Regional Rankings

Regional Data Info
Please note, Palmer Indices are not available for NWS Regions. Degree Days are not available for Great Plains, Souther Plains and Gulf Coast Rockies and Westward, River Basins, or Agricultural Belts. 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 1977

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Period Value 1901-2000
Mean		 Anomaly Rank
(1895-2022)		 Wettest/Driest
Since		 Record
October 1977
1-Month 		1.71"
(43.43mm)		 2.54"
(64.52mm)		 -0.83"
(-21.09mm)		 32nd Driest
Driest since:
 1895
97th Wettest
Wettest since:
 2016
Sep–Oct 1977
2-Month 		4.32"
(109.73mm)		 3.96"
(100.58mm)		 0.36"
(9.15mm)		 80th Driest
Driest since:
 1987
49th Wettest
Wettest since:
 2016
Ties: 1909
Aug–Oct 1977
3-Month 		6.19"
(157.23mm)		 4.76"
(120.90mm)		 1.43"
(36.33mm)		 106th Driest
Driest since:
 1987
23rd Wettest
Wettest since:
 2016
Ties: 1979, 2021
Jul–Oct 1977
4-Month 		7.00"
(177.80mm)		 5.49"
(139.45mm)		 1.51"
(38.35mm)		 106th Driest
Driest since:
 1952
23rd Wettest
Wettest since:
 2016
Jun–Oct 1977
5-Month 		8.18"
(207.77mm)		 7.21"
(183.13mm)		 0.97"
(24.64mm)		 98th Driest
Driest since:
 1917, 2002
31st Wettest
Wettest since:
 1947
May–Oct 1977
6-Month 		11.64"
(295.66mm)		 9.35"
(237.49mm)		 2.29"
(58.17mm)		 112th Driest
Driest since:
 2002
17th Wettest
Wettest since:
 1941
Apr–Oct 1977
7-Month 		12.36"
(313.94mm)		 11.71"
(297.43mm)		 0.65"
(16.51mm)		 81st Driest
Driest since:
 2002
48th Wettest
Wettest since:
 1997
Mar–Oct 1977
8-Month 		15.66"
(397.76mm)		 14.97"
(380.24mm)		 0.69"
(17.52mm)		 72nd Driest
Driest since:
 1939
57th Wettest
Wettest since:
 1997
Ties: 1938
Feb–Oct 1977
9-Month 		17.52"
(445.01mm)		 18.58"
(471.93mm)		 -1.06"
(-26.92mm)		 50th Driest
Driest since:
 1929
79th Wettest
Wettest since:
 2017
Jan–Oct 1977
10-Month 		18.94"
(481.08mm)		 23.10"
(586.74mm)		 -4.16"
(-105.66mm)		 16th Driest
Driest since:
 1929
113th Wettest
Wettest since:
 1950
Dec 1976–Oct 1977
11-Month 		20.25"
(514.35mm)		 27.75"
(704.85mm)		 -7.50"
(-190.50mm)		 4th Driest
Driest since:
 1929
124th Wettest
Wettest since:
 1997
Nov 1976–Oct 1977
12-Month 		21.26"
(540.00mm)		 32.10"
(815.34mm)		 -10.84"
(-275.34mm)		 1st Driest
Driest to Date
 1977
127th Wettest
Wettest since:
 1997
May 1976–Oct 1977
18-Month 		29.66"
(753.36mm)		 41.48"
(1,053.59mm)		 -11.82"
(-300.23mm)		 2nd Driest
Driest since:
 1929
126th Wettest
Wettest since:
 1997
Nov 1975–Oct 1977
24-Month 		53.58"
(1,360.93mm)		 64.23"
(1,631.44mm)		 -10.65"
(-270.51mm)		 8th Driest
Driest since:
 1930
119th Wettest
Wettest since:
 1997
Nov 1974–Oct 1977
36-Month 		90.64"
(2,302.26mm)		 96.31"
(2,446.27mm)		 -5.67"
(-144.01mm)		 31st Driest
Driest since:
 1931
95th Wettest
Wettest since:
 1997
Nov 1973–Oct 1977
48-Month 		130.37"
(3,311.40mm)		 128.38"
(3,260.85mm)		 1.99"
(50.55mm)		 80th Driest
Driest since:
 1931
45th Wettest
Wettest since:
 1999
Nov 1972–Oct 1977
60-Month 		156.42"
(3,973.07mm)		 160.37"
(4,073.40mm)		 -3.95"
(-100.33mm)		 48th Driest
Driest since:
 1932
76th Wettest
Wettest since:
 1999

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