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 1939

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Period Value 1901-2000
Mean		 Anomaly Rank
(1895-2022)		 Warmest/Coolest
Since		 Record
April 1939
1-Month 		45.0°F
(7.2°C)		 41.7°F
(5.4°C)		 3.3°F
(1.8°C)		 108th Coolest
Coolest since:
 1920
21st Warmest
Warmest since:
 1992
Mar–Apr 1939
2-Month 		39.1°F
(3.9°C)		 37.3°F
(2.9°C)		 1.8°F
(1.0°C)		 96th Coolest
Coolest since:
 1917
33rd Warmest
Warmest since:
 1934, 1992
Ties: 1949, 2002
Feb–Apr 1939
3-Month 		31.0°F
(-0.6°C)		 33.4°F
(0.8°C)		 -2.4°F
(-1.4°C)		 20th Coolest
Coolest since:
 1903
109th Warmest
Warmest since:
 1934
Ties: 1965, 1975
Jan–Apr 1939
4-Month 		28.7°F
(-1.8°C)		 30.3°F
(-0.9°C)		 -1.6°F
(-0.9°C)		 29th Coolest
Coolest since:
 1917
100th Warmest
Warmest since:
 1934
Ties: 1899
Dec 1938–Apr 1939
5-Month 		27.9°F
(-2.3°C)		 28.8°F
(-1.8°C)		 -0.9°F
(-0.5°C)		 40th Coolest
Coolest since:
 1917
88th Warmest
Warmest since:
 1934
Nov 1938–Apr 1939
6-Month 		27.5°F
(-2.5°C)		 29.4°F
(-1.4°C)		 -1.9°F
(-1.1°C)		 23rd Coolest
Coolest since:
 1917
105th Warmest
Warmest since:
 1934
Ties: 1909
Oct 1938–Apr 1939
7-Month 		30.3°F
(-0.9°C)		 31.7°F
(-0.2°C)		 -1.4°F
(-0.7°C)		 25th Coolest
Coolest since:
 1917
103rd Warmest
Warmest since:
 1934
Ties: 1948
Sep 1938–Apr 1939
8-Month 		33.8°F
(1.0°C)		 34.8°F
(1.6°C)		 -1.0°F
(-0.6°C)		 29th Coolest
Coolest since:
 1917
99th Warmest
Warmest since:
 1934
Ties: 1985
Aug 1938–Apr 1939
9-Month 		37.3°F
(2.9°C)		 38.1°F
(3.4°C)		 -0.8°F
(-0.5°C)		 32nd Coolest
Coolest since:
 1917
96th Warmest
Warmest since:
 1934
Ties: 1948
Jul 1938–Apr 1939
10-Month 		40.1°F
(4.5°C)		 41.0°F
(5.0°C)		 -0.9°F
(-0.5°C)		 29th Coolest
Coolest since:
 1917
99th Warmest
Warmest since:
 1934
Ties: 1922, 1975, 1984
Jun 1938–Apr 1939
11-Month 		42.0°F
(5.6°C)		 42.7°F
(5.9°C)		 -0.7°F
(-0.3°C)		 32nd Coolest
Coolest since:
 1917
96th Warmest
Warmest since:
 1934
Ties: 1916, 1922, 1974
May 1938–Apr 1939
12-Month 		42.7°F
(5.9°C)		 43.4°F
(6.3°C)		 -0.7°F
(-0.4°C)		 29th Coolest
Coolest since:
 1917
99th Warmest
Warmest since:
 1934, 2015, 2018
Ties: 1910, 1937, 1962, 1966, 1976
Nov 1937–Apr 1939
18-Month 		38.9°F
(3.8°C)		 38.7°F
(3.7°C)		 0.2°F
(0.1°C)		 59th Coolest
Coolest since:
 1913
68th Warmest
Warmest since:
 2018
May 1937–Apr 1939
24-Month 		43.8°F
(6.6°C)		 43.4°F
(6.3°C)		 0.4°F
(0.3°C)		 74th Coolest
Coolest since:
 1913
53rd Warmest
Warmest since:
 2018
Ties: 1902, 1927, 1938, 1944, 1957, 1979
May 1936–Apr 1939
36-Month 		43.4°F
(6.3°C)		 43.4°F
(6.3°C)		 0.0°F
(0.0°C)		 51st Coolest
Coolest since:
 1914
75th Warmest
Warmest since:
 2017, 2018, 2019
Ties: 1927, 1946, 1948, 1967, 1984
May 1935–Apr 1939
48-Month 		43.5°F
(6.4°C)		 43.4°F
(6.3°C)		 0.1°F
(0.1°C)		 58th Coolest
Coolest since:
 1899, 1915
67th Warmest
Warmest since:
 2018
Ties: 1947, 1948, 1967, 1979, 1986
May 1934–Apr 1939
60-Month 		43.8°F
(6.6°C)		 43.4°F
(6.3°C)		 0.4°F
(0.3°C)		 74th Coolest
Coolest since:
 1917
50th Warmest
Warmest since:
 2018, 2019
Ties: 1936, 1940, 1962

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