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 1909

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  • Record Warmest
Period Value 1901-2000
Mean
Anomaly Rank
(1895-2021)
Warmest/Coolest
Since
Record
December 1909
1-Month
21.7°F
(-5.7°C)
28.1°F
(-2.2°C)
-6.4°F
(-3.5°C)
7th Coolest
Coolest since:
1990
121st Warmest
Warmest since:
1917
Ties: 1948
Nov–Dec 1909
2-Month
28.8°F
(-1.8°C)
31.3°F
(-0.4°C)
-2.5°F
(-1.4°C)
14th Coolest
Coolest since:
1985
114th Warmest
Warmest since:
1917
Ties: 1935, 1951, 1955, 1992, 1994
Oct–Dec 1909
3-Month
34.4°F
(1.3°C)
36.2°F
(2.3°C)
-1.8°F
(-1.0°C)
21st Coolest
Coolest since:
1985
107th Warmest
Warmest since:
1917
Ties: 1922
Sep–Dec 1909
4-Month
39.9°F
(4.4°C)
41.1°F
(5.1°C)
-1.2°F
(-0.7°C)
26th Coolest
Coolest since:
1985
102nd Warmest
Warmest since:
1917
Aug–Dec 1909
5-Month
44.3°F
(6.8°C)
45.4°F
(7.4°C)
-1.1°F
(-0.6°C)
19th Coolest
Coolest since:
1985
109th Warmest
Warmest since:
1917, 2014
Ties: 1964, 1968, 1971
Jul–Dec 1909
6-Month
47.2°F
(8.4°C)
48.6°F
(9.2°C)
-1.4°F
(-0.8°C)
12th Coolest
Coolest since:
1985
116th Warmest
Warmest since:
2014
Ties: 1898
Jun–Dec 1909
7-Month
48.5°F
(9.2°C)
49.7°F
(9.8°C)
-1.2°F
(-0.6°C)
13th Coolest
Coolest since:
1916
115th Warmest
Warmest since:
2021
May–Dec 1909
8-Month
48.4°F
(9.1°C)
49.8°F
(9.9°C)
-1.4°F
(-0.8°C)
10th Coolest
Coolest since:
1916
118th Warmest
Warmest since:
2021
Apr–Dec 1909
9-Month
47.4°F
(8.6°C)
49.0°F
(9.4°C)
-1.6°F
(-0.8°C)
8th Coolest
Coolest since:
1916
120th Warmest
Warmest since:
2021
Mar–Dec 1909
10-Month
46.3°F
(7.9°C)
47.7°F
(8.7°C)
-1.4°F
(-0.8°C)
9th Coolest
Coolest since:
1916
119th Warmest
Warmest since:
2015
Ties: 1895, 1902, 1919, 1984
Feb–Dec 1909
11-Month
45.0°F
(7.2°C)
46.1°F
(7.8°C)
-1.1°F
(-0.6°C)
16th Coolest
Coolest since:
1955
112th Warmest
Warmest since:
2015
Ties: 1929, 1971, 1982
Jan–Dec 1909
12-Month
43.2°F
(6.2°C)
44.4°F
(6.9°C)
-1.2°F
(-0.7°C)
14th Coolest
Coolest since:
1916
114th Warmest
Warmest since:
2015
Jul 1908–Dec 1909
18-Month
44.9°F
(7.2°C)
45.8°F
(7.7°C)
-0.9°F
(-0.5°C)
17th Coolest
Coolest since:
1985
110th Warmest
Warmest since:
2015
Ties: 1896, 1993
Jan 1908–Dec 1909
24-Month
43.6°F
(6.4°C)
44.4°F
(6.9°C)
-0.8°F
(-0.5°C)
17th Coolest
Coolest since:
1917
110th Warmest
Warmest since:
2015
Ties: 1911, 1929, 1951
Jan 1907–Dec 1909
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: 1916, 1921, 1931
Jan 1906–Dec 1909
48-Month
44.0°F
(6.7°C)
44.4°F
(6.9°C)
-0.4°F
(-0.2°C)
28th Coolest
Coolest since:
1913, 1914, 1919
97th Warmest
Warmest since:
2016, 2017
Ties: 1901, 1902, 1903, 1910, 1921, 1925, 1949, 1956
Jan 1905–Dec 1909
60-Month
44.0°F
(6.7°C)
44.4°F
(6.9°C)
-0.4°F
(-0.2°C)
28th Coolest
Coolest since:
1913
96th Warmest
Warmest since:
2018
Ties: 1901, 1955, 1956, 1957

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