Regional Rankings

Regional Data Info
Please note, Palmer Indices are not available for NWS Regions. Degree Days are not available for Great Plains, Souther Plains and Gulf Coast Rockies and Westward, River Basins, or Agricultural Belts. Palmer Drought Severity Index (PDSI), Palmer Hydrological Drought Index (PHDI), and Palmer Modified Drought Index (PMDI) are not offered for multiple-month time scales.

Upper Colorado River Basin

Average Temperature Rankings, December 2009

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Period Value 1901-2000
Mean
Anomaly Rank
(1895-2022)
Warmest/Coolest
Since
Record
December 2009
1-Month
18.0°F
(-7.8°C)
23.0°F
(-5.0°C)
-5.0°F
(-2.8°C)
19th Coolest
Coolest since:
1909
110th Warmest
Warmest since:
1980
Ties: 1899, 1913
Nov–Dec 2009
2-Month
27.0°F
(-2.8°C)
27.5°F
(-2.5°C)
-0.5°F
(-0.3°C)
48th Coolest
Coolest since:
1895
81st Warmest
Warmest since:
2017
Ties: 1985
Oct–Dec 2009
3-Month
31.9°F
(-0.1°C)
33.5°F
(0.8°C)
-1.6°F
(-0.9°C)
26th Coolest
Coolest since:
1898
103rd Warmest
Warmest since:
1950, 2017
Ties: 1982, 1984
Sep–Dec 2009
4-Month
38.7°F
(3.7°C)
39.2°F
(4.0°C)
-0.5°F
(-0.3°C)
41st Coolest
Coolest since:
1898, 1912
88th Warmest
Warmest since:
2021
Ties: 1925, 1929, 1992
Aug–Dec 2009
5-Month
44.0°F
(6.7°C)
44.3°F
(6.8°C)
-0.3°F
(-0.1°C)
46th Coolest
Coolest since:
1912
83rd Warmest
Warmest since:
2021
Ties: 1929, 1992
Jul–Dec 2009
6-Month
48.0°F
(8.9°C)
48.1°F
(8.9°C)
-0.1°F
(0.0°C)
54th Coolest
Coolest since:
1912
75th Warmest
Warmest since:
2021
Ties: 1952, 1974
Jun–Dec 2009
7-Month
49.5°F
(9.7°C)
49.9°F
(9.9°C)
-0.4°F
(-0.2°C)
47th Coolest
Coolest since:
1912
82nd Warmest
Warmest since:
2021
Ties: 1929
May–Dec 2009
8-Month
50.2°F
(10.1°C)
50.0°F
(10.0°C)
0.2°F
(0.1°C)
62nd Coolest
Coolest since:
1912
67th Warmest
Warmest since:
2021
Ties: 1926, 1952, 1976, 1985
Apr–Dec 2009
9-Month
49.2°F
(9.6°C)
49.1°F
(9.5°C)
0.1°F
(0.1°C)
58th Coolest
Coolest since:
1912
71st Warmest
Warmest since:
2021
Ties: 1925, 1956, 1979, 1991, 1997
Mar–Dec 2009
10-Month
47.9°F
(8.8°C)
47.5°F
(8.6°C)
0.4°F
(0.2°C)
71st Coolest
Coolest since:
1912
58th Warmest
Warmest since:
2012
Ties: 1900, 1926, 1950, 1985
Feb–Dec 2009
11-Month
46.2°F
(7.9°C)
45.5°F
(7.5°C)
0.7°F
(0.4°C)
84th Coolest
Coolest since:
1912
45th Warmest
Warmest since:
2017
Ties: 1926
Jan–Dec 2009
12-Month
44.5°F
(6.9°C)
43.4°F
(6.3°C)
1.1°F
(0.6°C)
89th Coolest
Coolest since:
1895, 1912
40th Warmest
Warmest since:
2012
Ties: 1988
Jul 2008–Dec 2009
18-Month
46.4°F
(8.0°C)
45.0°F
(7.2°C)
1.4°F
(0.8°C)
102nd Coolest
Coolest since:
1912
26th Warmest
Warmest since:
1934
Ties: 1989, 1990, 2013
Jan 2008–Dec 2009
24-Month
44.1°F
(6.7°C)
43.4°F
(6.3°C)
0.7°F
(0.4°C)
80th Coolest
Coolest since:
1913
48th Warmest
Warmest since:
2018
Ties: 1901
Jan 2007–Dec 2009
36-Month
44.8°F
(7.1°C)
43.4°F
(6.3°C)
1.4°F
(0.8°C)
104th Coolest
Coolest since:
1899, 1913
23rd Warmest
Warmest since:
2017
Ties: 1997, 1999
Jan 2006–Dec 2009
48-Month
44.9°F
(7.2°C)
43.4°F
(6.3°C)
1.5°F
(0.9°C)
105th Coolest
Coolest since:
1898
21st Warmest
Warmest since:
2018
Ties: 1999, 2013
Jan 2005–Dec 2009
60-Month
45.0°F
(7.2°C)
43.4°F
(6.3°C)
1.6°F
(0.9°C)
106th Coolest
Coolest since:
1899
19th Warmest
Warmest since:
2018
Ties: 1998, 1999

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