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 1956

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 1956
1-Month
4.18"
(106.17mm)
4.63"
(117.60mm)
-0.45"
(-11.43mm)
55th Driest
Driest since:
1976
73rd Wettest
Wettest since:
1964
Nov–Dec 1956
2-Month
5.55"
(140.97mm)
8.97"
(227.84mm)
-3.42"
(-86.87mm)
12th Driest
Driest since:
1976
116th Wettest
Wettest since:
1996
Oct–Dec 1956
3-Month
10.59"
(268.99mm)
11.51"
(292.35mm)
-0.92"
(-23.36mm)
49th Driest
Driest since:
1976
79th Wettest
Wettest since:
1996
Ties: 1904
Sep–Dec 1956
4-Month
11.57"
(293.88mm)
12.93"
(328.42mm)
-1.36"
(-34.54mm)
43rd Driest
Driest since:
1976
85th Wettest
Wettest since:
1996
Ties: 2020
Aug–Dec 1956
5-Month
12.55"
(318.77mm)
13.73"
(348.74mm)
-1.18"
(-29.97mm)
49th Driest
Driest since:
1936
79th Wettest
Wettest since:
1996
Jul–Dec 1956
6-Month
13.21"
(335.53mm)
14.46"
(367.28mm)
-1.25"
(-31.75mm)
48th Driest
Driest since:
1936
80th Wettest
Wettest since:
1996
Jun–Dec 1956
7-Month
15.13"
(384.30mm)
16.18"
(410.97mm)
-1.05"
(-26.67mm)
54th Driest
Driest since:
1976
74th Wettest
Wettest since:
1996
May–Dec 1956
8-Month
17.65"
(448.31mm)
18.32"
(465.33mm)
-0.67"
(-17.02mm)
62nd Driest
Driest since:
1935
66th Wettest
Wettest since:
1996
Apr–Dec 1956
9-Month
18.65"
(473.71mm)
20.67"
(525.02mm)
-2.02"
(-51.31mm)
40th Driest
Driest since:
1976
88th Wettest
Wettest since:
1996
Mar–Dec 1956
10-Month
22.12"
(561.85mm)
23.93"
(607.82mm)
-1.81"
(-45.97mm)
44th Driest
Driest since:
1976
84th Wettest
Wettest since:
1996
Feb–Dec 1956
11-Month
25.75"
(654.05mm)
27.54"
(699.52mm)
-1.79"
(-45.47mm)
51st Driest
Driest since:
1935
77th Wettest
Wettest since:
1996
Jan–Dec 1956
12-Month
32.67"
(829.82mm)
32.07"
(814.58mm)
0.60"
(15.24mm)
74th Driest
Driest since:
1929
54th Wettest
Wettest since:
1996
Jul 1955–Dec 1956
18-Month
54.15"
(1,375.41mm)
46.58"
(1,183.13mm)
7.57"
(192.28mm)
114th Driest
Driest since:
1929
13th Wettest
Wettest since:
1996
Jan 1955–Dec 1956
24-Month
69.23"
(1,758.44mm)
64.19"
(1,630.43mm)
5.04"
(128.01mm)
106th Driest
Driest since:
1930
21st Wettest
Wettest since:
1996
Jan 1954–Dec 1956
36-Month
100.42"
(2,550.67mm)
96.33"
(2,446.78mm)
4.09"
(103.89mm)
96th Driest
Driest since:
1930
30th Wettest
Wettest since:
1997
Jan 1953–Dec 1956
48-Month
138.37"
(3,514.60mm)
128.33"
(3,259.58mm)
10.04"
(255.02mm)
109th Driest
Driest since:
1931
16th Wettest
Wettest since:
1998
Jan 1952–Dec 1956
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: 2015

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