Regional Rankings

Regional Data Info
Please note, Palmer Indices are not available for NWS Regions. 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 1940

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  • Record Coolest
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  • Top 1/3
  • Top 1/10
  • Record Warmest
Period Value 1901-2000
Mean
Anomaly Rank
(1895-2022)
Warmest/Coolest
Since
Record
April 1940
1-Month
43.4°F
(6.3°C)
41.7°F
(5.4°C)
1.7°F
(0.9°C)
90th Coolest
Coolest since:
1920
39th Warmest
Warmest since:
1992
Ties: 1942, 2020
Mar–Apr 1940
2-Month
39.8°F
(4.3°C)
37.2°F
(2.9°C)
2.6°F
(1.4°C)
105th Coolest
Coolest since:
1917
24th Warmest
Warmest since:
1934, 1992
Feb–Apr 1940
3-Month
35.6°F
(2.0°C)
33.4°F
(0.8°C)
2.2°F
(1.2°C)
101st Coolest
Coolest since:
1903
28th Warmest
Warmest since:
1934
Ties: 1926, 1994, 2005, 2009
Jan–Apr 1940
4-Month
32.2°F
(0.1°C)
30.3°F
(-0.9°C)
1.9°F
(1.0°C)
99th Coolest
Coolest since:
1917
30th Warmest
Warmest since:
1934
Ties: 1911, 2020, 2021
Dec 1939–Apr 1940
5-Month
31.7°F
(-0.2°C)
28.8°F
(-1.8°C)
2.9°F
(1.6°C)
109th Coolest
Coolest since:
1917
19th Warmest
Warmest since:
1934
Nov 1939–Apr 1940
6-Month
32.4°F
(0.2°C)
29.4°F
(-1.4°C)
3.0°F
(1.6°C)
113th Coolest
Coolest since:
1917
15th Warmest
Warmest since:
1934
Ties: 1999
Oct 1939–Apr 1940
7-Month
34.2°F
(1.2°C)
31.7°F
(-0.2°C)
2.5°F
(1.4°C)
110th Coolest
Coolest since:
1917
18th Warmest
Warmest since:
1934
Ties: 2004
Sep 1939–Apr 1940
8-Month
37.1°F
(2.8°C)
34.7°F
(1.5°C)
2.4°F
(1.3°C)
112th Coolest
Coolest since:
1917
16th Warmest
Warmest since:
1934
Ties: 1990, 2004, 2005
Aug 1939–Apr 1940
9-Month
40.2°F
(4.6°C)
38.1°F
(3.4°C)
2.1°F
(1.2°C)
111th Coolest
Coolest since:
1917
17th Warmest
Warmest since:
1934
Ties: 1995
Jul 1939–Apr 1940
10-Month
43.0°F
(6.1°C)
41.0°F
(5.0°C)
2.0°F
(1.1°C)
108th Coolest
Coolest since:
1917
20th Warmest
Warmest since:
1934
Ties: 2006
Jun 1939–Apr 1940
11-Month
44.5°F
(6.9°C)
42.7°F
(5.9°C)
1.8°F
(1.0°C)
105th Coolest
Coolest since:
1917
23rd Warmest
Warmest since:
1934
Ties: 1959, 1986, 1989, 2005, 2007, 2019
May 1939–Apr 1940
12-Month
45.2°F
(7.3°C)
43.4°F
(6.3°C)
1.8°F
(1.0°C)
103rd Coolest
Coolest since:
1917
25th Warmest
Warmest since:
1934, 2015, 2018
Ties: 1935, 1954, 1986, 2005
Nov 1938–Apr 1940
18-Month
39.3°F
(4.1°C)
38.7°F
(3.7°C)
0.6°F
(0.4°C)
73rd Coolest
Coolest since:
1913
54th Warmest
Warmest since:
2018
Ties: 1943, 1951
May 1938–Apr 1940
24-Month
44.0°F
(6.7°C)
43.5°F
(6.4°C)
0.5°F
(0.3°C)
83rd Coolest
Coolest since:
1913
44th Warmest
Warmest since:
2018
Ties: 1934, 1955, 1961, 1983, 2011
May 1937–Apr 1940
36-Month
44.3°F
(6.8°C)
43.4°F
(6.3°C)
0.9°F
(0.5°C)
89th Coolest
Coolest since:
1914
37th Warmest
Warmest since:
2017, 2018, 2019
Ties: 1988, 1989
May 1936–Apr 1940
48-Month
43.9°F
(6.6°C)
43.4°F
(6.3°C)
0.5°F
(0.3°C)
76th Coolest
Coolest since:
1899, 1915
49th Warmest
Warmest since:
2018
Ties: 1935, 1957, 1960, 1978
May 1935–Apr 1940
60-Month
43.8°F
(6.6°C)
43.3°F
(6.3°C)
0.5°F
(0.3°C)
74th Coolest
Coolest since:
1917
50th Warmest
Warmest since:
2018, 2019
Ties: 1936, 1939, 1962

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