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 1981

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Period Value 1901-2000
Mean
Anomaly Rank
(1895-2022)
Warmest/Coolest
Since
Record
May 1981
1-Month
61.9°F
(16.6°C)
60.7°F
(15.9°C)
1.2°F
(0.7°C)
78th Coolest
Coolest since:
1977
51st Warmest
Warmest since:
2001
Ties: 1900, 1929
Apr–May 1981
2-Month
59.2°F
(15.1°C)
57.4°F
(14.1°C)
1.8°F
(1.0°C)
96th Coolest
Coolest since:
1967
33rd Warmest
Warmest since:
1992
Mar–May 1981
3-Month
55.7°F
(13.2°C)
54.5°F
(12.5°C)
1.2°F
(0.7°C)
89th Coolest
Coolest since:
1917
40th Warmest
Warmest since:
1934
Ties: 1954, 1988
Feb–May 1981
4-Month
53.7°F
(12.1°C)
52.2°F
(11.2°C)
1.5°F
(0.9°C)
92nd Coolest
Coolest since:
1917
37th Warmest
Warmest since:
1934
Jan–May 1981
5-Month
52.3°F
(11.3°C)
50.2°F
(10.1°C)
2.1°F
(1.2°C)
107th Coolest
Coolest since:
1917
22nd Warmest
Warmest since:
2015
Ties: 1984, 2012
Dec 1980–May 1981
6-Month
51.4°F
(10.8°C)
49.1°F
(9.5°C)
2.3°F
(1.3°C)
113th Coolest
Coolest since:
1917
15th Warmest
Warmest since:
2015
Ties: 2020
Nov 1980–May 1981
7-Month
51.4°F
(10.8°C)
49.1°F
(9.5°C)
2.3°F
(1.3°C)
115th Coolest
Coolest since:
1917
13th Warmest
Warmest since:
2015
Oct 1980–May 1981
8-Month
52.7°F
(11.5°C)
50.4°F
(10.2°C)
2.3°F
(1.3°C)
114th Coolest
Coolest since:
1917
14th Warmest
Warmest since:
2015
Ties: 2004
Sep 1980–May 1981
9-Month
54.4°F
(12.4°C)
52.4°F
(11.3°C)
2.0°F
(1.1°C)
111th Coolest
Coolest since:
1917
17th Warmest
Warmest since:
2015
Aug 1980–May 1981
10-Month
56.3°F
(13.5°C)
54.6°F
(12.6°C)
1.7°F
(0.9°C)
109th Coolest
Coolest since:
1917
19th Warmest
Warmest since:
2015
Jul 1980–May 1981
11-Month
58.0°F
(14.4°C)
56.4°F
(13.6°C)
1.6°F
(0.8°C)
108th Coolest
Coolest since:
1917
20th Warmest
Warmest since:
2015
Ties: 2003, 2019
Jun 1980–May 1981
12-Month
58.6°F
(14.8°C)
57.4°F
(14.1°C)
1.2°F
(0.7°C)
104th Coolest
Coolest since:
1917
24th Warmest
Warmest since:
2015
Ties: 1968, 1986, 1989
Dec 1979–May 1981
18-Month
55.8°F
(13.2°C)
54.6°F
(12.6°C)
1.2°F
(0.6°C)
99th Coolest
Coolest since:
1917
28th Warmest
Warmest since:
2015
Ties: 1992, 2008
Jun 1979–May 1981
24-Month
58.4°F
(14.7°C)
57.4°F
(14.1°C)
1.0°F
(0.6°C)
99th Coolest
Coolest since:
1913, 1917
28th Warmest
Warmest since:
2015
Ties: 1940, 1959, 1982, 1987, 1989
Jun 1978–May 1981
36-Month
57.9°F
(14.4°C)
57.4°F
(14.1°C)
0.5°F
(0.3°C)
82nd Coolest
Coolest since:
1913, 1917
44th Warmest
Warmest since:
2016
Ties: 1962, 1995
Jun 1977–May 1981
48-Month
58.1°F
(14.5°C)
57.4°F
(14.1°C)
0.7°F
(0.4°C)
88th Coolest
Coolest since:
1913
37th Warmest
Warmest since:
2016, 2017, 2018
Ties: 1988, 1991
Jun 1976–May 1981
60-Month
57.9°F
(14.4°C)
57.3°F
(14.1°C)
0.6°F
(0.3°C)
81st Coolest
Coolest since:
1913, 1917
43rd Warmest
Warmest since:
2018
Ties: 1940, 1943, 1960, 1985, 1986

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