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.

California River Basin

Average Temperature Rankings, May 1938

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PeriodValue1901-2000
Mean
AnomalyRank
(1895-2023)
Warmest/Coolest
Since
Record
May 1938
1-Month
61.1°F
(16.2°C)
60.7°F
(15.9°C)
0.4°F
(0.3°C)
59th Coolest
Coolest since:
1977
71st Warmest
Warmest since:
2001
Ties: 1922, 1923, 1978
Apr–May 1938
2-Month
57.4°F
(14.1°C)
57.4°F
(14.1°C)
0.0°F
(0.0°C)
61st Coolest
Coolest since:
1967
69th Warmest
Warmest since:
1992
Ties: 1960
Mar–May 1938
3-Month
53.4°F
(11.9°C)
54.5°F
(12.5°C)
-1.1°F
(-0.6°C)
36th Coolest
Coolest since:
1917
94th Warmest
Warmest since:
1934
Ties: 1907, 1921, 1929, 1995
Feb–May 1938
4-Month
50.9°F
(10.5°C)
52.2°F
(11.2°C)
-1.3°F
(-0.7°C)
25th Coolest
Coolest since:
1917
105th Warmest
Warmest since:
1934
Ties: 1899, 1920, 1949, 1956, 2010
Jan–May 1938
5-Month
49.6°F
(9.8°C)
50.2°F
(10.1°C)
-0.6°F
(-0.3°C)
37th Coolest
Coolest since:
1917
93rd Warmest
Warmest since:
2015
Ties: 1901, 1920, 1923, 1956, 1982
Dec 1937–May 1938
6-Month
49.1°F
(9.5°C)
49.1°F
(9.5°C)
0.0°F
(0.0°C)
61st Coolest
Coolest since:
1917
68th Warmest
Warmest since:
2015
Ties: 1910, 2008
Nov 1937–May 1938
7-Month
49.4°F
(9.7°C)
49.1°F
(9.5°C)
0.3°F
(0.2°C)
72nd Coolest
Coolest since:
1917
57th Warmest
Warmest since:
2015
Ties: 1958, 1966, 1993
Oct 1937–May 1938
8-Month
50.9°F
(10.5°C)
50.4°F
(10.2°C)
0.5°F
(0.3°C)
77th Coolest
Coolest since:
1917
52nd Warmest
Warmest since:
2015
Ties: 1924, 1936, 1963, 1970
Sep 1937–May 1938
9-Month
53.0°F
(11.7°C)
52.4°F
(11.3°C)
0.6°F
(0.4°C)
82nd Coolest
Coolest since:
1917
47th Warmest
Warmest since:
2015
Ties: 1905, 1941, 2005
Aug 1937–May 1938
10-Month
55.2°F
(12.9°C)
54.6°F
(12.6°C)
0.6°F
(0.3°C)
84th Coolest
Coolest since:
1917
45th Warmest
Warmest since:
2015
Ties: 1936, 1941, 2005
Jul 1937–May 1938
11-Month
57.1°F
(13.9°C)
56.4°F
(13.6°C)
0.7°F
(0.3°C)
90th Coolest
Coolest since:
1917
39th Warmest
Warmest since:
2015
Ties: 1960, 1980, 1988, 1994, 2005
Jun 1937–May 1938
12-Month
58.1°F
(14.5°C)
57.4°F
(14.1°C)
0.7°F
(0.4°C)
86th Coolest
Coolest since:
1917
43rd Warmest
Warmest since:
2015
Ties: 1930, 1987, 2008
Dec 1936–May 1938
18-Month
54.3°F
(12.4°C)
54.6°F
(12.6°C)
-0.3°F
(-0.2°C)
37th Coolest
Coolest since:
1917
91st Warmest
Warmest since:
2015
Ties: 1897, 1907, 1914, 1924, 1948, 1957, 1975
Jun 1936–May 1938
24-Month
57.4°F
(14.1°C)
57.4°F
(14.1°C)
0.0°F
(0.0°C)
54th Coolest
Coolest since:
1913, 1917
74th Warmest
Warmest since:
2015
Ties: 1926, 1932, 1937, 1944, 1963, 1983
Jun 1935–May 1938
36-Month
57.6°F
(14.2°C)
57.4°F
(14.1°C)
0.2°F
(0.1°C)
70th Coolest
Coolest since:
1913, 1917
57th Warmest
Warmest since:
2016
Ties: 1932, 1934, 1968, 1979
Jun 1934–May 1938
48-Month
57.5°F
(14.2°C)
57.4°F
(14.1°C)
0.1°F
(0.1°C)
59th Coolest
Coolest since:
1913
67th Warmest
Warmest since:
2016, 2017, 2018
Ties: 1931, 1935, 1954, 1968, 1978, 1979
Jun 1933–May 1938
60-Month
58.0°F
(14.4°C)
57.3°F
(14.1°C)
0.7°F
(0.3°C)
84th Coolest
Coolest since:
1913, 1917
41st Warmest
Warmest to Date
2018
Ties: 1941, 1984

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