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 1999

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 1999
1-Month
2.16"
(54.86mm)
2.54"
(64.52mm)
-0.38"
(-9.66mm)
48th Driest
Driest since:
1895
81st Wettest
Wettest since:
2016
Sep–Oct 1999
2-Month
2.35"
(59.69mm)
3.96"
(100.58mm)
-1.61"
(-40.89mm)
17th Driest
Driest since:
1987
112th Wettest
Wettest since:
2016
Aug–Oct 1999
3-Month
3.50"
(88.90mm)
4.76"
(120.90mm)
-1.26"
(-32.00mm)
26th Driest
Driest since:
1987
103rd Wettest
Wettest since:
2016
Ties: 2011
Jul–Oct 1999
4-Month
3.93"
(99.82mm)
5.49"
(139.45mm)
-1.56"
(-39.63mm)
19th Driest
Driest since:
1952
110th Wettest
Wettest since:
2016
Ties: 2020
Jun–Oct 1999
5-Month
5.39"
(136.91mm)
7.21"
(183.13mm)
-1.82"
(-46.22mm)
20th Driest
Driest since:
1917, 2002
109th Wettest
Wettest since:
1947
May–Oct 1999
6-Month
7.60"
(193.04mm)
9.35"
(237.49mm)
-1.75"
(-44.45mm)
24th Driest
Driest since:
2002
105th Wettest
Wettest since:
1941
Apr–Oct 1999
7-Month
9.09"
(230.89mm)
11.71"
(297.43mm)
-2.62"
(-66.54mm)
15th Driest
Driest since:
2002
114th Wettest
Wettest since:
1997
Mar–Oct 1999
8-Month
12.10"
(307.34mm)
14.97"
(380.24mm)
-2.87"
(-72.90mm)
20th Driest
Driest since:
1939
109th Wettest
Wettest since:
1997
Feb–Oct 1999
9-Month
19.26"
(489.20mm)
18.58"
(471.93mm)
0.68"
(17.27mm)
77th Driest
Driest since:
1929
52nd Wettest
Wettest since:
2017
Ties: 1951
Jan–Oct 1999
10-Month
24.51"
(622.55mm)
23.10"
(586.74mm)
1.41"
(35.81mm)
87th Driest
Driest since:
1929
42nd Wettest
Wettest since:
1950
Dec 1998–Oct 1999
11-Month
30.70"
(779.78mm)
27.75"
(704.85mm)
2.95"
(74.93mm)
103rd Driest
Driest since:
1929
25th Wettest
Wettest since:
1997
Nov 1998–Oct 1999
12-Month
38.02"
(965.71mm)
32.10"
(815.34mm)
5.92"
(150.37mm)
116th Driest
Driest since:
1977
12th Wettest
Wettest since:
1997
May 1998–Oct 1999
18-Month
48.87"
(1,241.30mm)
41.48"
(1,053.59mm)
7.39"
(187.71mm)
119th Driest
Driest since:
1929
9th Wettest
Wettest since:
1997
Nov 1997–Oct 1999
24-Month
69.93"
(1,776.22mm)
64.23"
(1,631.44mm)
5.70"
(144.78mm)
110th Driest
Driest since:
1930
17th Wettest
Wettest since:
1997
Nov 1996–Oct 1999
36-Month
115.48"
(2,933.19mm)
96.31"
(2,446.27mm)
19.17"
(486.92mm)
122nd Driest
Driest since:
1931
4th Wettest
Wettest since:
1997
Nov 1995–Oct 1999
48-Month
157.24"
(3,993.90mm)
128.38"
(3,260.85mm)
28.86"
(733.05mm)
124th Driest
Driest since:
1931
1st Wettest
Wettest to Date
1999
Nov 1994–Oct 1999
60-Month
194.98"
(4,952.49mm)
160.37"
(4,073.40mm)
34.61"
(879.09mm)
123rd Driest
Driest since:
1932
1st Wettest
Wettest to Date
1999

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