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.

Pacific Northwest Basin

Average Temperature Rankings, December 1931

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  • Record Warmest
Period Value 1901-2000
Mean
Anomaly Rank
(1895-2021)
Warmest/Coolest
Since
Record
December 1931
1-Month
25.0°F
(-3.9°C)
28.1°F
(-2.2°C)
-3.1°F
(-1.7°C)
22nd Coolest
Coolest since:
1990
106th Warmest
Warmest since:
1917
Ties: 1928
Nov–Dec 1931
2-Month
27.7°F
(-2.4°C)
31.3°F
(-0.4°C)
-3.6°F
(-2.0°C)
8th Coolest
Coolest since:
1985
120th Warmest
Warmest since:
1917
Oct–Dec 1931
3-Month
33.7°F
(0.9°C)
36.2°F
(2.3°C)
-2.5°F
(-1.4°C)
12th Coolest
Coolest since:
1985
116th Warmest
Warmest since:
1917
Sep–Dec 1931
4-Month
39.0°F
(3.9°C)
41.1°F
(5.1°C)
-2.1°F
(-1.2°C)
14th Coolest
Coolest since:
1985
114th Warmest
Warmest since:
1917
Aug–Dec 1931
5-Month
44.1°F
(6.7°C)
45.5°F
(7.5°C)
-1.4°F
(-0.8°C)
14th Coolest
Coolest since:
1985
114th Warmest
Warmest since:
1917, 2014
Ties: 1905, 1914, 1930
Jul–Dec 1931
6-Month
47.8°F
(8.8°C)
48.6°F
(9.2°C)
-0.8°F
(-0.4°C)
29th Coolest
Coolest since:
1985
99th Warmest
Warmest since:
2014
Ties: 1927, 1935, 1970
Jun–Dec 1931
7-Month
49.2°F
(9.6°C)
49.7°F
(9.8°C)
-0.5°F
(-0.2°C)
35th Coolest
Coolest since:
1916
93rd Warmest
Warmest since:
2021
Ties: 1927, 1956, 1968
May–Dec 1931
8-Month
49.7°F
(9.8°C)
49.8°F
(9.9°C)
-0.1°F
(-0.1°C)
47th Coolest
Coolest since:
1916
81st Warmest
Warmest since:
2021
Ties: 1900, 1928, 1944, 1965, 2000
Apr–Dec 1931
9-Month
49.1°F
(9.5°C)
49.0°F
(9.4°C)
0.1°F
(0.1°C)
55th Coolest
Coolest since:
1916
73rd Warmest
Warmest since:
2021
Ties: 1900, 1996
Mar–Dec 1931
10-Month
47.8°F
(8.8°C)
47.7°F
(8.7°C)
0.1°F
(0.1°C)
58th Coolest
Coolest since:
1916
70th Warmest
Warmest since:
2015
Ties: 1950, 1952, 2009
Feb–Dec 1931
11-Month
46.2°F
(7.9°C)
46.1°F
(7.8°C)
0.1°F
(0.1°C)
58th Coolest
Coolest since:
1955
70th Warmest
Warmest since:
2015
Ties: 1907, 1918, 1930, 1936, 1968, 1969, 1989, 2008, 2019
Jan–Dec 1931
12-Month
44.8°F
(7.1°C)
44.5°F
(6.9°C)
0.3°F
(0.2°C)
73rd Coolest
Coolest since:
1916
55th Warmest
Warmest since:
2015
Ties: 1918, 1977, 1996
Jul 1930–Dec 1931
18-Month
45.7°F
(7.6°C)
45.8°F
(7.7°C)
-0.1°F
(-0.1°C)
50th Coolest
Coolest since:
1985
77th Warmest
Warmest since:
2015
Ties: 1904, 1921, 1936, 1942, 1951, 1973, 1983
Jan 1930–Dec 1931
24-Month
44.1°F
(6.7°C)
44.4°F
(6.9°C)
-0.3°F
(-0.2°C)
38th Coolest
Coolest since:
1917
89th Warmest
Warmest since:
2015
Ties: 1900, 1919, 1928, 1932, 1943, 1944, 1964, 1971, 1983, 1984
Jan 1929–Dec 1931
36-Month
43.7°F
(6.5°C)
44.4°F
(6.9°C)
-0.7°F
(-0.4°C)
20th Coolest
Coolest since:
1913
106th Warmest
Warmest since:
2016
Ties: 1909, 1916, 1921
Jan 1928–Dec 1931
48-Month
43.9°F
(6.6°C)
44.5°F
(6.9°C)
-0.6°F
(-0.3°C)
24th Coolest
Coolest since:
1913, 1914, 1919
101st Warmest
Warmest since:
2016, 2017
Ties: 1900, 1904, 1933
Jan 1927–Dec 1931
60-Month
43.8°F
(6.6°C)
44.4°F
(6.9°C)
-0.6°F
(-0.3°C)
17th Coolest
Coolest since:
1913
107th Warmest
Warmest since:
2018
Ties: 1903, 1932

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