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 1940

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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 1940 1-Month	2.00" (50.80mm)	2.49" (63.25mm)	-0.49" (-12.45mm)	17th Driest	Driest since: 1939	1956
	2.00" (50.80mm)	2.49" (63.25mm)	-0.49" (-12.45mm)	112th Wettest	Wettest since: 1938	1986
	Ties: 1937
Aug–Sep 1940 2-Month	4.97" (126.24mm)	5.11" (129.79mm)	-0.14" (-3.55mm)	52nd Driest	Driest since: 1939	1956
Aug–Sep 1940 2-Month	4.97" (126.24mm)	5.11" (129.79mm)	-0.14" (-3.55mm)	77th Wettest	Wettest since: 1936	1977
Jul–Sep 1940 3-Month	7.47" (189.74mm)	7.88" (200.15mm)	-0.41" (-10.41mm)	30th Driest	Driest since: 1939	1930
Jul–Sep 1940 3-Month	7.47" (189.74mm)	7.88" (200.15mm)	-0.41" (-10.41mm)	99th Wettest	Wettest since: 1938	1915
Jun–Sep 1940 4-Month	10.45" (265.43mm)	10.81" (274.57mm)	-0.36" (-9.14mm)	40th Driest	Driest since: 1939	1930
Jun–Sep 1940 4-Month	10.45" (265.43mm)	10.81" (274.57mm)	-0.36" (-9.14mm)	89th Wettest	Wettest since: 1938	1915
May–Sep 1940 5-Month	12.67" (321.82mm)	13.72" (348.49mm)	-1.05" (-26.67mm)	23rd Driest	Driest since: 1939	1956
May–Sep 1940 5-Month	12.67" (321.82mm)	13.72" (348.49mm)	-1.05" (-26.67mm)	106th Wettest	Wettest since: 1938	1915
Apr–Sep 1940 6-Month	15.71" (399.03mm)	16.24" (412.50mm)	-0.53" (-13.47mm)	40th Driest	Driest since: 1939	1956
Apr–Sep 1940 6-Month	15.71" (399.03mm)	16.24" (412.50mm)	-0.53" (-13.47mm)	89th Wettest	Wettest since: 1938	1915
Mar–Sep 1940 7-Month	17.98" (456.69mm)	18.75" (476.25mm)	-0.77" (-19.56mm)	38th Driest	Driest since: 1939	1956
Mar–Sep 1940 7-Month	17.98" (456.69mm)	18.75" (476.25mm)	-0.77" (-19.56mm)	91st Wettest	Wettest since: 1938	1973
Feb–Sep 1940 8-Month	20.96" (532.38mm)	20.88" (530.35mm)	0.08" (2.03mm)	63rd Driest	Driest since: 1939	1930
Feb–Sep 1940 8-Month	20.96" (532.38mm)	20.88" (530.35mm)	0.08" (2.03mm)	66th Wettest	Wettest since: 1938	2019
Jan–Sep 1940 9-Month	22.89" (581.41mm)	23.20" (589.28mm)	-0.31" (-7.87mm)	51st Driest	Driest since: 1939	1934
Jan–Sep 1940 9-Month	22.89" (581.41mm)	23.20" (589.28mm)	-0.31" (-7.87mm)	78th Wettest	Wettest since: 1938	2019
Dec 1939–Sep 1940 10-Month	24.77" (629.16mm)	25.54" (648.72mm)	-0.77" (-19.56mm)	44th Driest	Driest since: 1939	1931
Dec 1939–Sep 1940 10-Month	24.77" (629.16mm)	25.54" (648.72mm)	-0.77" (-19.56mm)	84th Wettest	Wettest since: 1938	2019
Nov 1939–Sep 1940 11-Month	25.76" (654.30mm)	27.77" (705.36mm)	-2.01" (-51.06mm)	21st Driest	Driest since: 1939	1934
Nov 1939–Sep 1940 11-Month	25.76" (654.30mm)	27.77" (705.36mm)	-2.01" (-51.06mm)	107th Wettest	Wettest since: 1938	2019
Oct 1939–Sep 1940 12-Month	27.36" (694.94mm)	29.94" (760.48mm)	-2.58" (-65.54mm)	16th Driest	Driest since: 1939	1934
Oct 1939–Sep 1940 12-Month	27.36" (694.94mm)	29.94" (760.48mm)	-2.58" (-65.54mm)	112th Wettest	Wettest since: 1938	2019
Apr 1939–Sep 1940 18-Month	41.73" (1,059.94mm)	46.20" (1,173.48mm)	-4.47" (-113.54mm)	10th Driest	Driest since: 1934	1931
Apr 1939–Sep 1940 18-Month	41.73" (1,059.94mm)	46.20" (1,173.48mm)	-4.47" (-113.54mm)	118th Wettest	Wettest since: 1939	2019
Oct 1938–Sep 1940 24-Month	54.24" (1,377.70mm)	59.92" (1,521.97mm)	-5.68" (-144.27mm)	9th Driest	Driest since: 1934	1918
Oct 1938–Sep 1940 24-Month	54.24" (1,377.70mm)	59.92" (1,521.97mm)	-5.68" (-144.27mm)	118th Wettest	Wettest since: 1939	2020
Oct 1937–Sep 1940 36-Month	86.16" (2,188.46mm)	89.87" (2,282.70mm)	-3.71" (-94.24mm)	22nd Driest	Driest since: 1936	1956
Oct 1937–Sep 1940 36-Month	86.16" (2,188.46mm)	89.87" (2,282.70mm)	-3.71" (-94.24mm)	104th Wettest	Wettest since: 1939	2019
Oct 1936–Sep 1940 48-Month	115.48" (2,933.19mm)	119.78" (3,042.41mm)	-4.30" (-109.22mm)	23rd Driest	Driest since: 1939	1956
Oct 1936–Sep 1940 48-Month	115.48" (2,933.19mm)	119.78" (3,042.41mm)	-4.30" (-109.22mm)	102nd Wettest	Wettest since: 1938	2019
Oct 1935–Sep 1940 60-Month	142.18" (3,611.37mm)	149.66" (3,801.36mm)	-7.48" (-189.99mm)	9th Driest	Driest since: 1937	1956
Oct 1935–Sep 1940 60-Month	142.18" (3,611.37mm)	149.66" (3,801.36mm)	-7.48" (-189.99mm)	115th Wettest	Wettest since: 1939	2020

Citing This Page

NOAA National Centers for Environmental information, Climate at a Glance: National Rankings, published March 2023, retrieved on March 22, 2023 from https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/national/rankings