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 1999

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PeriodValue1901-2000
Mean		AnomalyRank
(1895-2022)		Warmest/Coolest
Since		Record
December 1999
1-Month		25.0°F
(-3.9°C)		23.0°F
(-5.0°C)		2.0°F
(1.1°C)		93rd Coolest
Coolest since:
1909
36th Warmest
Warmest since:
1980
Ties: 1940, 1996
Nov–Dec 1999
2-Month		32.1°F
(0.1°C)		27.5°F
(-2.5°C)		4.6°F
(2.6°C)		122nd Coolest
Coolest since:
1895
7th Warmest
Warmest since:
2017
Oct–Dec 1999
3-Month		37.5°F
(3.1°C)		33.5°F
(0.8°C)		4.0°F
(2.3°C)		124th Coolest
Coolest since:
1898
5th Warmest
Warmest since:
1950, 2017
Sep–Dec 1999
4-Month		41.9°F
(5.5°C)		39.2°F
(4.0°C)		2.7°F
(1.5°C)		113th Coolest
Coolest since:
1898, 1912
16th Warmest
Warmest since:
2021
Ties: 1958
Aug–Dec 1999
5-Month		46.5°F
(8.1°C)		44.3°F
(6.8°C)		2.2°F
(1.3°C)		111th Coolest
Coolest since:
1912
18th Warmest
Warmest since:
2021
Ties: 1937, 1950, 1962, 1998
Jul–Dec 1999
6-Month		50.0°F
(10.0°C)		48.1°F
(8.9°C)		1.9°F
(1.1°C)		108th Coolest
Coolest since:
1912
21st Warmest
Warmest since:
2021
Ties: 1937, 1981
Jun–Dec 1999
7-Month		51.4°F
(10.8°C)		49.9°F
(9.9°C)		1.5°F
(0.9°C)		104th Coolest
Coolest since:
1912
25th Warmest
Warmest since:
2021
Ties: 1910, 1934, 1998
May–Dec 1999
8-Month		51.1°F
(10.6°C)		50.0°F
(10.0°C)		1.1°F
(0.6°C)		90th Coolest
Coolest since:
1912
39th Warmest
Warmest since:
2021
Ties: 1962
Apr–Dec 1999
9-Month		49.8°F
(9.9°C)		49.1°F
(9.5°C)		0.7°F
(0.4°C)		81st Coolest
Coolest since:
1912
48th Warmest
Warmest since:
2021
Ties: 1921, 1959, 1992
Mar–Dec 1999
10-Month		48.7°F
(9.3°C)		47.5°F
(8.6°C)		1.2°F
(0.7°C)		97th Coolest
Coolest since:
1912
32nd Warmest
Warmest since:
2012
Ties: 1933, 1936, 1958, 1992, 2013
Feb–Dec 1999
11-Month		47.0°F
(8.3°C)		45.5°F
(7.5°C)		1.5°F
(0.8°C)		104th Coolest
Coolest since:
1912
25th Warmest
Warmest since:
2017
Ties: 1995, 2002, 2004, 2005, 2006
Jan–Dec 1999
12-Month		45.4°F
(7.4°C)		43.4°F
(6.3°C)		2.0°F
(1.1°C)		111th Coolest
Coolest since:
1895, 1912
18th Warmest
Warmest since:
2012
Jul 1998–Dec 1999
18-Month		47.1°F
(8.4°C)		45.0°F
(7.2°C)		2.1°F
(1.2°C)		115th Coolest
Coolest since:
1912
13th Warmest
Warmest since:
1934
Jan 1998–Dec 1999
24-Month		45.2°F
(7.3°C)		43.4°F
(6.3°C)		1.8°F
(1.0°C)		108th Coolest
Coolest since:
1913
20th Warmest
Warmest since:
2018
Ties: 1934, 1996, 2005
Jan 1997–Dec 1999
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, 2009
Jan 1996–Dec 1999
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: 2009, 2013
Jan 1995–Dec 1999
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, 2009

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