Regional Rankings

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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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Record Coolest

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Record Warmest
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: 1990	1909
	22.1°F (-5.5°C)	23.0°F (-5.0°C)	-0.9°F (-0.5°C)	84th Warmest	Warmest since: 1989	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: 1990	1895
	26.3°F (-3.2°C)	27.5°F (-2.5°C)	-1.2°F (-0.7°C)	88th Warmest	Warmest since: 1989	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: 1990	1898
	33.2°F (0.7°C)	33.5°F (0.8°C)	-0.3°F (-0.1°C)	72nd Warmest	Warmest since: 1989	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: 1990	1898, 1912
	39.3°F (4.1°C)	39.2°F (4.0°C)	0.1°F (0.1°C)	70th Warmest	Warmest since: 1990	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: 1990	1912
	44.7°F (7.1°C)	44.3°F (6.8°C)	0.4°F (0.3°C)	58th Warmest	Warmest since: 1989	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: 1990	1912
	48.4°F (9.1°C)	48.1°F (8.9°C)	0.3°F (0.2°C)	62nd Warmest	Warmest since: 1990	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: 1986	1912
	50.2°F (10.1°C)	49.9°F (9.9°C)	0.3°F (0.2°C)	60th Warmest	Warmest since: 1990	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: 1986	1912
	50.3°F (10.2°C)	50.0°F (10.0°C)	0.3°F (0.2°C)	60th Warmest	Warmest since: 1990	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: 1984	1912
	49.2°F (9.6°C)	49.1°F (9.5°C)	0.1°F (0.1°C)	71st Warmest	Warmest since: 1990	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: 1984	1912
	47.5°F (8.6°C)	47.5°F (8.6°C)	0.0°F (0.0°C)	71st Warmest	Warmest since: 1990	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: 1985	1912
	45.9°F (7.7°C)	45.5°F (7.5°C)	0.4°F (0.2°C)	52nd Warmest	Warmest since: 1990	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: 1985	1895, 1912
	43.6°F (6.4°C)	43.4°F (6.3°C)	0.2°F (0.1°C)	70th Warmest	Warmest since: 1990	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: 1985	1912
	45.2°F (7.3°C)	45.0°F (7.2°C)	0.2°F (0.1°C)	67th Warmest	Warmest since: 1990	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: 1986	1913
	44.2°F (6.8°C)	43.4°F (6.3°C)	0.8°F (0.5°C)	42nd Warmest	Warmest since: 1990	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: 1987	1899, 1913
	44.4°F (6.9°C)	43.4°F (6.3°C)	1.0°F (0.6°C)	35th Warmest	Warmest since: 1990	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: 1988	1898
	44.4°F (6.9°C)	43.4°F (6.3°C)	1.0°F (0.6°C)	33rd Warmest	Warmest since: 1990	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: 1989	1899
	44.4°F (6.9°C)	43.4°F (6.3°C)	1.0°F (0.6°C)	31st Warmest	Warmest since: 1990	2018
	Ties: 1938, 1989, 1994, 1995

Citing This Page

NOAA National Centers for Environmental information, Climate at a Glance: Regional Rankings, published March 2023, retrieved on March 23, 2023 from https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/regional/rankings