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 1991

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Period Value 1901-2000
Mean
Anomaly Rank
(1895-2022)
Warmest/Coolest
Since
Record
December 1991
1-Month
22.1°F
(-5.5°C)
23.0°F
(-5.0°C)
-0.9°F
(-0.5°C)
45th Coolest
Coolest since:
1909
84th Warmest
Warmest since:
1980
Ties: 1952
Nov–Dec 1991
2-Month
26.3°F
(-3.2°C)
27.5°F
(-2.5°C)
-1.2°F
(-0.7°C)
41st Coolest
Coolest since:
1895
88th Warmest
Warmest since:
2017
Ties: 1896
Oct–Dec 1991
3-Month
33.2°F
(0.7°C)
33.5°F
(0.8°C)
-0.3°F
(-0.1°C)
57th Coolest
Coolest since:
1898
72nd Warmest
Warmest since:
1950, 2017
Ties: 1927, 1975
Sep–Dec 1991
4-Month
39.3°F
(4.1°C)
39.2°F
(4.0°C)
0.1°F
(0.1°C)
59th Coolest
Coolest since:
1898, 1912
70th Warmest
Warmest since:
2021
Ties: 1926, 1935, 1947, 1990
Aug–Dec 1991
5-Month
44.7°F
(7.1°C)
44.3°F
(6.8°C)
0.4°F
(0.3°C)
71st Coolest
Coolest since:
1912
58th Warmest
Warmest since:
2021
Ties: 1946, 1959, 1969, 1997
Jul–Dec 1991
6-Month
48.4°F
(9.1°C)
48.1°F
(8.9°C)
0.3°F
(0.2°C)
67th Coolest
Coolest since:
1912
62nd Warmest
Warmest since:
2021
Ties: 1965, 1979, 1990
Jun–Dec 1991
7-Month
50.2°F
(10.1°C)
49.9°F
(9.9°C)
0.3°F
(0.2°C)
69th Coolest
Coolest since:
1912
60th Warmest
Warmest since:
2021
Ties: 1974, 1983, 1997
May–Dec 1991
8-Month
50.3°F
(10.2°C)
50.0°F
(10.0°C)
0.3°F
(0.2°C)
69th Coolest
Coolest since:
1912
60th Warmest
Warmest since:
2021
Ties: 1946, 1949
Apr–Dec 1991
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, 1997, 2009
Mar–Dec 1991
10-Month
47.5°F
(8.6°C)
47.5°F
(8.6°C)
0.0°F
(0.0°C)
58th Coolest
Coolest since:
1912
71st Warmest
Warmest since:
2012
Ties: 1942, 1956, 1969, 1978
Feb–Dec 1991
11-Month
45.9°F
(7.7°C)
45.5°F
(7.5°C)
0.4°F
(0.2°C)
77th Coolest
Coolest since:
1912
52nd Warmest
Warmest since:
2017
Ties: 1900, 1937, 1947, 1950, 1960, 1972, 1997
Jan–Dec 1991
12-Month
43.6°F
(6.4°C)
43.4°F
(6.3°C)
0.2°F
(0.1°C)
59th Coolest
Coolest since:
1895, 1912
70th Warmest
Warmest since:
2012
Ties: 1966, 1967, 1976
Jul 1990–Dec 1991
18-Month
45.2°F
(7.3°C)
45.0°F
(7.2°C)
0.2°F
(0.1°C)
61st Coolest
Coolest since:
1912
67th Warmest
Warmest since:
1934
Ties: 1901, 1907, 1926, 1941, 1966, 1982
Jan 1990–Dec 1991
24-Month
44.2°F
(6.8°C)
43.4°F
(6.3°C)
0.8°F
(0.5°C)
86th Coolest
Coolest since:
1913
42nd Warmest
Warmest since:
2018
Ties: 1936, 1941, 1986, 1992, 2011
Jan 1989–Dec 1991
36-Month
44.4°F
(6.9°C)
43.4°F
(6.3°C)
1.0°F
(0.6°C)
92nd Coolest
Coolest since:
1899, 1913
35th Warmest
Warmest since:
2017
Ties: 1992
Jan 1988–Dec 1991
48-Month
44.4°F
(6.9°C)
43.4°F
(6.3°C)
1.0°F
(0.6°C)
93rd Coolest
Coolest since:
1898
33rd Warmest
Warmest since:
2018
Ties: 1983
Jan 1987–Dec 1991
60-Month
44.4°F
(6.9°C)
43.4°F
(6.3°C)
1.0°F
(0.6°C)
94th Coolest
Coolest since:
1899
31st Warmest
Warmest since:
2018
Ties: 1938, 1989, 1994, 1995

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