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 1999

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  • Top 1/10
  • Record Warmest
Period Value 1901-2000
Mean
Anomaly Rank
(1895-2021)
Warmest/Coolest
Since
Record
December 1999
1-Month
31.0°F
(-0.6°C)
28.1°F
(-2.2°C)
2.9°F
(1.6°C)
105th Coolest
Coolest since:
1990
23rd Warmest
Warmest since:
1917
Ties: 1966, 2019
Nov–Dec 1999
2-Month
35.8°F
(2.1°C)
31.4°F
(-0.3°C)
4.4°F
(2.4°C)
125th Coolest
Coolest since:
1985
3rd Warmest
Warmest since:
1917
Ties: 1933
Oct–Dec 1999
3-Month
39.6°F
(4.2°C)
36.2°F
(2.3°C)
3.4°F
(1.9°C)
125th Coolest
Coolest since:
1985
3rd Warmest
Warmest since:
1917
Sep–Dec 1999
4-Month
43.7°F
(6.5°C)
41.1°F
(5.1°C)
2.6°F
(1.4°C)
122nd Coolest
Coolest since:
1985
6th Warmest
Warmest since:
1917
Aug–Dec 1999
5-Month
47.9°F
(8.8°C)
45.5°F
(7.5°C)
2.4°F
(1.3°C)
123rd Coolest
Coolest since:
1985
5th Warmest
Warmest since:
1917, 2014
Ties: 2012
Jul–Dec 1999
6-Month
50.4°F
(10.2°C)
48.7°F
(9.3°C)
1.7°F
(0.9°C)
113th Coolest
Coolest since:
1985
15th Warmest
Warmest since:
2014
Ties: 1933, 2001
Jun–Dec 1999
7-Month
51.1°F
(10.6°C)
49.8°F
(9.9°C)
1.3°F
(0.7°C)
105th Coolest
Coolest since:
1916
23rd Warmest
Warmest since:
2021
Ties: 1934, 1974, 1987
May–Dec 1999
8-Month
50.6°F
(10.3°C)
49.8°F
(9.9°C)
0.8°F
(0.4°C)
94th Coolest
Coolest since:
1916
34th Warmest
Warmest since:
2021
Ties: 1938, 1963, 1994
Apr–Dec 1999
9-Month
49.5°F
(9.7°C)
49.0°F
(9.4°C)
0.5°F
(0.3°C)
80th Coolest
Coolest since:
1916
48th Warmest
Warmest since:
2021
Ties: 1941, 1963, 1973, 1977, 1980, 1990, 1995
Mar–Dec 1999
10-Month
48.2°F
(9.0°C)
47.7°F
(8.7°C)
0.5°F
(0.3°C)
83rd Coolest
Coolest since:
1916
45th Warmest
Warmest since:
2015
Ties: 1900, 1904, 1933, 1963, 1973, 1995
Feb–Dec 1999
11-Month
46.6°F
(8.1°C)
46.1°F
(7.8°C)
0.5°F
(0.3°C)
79th Coolest
Coolest since:
1955
49th Warmest
Warmest since:
2015
Ties: 1910, 1953
Jan–Dec 1999
12-Month
45.3°F
(7.4°C)
44.4°F
(6.9°C)
0.9°F
(0.5°C)
91st Coolest
Coolest since:
1916
37th Warmest
Warmest since:
2015
Ties: 1900, 1966, 2000
Jul 1998–Dec 1999
18-Month
47.2°F
(8.4°C)
45.9°F
(7.7°C)
1.3°F
(0.7°C)
110th Coolest
Coolest since:
1985
17th Warmest
Warmest since:
2015
Ties: 1988
Jan 1998–Dec 1999
24-Month
45.8°F
(7.7°C)
44.4°F
(6.9°C)
1.4°F
(0.8°C)
106th Coolest
Coolest since:
1917
21st Warmest
Warmest since:
2015
Ties: 1998, 2006
Jan 1997–Dec 1999
36-Month
45.7°F
(7.6°C)
44.5°F
(6.9°C)
1.2°F
(0.7°C)
109th Coolest
Coolest since:
1913
17th Warmest
Warmest since:
2016
Ties: 1989, 2000, 2019
Jan 1996–Dec 1999
48-Month
45.5°F
(7.5°C)
44.5°F
(6.9°C)
1.0°F
(0.6°C)
102nd Coolest
Coolest since:
1913, 1914, 1919
23rd Warmest
Warmest since:
2016, 2017
Ties: 1994, 1997, 2008
Jan 1995–Dec 1999
60-Month
45.5°F
(7.5°C)
44.4°F
(6.9°C)
1.1°F
(0.6°C)
104th Coolest
Coolest since:
1913
20th Warmest
Warmest since:
2018
Ties: 1941, 1942, 1991, 1995

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