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 1978

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 1978
1-Month
3.01"
(76.45mm)
4.63"
(117.60mm)
-1.62"
(-41.15mm)
22nd Driest
Driest since:
1976
106th Wettest
Wettest since:
1964
Ties: 1988
Nov–Dec 1978
2-Month
5.99"
(152.15mm)
8.97"
(227.84mm)
-2.98"
(-75.69mm)
18th Driest
Driest since:
1976
110th Wettest
Wettest since:
1996
Oct–Dec 1978
3-Month
6.37"
(161.80mm)
11.51"
(292.35mm)
-5.14"
(-130.55mm)
4th Driest
Driest since:
1976
124th Wettest
Wettest since:
1996
Sep–Dec 1978
4-Month
9.06"
(230.12mm)
12.93"
(328.42mm)
-3.87"
(-98.30mm)
11th Driest
Driest since:
1976
117th Wettest
Wettest since:
1996
Aug–Dec 1978
5-Month
10.78"
(273.81mm)
13.73"
(348.74mm)
-2.95"
(-74.93mm)
20th Driest
Driest since:
1936
108th Wettest
Wettest since:
1996
Jul–Dec 1978
6-Month
11.92"
(302.77mm)
14.46"
(367.28mm)
-2.54"
(-64.51mm)
26th Driest
Driest since:
1936
102nd Wettest
Wettest since:
1996
Jun–Dec 1978
7-Month
13.08"
(332.23mm)
16.18"
(410.97mm)
-3.10"
(-78.74mm)
25th Driest
Driest since:
1976
103rd Wettest
Wettest since:
1996
May–Dec 1978
8-Month
15.35"
(389.89mm)
18.32"
(465.33mm)
-2.97"
(-75.44mm)
26th Driest
Driest since:
1935
102nd Wettest
Wettest since:
1996
Apr–Dec 1978
9-Month
19.28"
(489.71mm)
20.67"
(525.02mm)
-1.39"
(-35.31mm)
48th Driest
Driest since:
1976
80th Wettest
Wettest since:
1996
Mar–Dec 1978
10-Month
21.47"
(545.34mm)
23.93"
(607.82mm)
-2.46"
(-62.48mm)
38th Driest
Driest since:
1976
90th Wettest
Wettest since:
1996
Feb–Dec 1978
11-Month
24.73"
(628.14mm)
27.54"
(699.52mm)
-2.81"
(-71.38mm)
36th Driest
Driest since:
1935
92nd Wettest
Wettest since:
1996
Jan–Dec 1978
12-Month
28.97"
(735.84mm)
32.07"
(814.58mm)
-3.10"
(-78.74mm)
33rd Driest
Driest since:
1929
95th Wettest
Wettest since:
1996
Jul 1977–Dec 1978
18-Month
48.78"
(1,239.01mm)
46.58"
(1,183.13mm)
2.20"
(55.88mm)
89th Driest
Driest since:
1929
38th Wettest
Wettest since:
1996
Jan 1977–Dec 1978
24-Month
60.72"
(1,542.29mm)
64.19"
(1,630.43mm)
-3.47"
(-88.14mm)
36th Driest
Driest since:
1930
91st Wettest
Wettest since:
1996
Jan 1976–Dec 1978
36-Month
85.46"
(2,170.68mm)
96.33"
(2,446.78mm)
-10.87"
(-276.10mm)
9th Driest
Driest since:
1930
117th Wettest
Wettest since:
1997
Jan 1975–Dec 1978
48-Month
123.37"
(3,133.60mm)
128.33"
(3,259.58mm)
-4.96"
(-125.98mm)
36th Driest
Driest since:
1931
89th Wettest
Wettest since:
1998
Jan 1974–Dec 1978
60-Month
156.37"
(3,971.80mm)
160.34"
(4,072.64mm)
-3.97"
(-100.84mm)
45th Driest
Driest since:
1932
79th Wettest
Wettest since:
1999

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