Oct 2013–Sep 2018 60-Month	160.91" (4,087.11mm)	149.66" (3,801.36mm)	11.25" (285.75mm)	115th Driest	Driest since: 2017	1956
Oct 2013–Sep 2018 60-Month	160.91" (4,087.11mm)	149.66" (3,801.36mm)	11.25" (285.75mm)	9th Wettest	Wettest since: 1999	2020

Citing This Page

NOAA National Centers for Environmental information, Climate at a Glance: National Rankings, published May 2023, retrieved on June 4, 2023 from https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/national/rankings