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, October 1940

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Record Wettest
Period	Value	1901-2000 Mean	Anomaly	Rank (1895-2022)	Wettest/Driest Since	Record
October 1940 1-Month	1.77" (44.96mm)	2.16" (54.86mm)	-0.39" (-9.90mm)	29th Driest	Driest since: 1939	1952
	1.77" (44.96mm)	2.16" (54.86mm)	-0.39" (-9.90mm)	100th Wettest	Wettest since: 1937	2009
	Ties: 1903
Sep–Oct 1940 2-Month	3.77" (95.76mm)	4.65" (118.11mm)	-0.88" (-22.35mm)	16th Driest	Driest since: 1939	1952
Sep–Oct 1940 2-Month	3.77" (95.76mm)	4.65" (118.11mm)	-0.88" (-22.35mm)	113th Wettest	Wettest since: 1937	2018
Aug–Oct 1940 3-Month	6.74" (171.20mm)	7.27" (184.66mm)	-0.53" (-13.46mm)	29th Driest	Driest since: 1939	1952
	6.74" (171.20mm)	7.27" (184.66mm)	-0.53" (-13.46mm)	100th Wettest	Wettest since: 1937	2018
	Ties: 1908
Jul–Oct 1940 4-Month	9.24" (234.70mm)	10.05" (255.27mm)	-0.81" (-20.57mm)	27th Driest	Driest since: 1939	1952
Jul–Oct 1940 4-Month	9.24" (234.70mm)	10.05" (255.27mm)	-0.81" (-20.57mm)	102nd Wettest	Wettest since: 1937	1941
Jun–Oct 1940 5-Month	12.22" (310.39mm)	12.97" (329.44mm)	-0.75" (-19.05mm)	33rd Driest	Driest since: 1939	1952
Jun–Oct 1940 5-Month	12.22" (310.39mm)	12.97" (329.44mm)	-0.75" (-19.05mm)	96th Wettest	Wettest since: 1938	1941
May–Oct 1940 6-Month	14.44" (366.78mm)	15.88" (403.35mm)	-1.44" (-36.57mm)	20th Driest	Driest since: 1939	1952
	14.44" (366.78mm)	15.88" (403.35mm)	-1.44" (-36.57mm)	109th Wettest	Wettest since: 1938	1941
	Ties: 1964
Apr–Oct 1940 7-Month	17.48" (443.99mm)	18.40" (467.36mm)	-0.92" (-23.37mm)	30th Driest	Driest since: 1939	1952
Apr–Oct 1940 7-Month	17.48" (443.99mm)	18.40" (467.36mm)	-0.92" (-23.37mm)	99th Wettest	Wettest since: 1938	1941
Mar–Oct 1940 8-Month	19.75" (501.65mm)	20.91" (531.11mm)	-1.16" (-29.46mm)	27th Driest	Driest since: 1939	1956
Mar–Oct 1940 8-Month	19.75" (501.65mm)	20.91" (531.11mm)	-1.16" (-29.46mm)	102nd Wettest	Wettest since: 1938	2019
Feb–Oct 1940 9-Month	22.73" (577.34mm)	23.04" (585.22mm)	-0.31" (-7.88mm)	48th Driest	Driest since: 1939	1934
	22.73" (577.34mm)	23.04" (585.22mm)	-0.31" (-7.88mm)	81st Wettest	Wettest since: 1938	2019
	Ties: 1948
Jan–Oct 1940 10-Month	24.66" (626.36mm)	25.36" (644.14mm)	-0.70" (-17.78mm)	35th Driest	Driest since: 1939	1934
Jan–Oct 1940 10-Month	24.66" (626.36mm)	25.36" (644.14mm)	-0.70" (-17.78mm)	94th Wettest	Wettest since: 1938	2019
Dec 1939–Oct 1940 11-Month	26.54" (674.12mm)	27.70" (703.58mm)	-1.16" (-29.46mm)	34th Driest	Driest since: 1939	1931
Dec 1939–Oct 1940 11-Month	26.54" (674.12mm)	27.70" (703.58mm)	-1.16" (-29.46mm)	94th Wettest	Wettest since: 1938	2019
Nov 1939–Oct 1940 12-Month	27.53" (699.26mm)	29.93" (760.22mm)	-2.40" (-60.96mm)	21st Driest	Driest since: 1939	1934
Nov 1939–Oct 1940 12-Month	27.53" (699.26mm)	29.93" (760.22mm)	-2.40" (-60.96mm)	107th Wettest	Wettest since: 1938	2019
May 1939–Oct 1940 18-Month	41.34" (1,050.04mm)	45.83" (1,164.08mm)	-4.49" (-114.04mm)	8th Driest	Driest since: 1934	1931
May 1939–Oct 1940 18-Month	41.34" (1,050.04mm)	45.83" (1,164.08mm)	-4.49" (-114.04mm)	120th Wettest	Wettest since: 1939	2019
Nov 1938–Oct 1940 24-Month	54.71" (1,389.63mm)	59.90" (1,521.46mm)	-5.19" (-131.83mm)	8th Driest	Driest since: 1934	1931
Nov 1938–Oct 1940 24-Month	54.71" (1,389.63mm)	59.90" (1,521.46mm)	-5.19" (-131.83mm)	119th Wettest	Wettest since: 1939	2019
Nov 1937–Oct 1940 36-Month	85.32" (2,167.13mm)	89.86" (2,282.44mm)	-4.54" (-115.31mm)	18th Driest	Driest since: 1936	1956
Nov 1937–Oct 1940 36-Month	85.32" (2,167.13mm)	89.86" (2,282.44mm)	-4.54" (-115.31mm)	108th Wettest	Wettest since: 1939	2019
Nov 1936–Oct 1940 48-Month	115.17" (2,925.32mm)	119.78" (3,042.41mm)	-4.61" (-117.09mm)	17th Driest	Driest since: 1939	1956
Nov 1936–Oct 1940 48-Month	115.17" (2,925.32mm)	119.78" (3,042.41mm)	-4.61" (-117.09mm)	108th Wettest	Wettest since: 1938	2019
Nov 1935–Oct 1940 60-Month	142.33" (3,615.18mm)	149.66" (3,801.36mm)	-7.33" (-186.18mm)	9th Driest	Driest since: 1937	1934
Nov 1935–Oct 1940 60-Month	142.33" (3,615.18mm)	149.66" (3,801.36mm)	-7.33" (-186.18mm)	115th Wettest	Wettest since: 1939	2019

Citing This Page

NOAA National Centers for Environmental information, Climate at a Glance: National Rankings, published January 2023, retrieved on February 5, 2023 from https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/national/rankings