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 2020

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PeriodValue1901-2000
Mean
AnomalyRank
(1895-2022)
Warmest/Coolest
Since
Record
May 2020
1-Month
64.6°F
(18.1°C)
60.7°F
(15.9°C)
3.9°F
(2.2°C)
120th Coolest
Coolest since:
1977
9th Warmest
Warmest since:
2001
Ties: 1940, 2006, 2014
Apr–May 2020
2-Month
60.6°F
(15.9°C)
57.4°F
(14.1°C)
3.2°F
(1.8°C)
117th Coolest
Coolest since:
1967
12th Warmest
Warmest since:
1992
Ties: 1910, 1947, 1954
Mar–May 2020
3-Month
56.4°F
(13.6°C)
54.5°F
(12.5°C)
1.9°F
(1.1°C)
94th Coolest
Coolest since:
1917
35th Warmest
Warmest since:
1934
Ties: 2018
Feb–May 2020
4-Month
54.6°F
(12.6°C)
52.2°F
(11.2°C)
2.4°F
(1.4°C)
110th Coolest
Coolest since:
1917
19th Warmest
Warmest since:
1934
Ties: 2021
Jan–May 2020
5-Month
52.7°F
(11.5°C)
50.2°F
(10.1°C)
2.5°F
(1.4°C)
113th Coolest
Coolest since:
1917
16th Warmest
Warmest since:
2015
Dec 2019–May 2020
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: 1981
Nov 2019–May 2020
7-Month
51.6°F
(10.9°C)
49.1°F
(9.5°C)
2.5°F
(1.4°C)
117th Coolest
Coolest since:
1917
11th Warmest
Warmest since:
2015
Oct 2019–May 2020
8-Month
52.5°F
(11.4°C)
50.4°F
(10.2°C)
2.1°F
(1.2°C)
111th Coolest
Coolest since:
1917
17th Warmest
Warmest since:
2015
Ties: 2009
Sep 2019–May 2020
9-Month
54.3°F
(12.4°C)
52.4°F
(11.3°C)
1.9°F
(1.1°C)
110th Coolest
Coolest since:
1917
18th Warmest
Warmest since:
2015
Ties: 1984
Aug 2019–May 2020
10-Month
56.6°F
(13.7°C)
54.6°F
(12.6°C)
2.0°F
(1.1°C)
111th Coolest
Coolest since:
1917
17th Warmest
Warmest since:
2015
Jul 2019–May 2020
11-Month
58.3°F
(14.6°C)
56.4°F
(13.6°C)
1.9°F
(1.0°C)
111th Coolest
Coolest since:
1917
17th Warmest
Warmest since:
2015
Ties: 2017
Jun 2019–May 2020
12-Month
59.3°F
(15.2°C)
57.4°F
(14.1°C)
1.9°F
(1.1°C)
112th Coolest
Coolest since:
1917
16th Warmest
Warmest since:
2015
Ties: 1959, 2000
Dec 2018–May 2020
18-Month
56.1°F
(13.4°C)
54.6°F
(12.6°C)
1.5°F
(0.8°C)
111th Coolest
Coolest since:
1917
16th Warmest
Warmest since:
2015
Ties: 1940, 1941, 1959, 1987, 2001, 2009
Jun 2018–May 2020
24-Month
59.2°F
(15.1°C)
57.4°F
(14.1°C)
1.8°F
(1.0°C)
116th Coolest
Coolest since:
1913, 1917
11th Warmest
Warmest since:
2015
Jun 2017–May 2020
36-Month
59.7°F
(15.4°C)
57.4°F
(14.1°C)
2.3°F
(1.3°C)
120th Coolest
Coolest since:
1913, 1917
6th Warmest
Warmest since:
2016
Ties: 2019, 2021
Jun 2016–May 2020
48-Month
59.6°F
(15.3°C)
57.4°F
(14.1°C)
2.2°F
(1.2°C)
117th Coolest
Coolest since:
1913
8th Warmest
Warmest since:
2016, 2017, 2018
Jun 2015–May 2020
60-Month
59.7°F
(15.4°C)
57.3°F
(14.1°C)
2.4°F
(1.3°C)
117th Coolest
Coolest since:
1913, 1917
7th Warmest
Warmest since:
2018

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