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 1917

View Period (Months):
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  • Record Wettest
Period Value 1901-2000
Mean		 Anomaly Rank
(1895-2022)		 Wettest/Driest
Since		 Record
October 1917
1-Month 		0.34"
(8.64mm)		 2.54"
(64.52mm)		 -2.20"
(-55.88mm)		 3rd Driest
Driest since:
 1895
126th Wettest
Wettest since:
 2016
Sep–Oct 1917
2-Month 		2.04"
(51.82mm)		 3.96"
(100.58mm)		 -1.92"
(-48.76mm)		 9th Driest
Driest since:
 1987
120th Wettest
Wettest since:
 2016
Aug–Oct 1917
3-Month 		2.18"
(55.37mm)		 4.76"
(120.90mm)		 -2.58"
(-65.53mm)		 7th Driest
Driest since:
 1987
122nd Wettest
Wettest since:
 2016
Jul–Oct 1917
4-Month 		2.38"
(60.45mm)		 5.49"
(139.45mm)		 -3.11"
(-79.00mm)		 4th Driest
Driest since:
 1952
125th Wettest
Wettest since:
 2016
Jun–Oct 1917
5-Month 		3.50"
(88.90mm)		 7.21"
(183.13mm)		 -3.71"
(-94.23mm)		 1st Driest
Driest since:
 1917, 2002
128th Wettest
Wettest since:
 1947
Ties: 2002
May–Oct 1917
6-Month 		5.87"
(149.10mm)		 9.35"
(237.49mm)		 -3.48"
(-88.39mm)		 6th Driest
Driest since:
 2002
123rd Wettest
Wettest since:
 1941
Apr–Oct 1917
7-Month 		9.61"
(244.09mm)		 11.71"
(297.43mm)		 -2.10"
(-53.34mm)		 22nd Driest
Driest since:
 2002
107th Wettest
Wettest since:
 1997
Mar–Oct 1917
8-Month 		13.29"
(337.57mm)		 14.97"
(380.24mm)		 -1.68"
(-42.67mm)		 37th Driest
Driest since:
 1939
92nd Wettest
Wettest since:
 1997
Feb–Oct 1917
9-Month 		16.74"
(425.20mm)		 18.58"
(471.93mm)		 -1.84"
(-46.73mm)		 37th Driest
Driest since:
 1929
92nd Wettest
Wettest since:
 2017
Jan–Oct 1917
10-Month 		19.87"
(504.70mm)		 23.10"
(586.74mm)		 -3.23"
(-82.04mm)		 30th Driest
Driest since:
 1929
99th Wettest
Wettest since:
 1950
Dec 1916–Oct 1917
11-Month 		23.94"
(608.08mm)		 27.75"
(704.85mm)		 -3.81"
(-96.77mm)		 24th Driest
Driest since:
 1929
104th Wettest
Wettest since:
 1997
Nov 1916–Oct 1917
12-Month 		27.54"
(699.52mm)		 32.10"
(815.34mm)		 -4.56"
(-115.82mm)		 18th Driest
Driest since:
 1977
110th Wettest
Wettest since:
 1997
May 1916–Oct 1917
18-Month 		36.31"
(922.27mm)		 41.48"
(1,053.59mm)		 -5.17"
(-131.32mm)		 20th Driest
Driest since:
 1929
108th Wettest
Wettest since:
 1997
Nov 1915–Oct 1917
24-Month 		65.54"
(1,664.72mm)		 64.23"
(1,631.44mm)		 1.31"
(33.28mm)		 80th Driest
Driest since:
 1930
47th Wettest
Wettest since:
 1997
Nov 1914–Oct 1917
36-Month 		90.87"
(2,308.10mm)		 96.31"
(2,446.27mm)		 -5.44"
(-138.17mm)		 34th Driest
Driest since:
 1931
92nd Wettest
Wettest since:
 1997
Nov 1913–Oct 1917
48-Month 		123.60"
(3,139.44mm)		 128.38"
(3,260.85mm)		 -4.78"
(-121.41mm)		 39th Driest
Driest since:
 1931
86th Wettest
Wettest since:
 1999
Nov 1912–Oct 1917
60-Month 		155.49"
(3,949.45mm)		 160.37"
(4,073.40mm)		 -4.88"
(-123.95mm)		 42nd Driest
Driest since:
 1932
82nd Wettest
Wettest since:
 1999

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