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.

Upper Colorado River Basin

Average Temperature Rankings, December 2015

View Period (Months):
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  • Record Coolest
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  • Top 1/3
  • Top 1/10
  • Record Warmest
Period Value 1901-2000
Mean
Anomaly Rank
(1895-2021)
Warmest/Coolest
Since
Record
December 2015
1-Month
22.3°F
(-5.4°C)
23.0°F
(-5.0°C)
-0.7°F
(-0.4°C)
48th Coolest
Coolest since:
1909
80th Warmest
Warmest since:
1980
Ties: 1923
Nov–Dec 2015
2-Month
27.2°F
(-2.7°C)
27.5°F
(-2.5°C)
-0.3°F
(-0.2°C)
50th Coolest
Coolest since:
1895
78th Warmest
Warmest since:
2017
Ties: 1903, 1927, 1935, 2018
Oct–Dec 2015
3-Month
35.2°F
(1.8°C)
33.5°F
(0.8°C)
1.7°F
(1.0°C)
97th Coolest
Coolest since:
1898
31st Warmest
Warmest since:
1950, 2017
Ties: 1901
Sep–Dec 2015
4-Month
41.7°F
(5.4°C)
39.2°F
(4.0°C)
2.5°F
(1.4°C)
109th Coolest
Coolest since:
1898, 1912
19th Warmest
Warmest since:
2021
Ties: 2001
Aug–Dec 2015
5-Month
46.6°F
(8.1°C)
44.3°F
(6.8°C)
2.3°F
(1.3°C)
111th Coolest
Coolest since:
1912
17th Warmest
Warmest since:
2021
Jul–Dec 2015
6-Month
49.8°F
(9.9°C)
48.1°F
(8.9°C)
1.7°F
(1.0°C)
103rd Coolest
Coolest since:
1912
25th Warmest
Warmest since:
2021
Ties: 2005
Jun–Dec 2015
7-Month
52.0°F
(11.1°C)
49.8°F
(9.9°C)
2.2°F
(1.2°C)
114th Coolest
Coolest since:
1912
14th Warmest
Warmest since:
2021
Ties: 1981
May–Dec 2015
8-Month
51.7°F
(10.9°C)
50.0°F
(10.0°C)
1.7°F
(0.9°C)
107th Coolest
Coolest since:
1912
21st Warmest
Warmest since:
2021
Apr–Dec 2015
9-Month
50.9°F
(10.5°C)
49.1°F
(9.5°C)
1.8°F
(1.0°C)
110th Coolest
Coolest since:
1912
18th Warmest
Warmest since:
2021
Ties: 1963, 1988, 1989
Mar–Dec 2015
10-Month
49.9°F
(9.9°C)
47.5°F
(8.6°C)
2.4°F
(1.3°C)
117th Coolest
Coolest since:
1912
11th Warmest
Warmest since:
2012
Feb–Dec 2015
11-Month
48.4°F
(9.1°C)
45.5°F
(7.5°C)
2.9°F
(1.6°C)
123rd Coolest
Coolest since:
1912
5th Warmest
Warmest since:
2017
Ties: 2007
Jan–Dec 2015
12-Month
46.7°F
(8.2°C)
43.4°F
(6.3°C)
3.3°F
(1.9°C)
124th Coolest
Coolest since:
1895, 1912
4th Warmest
Warmest since:
2012
Ties: 2021
Jul 2014–Dec 2015
18-Month
48.0°F
(8.9°C)
45.0°F
(7.2°C)
3.0°F
(1.7°C)
122nd Coolest
Coolest since:
1912
5th Warmest
Warmest since:
1934
Ties: 2012
Jan 2014–Dec 2015
24-Month
46.4°F
(8.0°C)
43.5°F
(6.4°C)
2.9°F
(1.6°C)
124th Coolest
Coolest since:
1913
3rd Warmest
Warmest to Date
2018
Ties: 2016, 2021
Jan 2013–Dec 2015
36-Month
45.6°F
(7.6°C)
43.4°F
(6.3°C)
2.2°F
(1.3°C)
117th Coolest
Coolest since:
1899, 1913
9th Warmest
Warmest since:
2017
Ties: 2005, 2007, 2021
Jan 2012–Dec 2015
48-Month
46.0°F
(7.8°C)
43.4°F
(6.3°C)
2.6°F
(1.5°C)
122nd Coolest
Coolest since:
1898
3rd Warmest
Warmest to Date
2018
Ties: 2019
Jan 2011–Dec 2015
60-Month
45.6°F
(7.6°C)
43.4°F
(6.3°C)
2.2°F
(1.3°C)
115th Coolest
Coolest since:
1899
9th Warmest
Warmest since:
2018
Ties: 2007

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