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 1951

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PeriodValue1901-2000
Mean
AnomalyRank
(1895-2022)
Warmest/Coolest
Since
Record
May 1951
1-Month
61.3°F
(16.3°C)
60.7°F
(15.9°C)
0.6°F
(0.4°C)
67th Coolest
Coolest since:
1977
62nd Warmest
Warmest since:
2001
Ties: 1895, 1983, 1994
Apr–May 1951
2-Month
58.2°F
(14.6°C)
57.4°F
(14.1°C)
0.8°F
(0.5°C)
74th Coolest
Coolest since:
1967
55th Warmest
Warmest since:
1992
Mar–May 1951
3-Month
54.8°F
(12.7°C)
54.5°F
(12.5°C)
0.3°F
(0.2°C)
71st Coolest
Coolest since:
1917
58th Warmest
Warmest since:
1934
Feb–May 1951
4-Month
52.3°F
(11.3°C)
52.2°F
(11.2°C)
0.1°F
(0.1°C)
61st Coolest
Coolest since:
1917
68th Warmest
Warmest since:
1934
Ties: 1905, 2003
Jan–May 1951
5-Month
50.2°F
(10.1°C)
50.2°F
(10.1°C)
0.0°F
(0.0°C)
65th Coolest
Coolest since:
1917
64th Warmest
Warmest since:
2015
Ties: 1904, 1960, 1983
Dec 1950–May 1951
6-Month
49.9°F
(9.9°C)
49.1°F
(9.5°C)
0.8°F
(0.4°C)
83rd Coolest
Coolest since:
1917
45th Warmest
Warmest since:
2015
Ties: 1988, 1989, 2002
Nov 1950–May 1951
7-Month
50.4°F
(10.2°C)
49.1°F
(9.5°C)
1.3°F
(0.7°C)
98th Coolest
Coolest since:
1917
30th Warmest
Warmest since:
2015
Ties: 2006, 2012
Oct 1950–May 1951
8-Month
51.8°F
(11.0°C)
50.4°F
(10.2°C)
1.4°F
(0.8°C)
103rd Coolest
Coolest since:
1917
25th Warmest
Warmest since:
2015
Ties: 1931, 1987, 2002
Sep 1950–May 1951
9-Month
53.6°F
(12.0°C)
52.4°F
(11.3°C)
1.2°F
(0.7°C)
100th Coolest
Coolest since:
1917
28th Warmest
Warmest since:
2015
Ties: 1968, 1980, 1988, 1994
Aug 1950–May 1951
10-Month
55.7°F
(13.2°C)
54.6°F
(12.6°C)
1.1°F
(0.6°C)
99th Coolest
Coolest since:
1917
29th Warmest
Warmest since:
2015
Ties: 1988
Jul 1950–May 1951
11-Month
57.5°F
(14.2°C)
56.4°F
(13.6°C)
1.1°F
(0.6°C)
98th Coolest
Coolest since:
1917
30th Warmest
Warmest since:
2015
Jun 1950–May 1951
12-Month
58.3°F
(14.6°C)
57.4°F
(14.1°C)
0.9°F
(0.5°C)
98th Coolest
Coolest since:
1917
30th Warmest
Warmest since:
2015
Ties: 1943, 1960, 1961, 2001, 2006
Dec 1949–May 1951
18-Month
55.0°F
(12.8°C)
54.6°F
(12.6°C)
0.4°F
(0.2°C)
78th Coolest
Coolest since:
1917
49th Warmest
Warmest since:
2015
Ties: 1968, 1991
Jun 1949–May 1951
24-Month
57.8°F
(14.3°C)
57.4°F
(14.1°C)
0.4°F
(0.2°C)
79th Coolest
Coolest since:
1913, 1917
48th Warmest
Warmest since:
2015
Ties: 1968, 1991, 1995
Jun 1948–May 1951
36-Month
56.9°F
(13.8°C)
57.4°F
(14.1°C)
-0.5°F
(-0.3°C)
24th Coolest
Coolest since:
1913, 1917
102nd Warmest
Warmest since:
2016
Ties: 1900, 1905, 1933, 1966, 1973, 1975
Jun 1947–May 1951
48-Month
56.7°F
(13.7°C)
57.4°F
(14.1°C)
-0.7°F
(-0.4°C)
18th Coolest
Coolest since:
1913
107th Warmest
Warmest since:
2016, 2017, 2018
Ties: 1899, 1903, 1916
Jun 1946–May 1951
60-Month
56.9°F
(13.8°C)
57.3°F
(14.1°C)
-0.4°F
(-0.3°C)
26th Coolest
Coolest since:
1913, 1917
98th Warmest
Warmest since:
2018
Ties: 1900, 1901, 1906, 1907, 1953, 1956

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