Regional Rankings

Regional Data Info
Please note, Palmer Indices are not available for NWS Regions. Palmer Drought Severity Index (PDSI), Palmer Hydrological Drought Index (PHDI), and Palmer Modified Drought Index (PMDI) are not offered for multiple-month time scales.

Northwest Climate Region

Precipitation Rankings, October 1939

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  • Record Wettest
Period Value 1901-2000
Mean		 Anomaly Rank
(1895-2022)		 Wettest/Driest
Since		 Record
October 1939
1-Month 		2.28"
(57.91mm)		 2.54"
(64.52mm)		 -0.26"
(-6.61mm)		 56th Driest
Driest since:
 1895
73rd Wettest
Wettest since:
 2016
Sep–Oct 1939
2-Month 		3.19"
(81.03mm)		 3.96"
(100.58mm)		 -0.77"
(-19.55mm)		 40th Driest
Driest since:
 1987
89th Wettest
Wettest since:
 2016
Aug–Oct 1939
3-Month 		3.56"
(90.42mm)		 4.76"
(120.90mm)		 -1.20"
(-30.48mm)		 30th Driest
Driest since:
 1987
99th Wettest
Wettest since:
 2016
Jul–Oct 1939
4-Month 		4.30"
(109.22mm)		 5.49"
(139.45mm)		 -1.19"
(-30.23mm)		 27th Driest
Driest since:
 1952
102nd Wettest
Wettest since:
 2016
Ties: 2003
Jun–Oct 1939
5-Month 		5.69"
(144.53mm)		 7.21"
(183.13mm)		 -1.52"
(-38.60mm)		 27th Driest
Driest since:
 1917, 2002
102nd Wettest
Wettest since:
 1947
May–Oct 1939
6-Month 		7.01"
(178.05mm)		 9.35"
(237.49mm)		 -2.34"
(-59.44mm)		 16th Driest
Driest since:
 2002
113th Wettest
Wettest since:
 1941
Apr–Oct 1939
7-Month 		7.80"
(198.12mm)		 11.71"
(297.43mm)		 -3.91"
(-99.31mm)		 4th Driest
Driest since:
 2002
125th Wettest
Wettest since:
 1997
Mar–Oct 1939
8-Month 		10.22"
(259.59mm)		 14.97"
(380.24mm)		 -4.75"
(-120.65mm)		 1st Driest
Driest since:
 1939
128th Wettest
Wettest since:
 1997
Feb–Oct 1939
9-Month 		14.03"
(356.36mm)		 18.58"
(471.93mm)		 -4.55"
(-115.57mm)		 7th Driest
Driest since:
 1929
122nd Wettest
Wettest since:
 2017
Jan–Oct 1939
10-Month 		17.77"
(451.36mm)		 23.10"
(586.74mm)		 -5.33"
(-135.38mm)		 5th Driest
Driest since:
 1929
124th Wettest
Wettest since:
 1950
Dec 1938–Oct 1939
11-Month 		20.96"
(532.38mm)		 27.75"
(704.85mm)		 -6.79"
(-172.47mm)		 6th Driest
Driest since:
 1929
122nd Wettest
Wettest since:
 1997
Nov 1938–Oct 1939
12-Month 		24.43"
(620.52mm)		 32.10"
(815.34mm)		 -7.67"
(-194.82mm)		 7th Driest
Driest since:
 1977
121st Wettest
Wettest since:
 1997
May 1938–Oct 1939
18-Month 		32.32"
(820.93mm)		 41.48"
(1,053.59mm)		 -9.16"
(-232.66mm)		 6th Driest
Driest since:
 1929
122nd Wettest
Wettest since:
 1997
Nov 1937–Oct 1939
24-Month 		60.91"
(1,547.11mm)		 64.23"
(1,631.44mm)		 -3.32"
(-84.33mm)		 39th Driest
Driest since:
 1930
88th Wettest
Wettest since:
 1997
Nov 1936–Oct 1939
36-Month 		90.11"
(2,288.79mm)		 96.31"
(2,446.27mm)		 -6.20"
(-157.48mm)		 29th Driest
Driest since:
 1931
97th Wettest
Wettest since:
 1997
Nov 1935–Oct 1939
48-Month 		118.40"
(3,007.36mm)		 128.38"
(3,260.85mm)		 -9.98"
(-253.49mm)		 18th Driest
Driest since:
 1931
107th Wettest
Wettest since:
 1999
Nov 1934–Oct 1939
60-Month 		147.14"
(3,737.36mm)		 160.37"
(4,073.40mm)		 -13.23"
(-336.04mm)		 15th Driest
Driest since:
 1932
109th Wettest
Wettest since:
 1999

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