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, December 2015

View Period (Months):
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  • Record Driest
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  • Record Wettest
Period Value 1901-2000
Mean
Anomaly Rank
(1895-2021)
Wettest/Driest
Since
Record
December 2015
1-Month
8.60"
(218.44mm)
4.63"
(117.60mm)
3.97"
(100.84mm)
124th Driest
Driest since:
1976
4th Wettest
Wettest since:
1964
Nov–Dec 2015
2-Month
12.86"
(326.64mm)
8.97"
(227.84mm)
3.89"
(98.80mm)
115th Driest
Driest since:
1976
13th Wettest
Wettest since:
1996
Oct–Dec 2015
3-Month
15.32"
(389.13mm)
11.51"
(292.35mm)
3.81"
(96.78mm)
117th Driest
Driest since:
1976
11th Wettest
Wettest since:
1996
Sep–Dec 2015
4-Month
16.49"
(418.85mm)
12.93"
(328.42mm)
3.56"
(90.43mm)
111th Driest
Driest since:
1976
17th Wettest
Wettest since:
1996
Aug–Dec 2015
5-Month
17.26"
(438.40mm)
13.73"
(348.74mm)
3.53"
(89.66mm)
113th Driest
Driest since:
1936
15th Wettest
Wettest since:
1996
Jul–Dec 2015
6-Month
18.13"
(460.50mm)
14.46"
(367.28mm)
3.67"
(93.22mm)
113th Driest
Driest since:
1936
15th Wettest
Wettest since:
1996
Jun–Dec 2015
7-Month
18.68"
(474.47mm)
16.18"
(410.97mm)
2.50"
(63.50mm)
99th Driest
Driest since:
1976
29th Wettest
Wettest since:
1996
May–Dec 2015
8-Month
20.91"
(531.11mm)
18.32"
(465.33mm)
2.59"
(65.78mm)
97th Driest
Driest since:
1935
31st Wettest
Wettest since:
1996
Apr–Dec 2015
9-Month
22.42"
(569.47mm)
20.67"
(525.02mm)
1.75"
(44.45mm)
89th Driest
Driest since:
1976
39th Wettest
Wettest since:
1996
Mar–Dec 2015
10-Month
25.12"
(638.05mm)
23.93"
(607.82mm)
1.19"
(30.23mm)
80th Driest
Driest since:
1976
48th Wettest
Wettest since:
1996
Ties: 1947
Feb–Dec 2015
11-Month
28.32"
(719.33mm)
27.54"
(699.52mm)
0.78"
(19.81mm)
71st Driest
Driest since:
1935
57th Wettest
Wettest since:
1996
Jan–Dec 2015
12-Month
31.14"
(790.96mm)
32.07"
(814.58mm)
-0.93"
(-23.62mm)
59th Driest
Driest since:
1929
69th Wettest
Wettest since:
1996
Jul 2014–Dec 2015
18-Month
47.63"
(1,209.80mm)
46.58"
(1,183.13mm)
1.05"
(26.67mm)
74th Driest
Driest since:
1929
53rd Wettest
Wettest since:
1996
Jan 2014–Dec 2015
24-Month
67.12"
(1,704.85mm)
64.19"
(1,630.43mm)
2.93"
(74.42mm)
87th Driest
Driest since:
1930
40th Wettest
Wettest since:
1996
Jan 2013–Dec 2015
36-Month
91.63"
(2,327.40mm)
96.33"
(2,446.78mm)
-4.70"
(-119.38mm)
34th Driest
Driest since:
1930
92nd Wettest
Wettest since:
1997
Jan 2012–Dec 2015
48-Month
130.33"
(3,310.38mm)
128.33"
(3,259.58mm)
2.00"
(50.80mm)
83rd Driest
Driest since:
1931
42nd Wettest
Wettest since:
1998
Jan 2011–Dec 2015
60-Month
162.56"
(4,129.02mm)
160.34"
(4,072.64mm)
2.22"
(56.38mm)
74th Driest
Driest since:
1932
50th Wettest
Wettest since:
1999
Ties: 1956

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