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 1987

View Period (Months):
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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 1987
1-Month
0.17"
(4.32mm)
2.54"
(64.52mm)
-2.37"
(-60.20mm)
2nd Driest
Driest since:
1895
127th Wettest
Wettest since:
2016
Sep–Oct 1987
2-Month
0.41"
(10.41mm)
3.96"
(100.58mm)
-3.55"
(-90.17mm)
1st Driest
Driest since:
1987
128th Wettest
Wettest since:
2016
Aug–Oct 1987
3-Month
0.85"
(21.59mm)
4.76"
(120.90mm)
-3.91"
(-99.31mm)
1st Driest
Driest since:
1987
128th Wettest
Wettest since:
2016
Jul–Oct 1987
4-Month
2.63"
(66.80mm)
5.49"
(139.45mm)
-2.86"
(-72.65mm)
5th Driest
Driest since:
1952
124th Wettest
Wettest since:
2016
Jun–Oct 1987
5-Month
3.73"
(94.74mm)
7.21"
(183.13mm)
-3.48"
(-88.39mm)
3rd Driest
Driest since:
1917, 2002
126th Wettest
Wettest since:
1947
May–Oct 1987
6-Month
6.15"
(156.21mm)
9.35"
(237.49mm)
-3.20"
(-81.28mm)
8th Driest
Driest since:
2002
121st Wettest
Wettest since:
1941
Apr–Oct 1987
7-Month
7.68"
(195.07mm)
11.71"
(297.43mm)
-4.03"
(-102.36mm)
3rd Driest
Driest since:
2002
126th Wettest
Wettest since:
1997
Mar–Oct 1987
8-Month
11.38"
(289.05mm)
14.97"
(380.24mm)
-3.59"
(-91.19mm)
9th Driest
Driest since:
1939
120th Wettest
Wettest since:
1997
Feb–Oct 1987
9-Month
14.06"
(357.12mm)
18.58"
(471.93mm)
-4.52"
(-114.81mm)
8th Driest
Driest since:
1929
121st Wettest
Wettest since:
2017
Ties: 1924, 1966
Jan–Oct 1987
10-Month
18.03"
(457.96mm)
23.10"
(586.74mm)
-5.07"
(-128.78mm)
7th Driest
Driest since:
1929
122nd Wettest
Wettest since:
1950
Dec 1986–Oct 1987
11-Month
20.08"
(510.03mm)
27.75"
(704.85mm)
-7.67"
(-194.82mm)
3rd Driest
Driest since:
1929
125th Wettest
Wettest since:
1997
Nov 1986–Oct 1987
12-Month
24.93"
(633.22mm)
32.10"
(815.34mm)
-7.17"
(-182.12mm)
9th Driest
Driest since:
1977
119th Wettest
Wettest since:
1997
May 1986–Oct 1987
18-Month
34.09"
(865.89mm)
41.48"
(1,053.59mm)
-7.39"
(-187.70mm)
10th Driest
Driest since:
1929
118th Wettest
Wettest since:
1997
Nov 1985–Oct 1987
24-Month
56.28"
(1,429.51mm)
64.23"
(1,631.44mm)
-7.95"
(-201.93mm)
12th Driest
Driest since:
1930
115th Wettest
Wettest since:
1997
Nov 1984–Oct 1987
36-Month
85.42"
(2,169.67mm)
96.31"
(2,446.27mm)
-10.89"
(-276.60mm)
11th Driest
Driest since:
1931
115th Wettest
Wettest since:
1997
Nov 1983–Oct 1987
48-Month
124.80"
(3,169.92mm)
128.38"
(3,260.85mm)
-3.58"
(-90.93mm)
44th Driest
Driest since:
1931
81st Wettest
Wettest since:
1999
Ties: 1928
Nov 1982–Oct 1987
60-Month
163.33"
(4,148.58mm)
160.37"
(4,073.40mm)
2.96"
(75.18mm)
76th Driest
Driest since:
1932
48th Wettest
Wettest since:
1999

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