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, April 1921

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PeriodValue1901-2000
Mean		AnomalyRank
(1895-2023)		Warmest/Coolest
Since		Record
April 1921
1-Month		38.9°F
(3.8°C)		41.7°F
(5.4°C)		-2.8°F
(-1.6°C)		18th Coolest
Coolest since:
1920
112th Warmest
Warmest since:
1992
Ties: 1958
Mar–Apr 1921
2-Month		37.9°F
(3.3°C)		37.3°F
(2.9°C)		0.6°F
(0.4°C)		70th Coolest
Coolest since:
1917
60th Warmest
Warmest since:
1934, 1992
Ties: 2011
Feb–Apr 1921
3-Month		34.4°F
(1.3°C)		33.4°F
(0.8°C)		1.0°F
(0.5°C)		82nd Coolest
Coolest since:
1903
48th Warmest
Warmest since:
1934
Ties: 1957
Jan–Apr 1921
4-Month		31.8°F
(-0.1°C)		30.3°F
(-0.9°C)		1.5°F
(0.8°C)		92nd Coolest
Coolest since:
1917
38th Warmest
Warmest since:
1934
Ties: 1938, 2022
Dec 1920–Apr 1921
5-Month		29.6°F
(-1.3°C)		28.8°F
(-1.8°C)		0.8°F
(0.5°C)		76th Coolest
Coolest since:
1917
53rd Warmest
Warmest since:
1934
Ties: 1904, 1930, 1967, 1971, 1997
Nov 1920–Apr 1921
6-Month		29.8°F
(-1.2°C)		29.4°F
(-1.4°C)		0.4°F
(0.2°C)		62nd Coolest
Coolest since:
1917
67th Warmest
Warmest since:
1934
Ties: 1946, 2019
Oct 1920–Apr 1921
7-Month		31.7°F
(-0.2°C)		31.7°F
(-0.2°C)		0.0°F
(0.0°C)		53rd Coolest
Coolest since:
1917
76th Warmest
Warmest since:
1934
Ties: 1971, 1976, 1983
Sep 1920–Apr 1921
8-Month		34.6°F
(1.4°C)		34.8°F
(1.6°C)		-0.2°F
(-0.2°C)		50th Coolest
Coolest since:
1917
79th Warmest
Warmest since:
1934
Ties: 1916
Aug 1920–Apr 1921
9-Month		37.6°F
(3.1°C)		38.1°F
(3.4°C)		-0.5°F
(-0.3°C)		38th Coolest
Coolest since:
1917
91st Warmest
Warmest since:
1934
Ties: 1901, 1923, 1944
Jul 1920–Apr 1921
10-Month		40.5°F
(4.7°C)		41.0°F
(5.0°C)		-0.5°F
(-0.3°C)		37th Coolest
Coolest since:
1917
92nd Warmest
Warmest since:
1934
Ties: 1901, 1910, 1916, 1923
Jun 1920–Apr 1921
11-Month		42.2°F
(5.7°C)		42.7°F
(5.9°C)		-0.5°F
(-0.2°C)		38th Coolest
Coolest since:
1917
91st Warmest
Warmest since:
1934
Ties: 1944, 1966, 1968, 1975, 1976
May 1920–Apr 1921
12-Month		43.0°F
(6.1°C)		43.4°F
(6.3°C)		-0.4°F
(-0.2°C)		43rd Coolest
Coolest since:
1917
86th Warmest
Warmest since:
1934, 2015, 2018
Ties: 1900, 1915
Nov 1919–Apr 1921
18-Month		37.5°F
(3.1°C)		38.7°F
(3.7°C)		-1.2°F
(-0.6°C)		16th Coolest
Coolest since:
1913
112th Warmest
Warmest since:
2018
Ties: 1900, 1929
May 1919–Apr 1921
24-Month		42.6°F
(5.9°C)		43.4°F
(6.3°C)		-0.8°F
(-0.4°C)		21st Coolest
Coolest since:
1913
107th Warmest
Warmest since:
2018
Ties: 1906, 1924, 1952, 1969
May 1918–Apr 1921
36-Month		42.5°F
(5.8°C)		43.4°F
(6.3°C)		-0.9°F
(-0.5°C)		15th Coolest
Coolest since:
1914
112th Warmest
Warmest since:
2017, 2018, 2019
Ties: 1909, 1930
May 1917–Apr 1921
48-Month		42.7°F
(5.9°C)		43.4°F
(6.3°C)		-0.7°F
(-0.4°C)		22nd Coolest
Coolest since:
1899, 1915
104th Warmest
Warmest since:
2018
Ties: 1911, 1924, 1952, 1975
May 1916–Apr 1921
60-Month		42.1°F
(5.6°C)		43.4°F
(6.3°C)		-1.3°F
(-0.7°C)		6th Coolest
Coolest since:
1917
119th Warmest
Warmest since:
2018, 2019
Ties: 1913

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