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 2020

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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
October 2020 1-Month	2.18" (55.37mm)	2.16" (54.86mm)	0.02" (0.51mm)	61st Driest	Driest since: 2011	1952
	2.18" (55.37mm)	2.16" (54.86mm)	0.02" (0.51mm)	68th Wettest	Wettest since: 2019	2009
	Ties: 2008
Sep–Oct 2020 2-Month	4.62" (117.35mm)	4.65" (118.11mm)	-0.03" (-0.76mm)	53rd Driest	Driest since: 2012	1952
	4.62" (117.35mm)	4.65" (118.11mm)	-0.03" (-0.76mm)	76th Wettest	Wettest since: 2019	2018
	Ties: 1915, 2011
Aug–Oct 2020 3-Month	7.04" (178.82mm)	7.27" (184.66mm)	-0.23" (-5.84mm)	46th Driest	Driest since: 2012	1952
	7.04" (178.82mm)	7.27" (184.66mm)	-0.23" (-5.84mm)	83rd Wettest	Wettest since: 2019	2018
	Ties: 2012
Jul–Oct 2020 4-Month	9.98" (253.49mm)	10.05" (255.27mm)	-0.07" (-1.78mm)	52nd Driest	Driest since: 2012	1952
Jul–Oct 2020 4-Month	9.98" (253.49mm)	10.05" (255.27mm)	-0.07" (-1.78mm)	77th Wettest	Wettest since: 2019	1941
Jun–Oct 2020 5-Month	12.71" (322.83mm)	12.97" (329.44mm)	-0.26" (-6.61mm)	45th Driest	Driest since: 2012	1952
Jun–Oct 2020 5-Month	12.71" (322.83mm)	12.97" (329.44mm)	-0.26" (-6.61mm)	84th Wettest	Wettest since: 2019	1941
May–Oct 2020 6-Month	15.80" (401.32mm)	15.88" (403.35mm)	-0.08" (-2.03mm)	53rd Driest	Driest since: 2012	1952
May–Oct 2020 6-Month	15.80" (401.32mm)	15.88" (403.35mm)	-0.08" (-2.03mm)	76th Wettest	Wettest since: 2019	1941
Apr–Oct 2020 7-Month	18.32" (465.33mm)	18.40" (467.36mm)	-0.08" (-2.03mm)	54th Driest	Driest since: 2012	1952
Apr–Oct 2020 7-Month	18.32" (465.33mm)	18.40" (467.36mm)	-0.08" (-2.03mm)	75th Wettest	Wettest since: 2019	1941
Mar–Oct 2020 8-Month	21.18" (537.97mm)	20.91" (531.11mm)	0.27" (6.86mm)	65th Driest	Driest since: 2012	1956
Mar–Oct 2020 8-Month	21.18" (537.97mm)	20.91" (531.11mm)	0.27" (6.86mm)	64th Wettest	Wettest since: 2019	2019
Feb–Oct 2020 9-Month	23.63" (600.20mm)	23.04" (585.22mm)	0.59" (14.98mm)	76th Driest	Driest since: 2012	1934
Feb–Oct 2020 9-Month	23.63" (600.20mm)	23.04" (585.22mm)	0.59" (14.98mm)	53rd Wettest	Wettest since: 2019	2019
Jan–Oct 2020 10-Month	26.39" (670.31mm)	25.36" (644.14mm)	1.03" (26.17mm)	88th Driest	Driest since: 2014	1934
Jan–Oct 2020 10-Month	26.39" (670.31mm)	25.36" (644.14mm)	1.03" (26.17mm)	41st Wettest	Wettest since: 2019	2019
Dec 2019–Oct 2020 11-Month	28.96" (735.58mm)	27.70" (703.58mm)	1.26" (32.00mm)	88th Driest	Driest since: 2014	1931
	28.96" (735.58mm)	27.70" (703.58mm)	1.26" (32.00mm)	40th Wettest	Wettest since: 2019	2019
	Ties: 1900
Nov 2019–Oct 2020 12-Month	30.90" (784.86mm)	29.93" (760.22mm)	0.97" (24.64mm)	82nd Driest	Driest since: 2014	1934
	30.90" (784.86mm)	29.93" (760.22mm)	0.97" (24.64mm)	46th Wettest	Wettest since: 2019	2019
	Ties: 1920
May 2019–Oct 2020 18-Month	49.92" (1,267.97mm)	45.83" (1,164.08mm)	4.09" (103.89mm)	117th Driest	Driest since: 2018	1931
May 2019–Oct 2020 18-Month	49.92" (1,267.97mm)	45.83" (1,164.08mm)	4.09" (103.89mm)	11th Wettest	Wettest since: 2019	2019
Nov 2018–Oct 2020 24-Month	67.17" (1,706.12mm)	59.90" (1,521.46mm)	7.27" (184.66mm)	122nd Driest	Driest since: 2018	1931
Nov 2018–Oct 2020 24-Month	67.17" (1,706.12mm)	59.90" (1,521.46mm)	7.27" (184.66mm)	5th Wettest	Wettest since: 2019	2019
Nov 2017–Oct 2020 36-Month	99.07" (2,516.38mm)	89.86" (2,282.44mm)	9.21" (233.94mm)	119th Driest	Driest since: 2016	1956
Nov 2017–Oct 2020 36-Month	99.07" (2,516.38mm)	89.86" (2,282.44mm)	9.21" (233.94mm)	7th Wettest	Wettest since: 2019	2019
Nov 2016–Oct 2020 48-Month	132.64" (3,369.06mm)	119.78" (3,042.41mm)	12.86" (326.65mm)	123rd Driest	Driest since: 2018	1956
Nov 2016–Oct 2020 48-Month	132.64" (3,369.06mm)	119.78" (3,042.41mm)	12.86" (326.65mm)	2nd Wettest	Wettest since: 2019	2019
Nov 2015–Oct 2020 60-Month	167.00" (4,241.80mm)	149.66" (3,801.36mm)	17.34" (440.44mm)	122nd Driest	Driest since: 2018	1934
Nov 2015–Oct 2020 60-Month	167.00" (4,241.80mm)	149.66" (3,801.36mm)	17.34" (440.44mm)	2nd Wettest	Wettest since: 2019	2019

Citing This Page

NOAA National Centers for Environmental information, Climate at a Glance: National Rankings, published January 2023, retrieved on February 7, 2023 from https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/national/rankings