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.

California River Basin

Average Temperature Rankings, May 2015

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  • Record Warmest
Period Value 1901-2000
Mean
Anomaly Rank
(1895-2022)
Warmest/Coolest
Since
Record
May 2015
1-Month
60.8°F
(16.0°C)
60.7°F
(15.9°C)
0.1°F
(0.1°C)
53rd Coolest
Coolest since:
1977
76th Warmest
Warmest since:
2001
Ties: 1956, 1975
Apr–May 2015
2-Month
58.8°F
(14.9°C)
57.4°F
(14.1°C)
1.4°F
(0.8°C)
88th Coolest
Coolest since:
1967
41st Warmest
Warmest since:
1992
Ties: 1952, 1993, 2002, 2006
Mar–May 2015
3-Month
58.1°F
(14.5°C)
54.5°F
(12.5°C)
3.6°F
(2.0°C)
121st Coolest
Coolest since:
1917
8th Warmest
Warmest since:
1934
Ties: 1931
Feb–May 2015
4-Month
56.9°F
(13.8°C)
52.2°F
(11.2°C)
4.7°F
(2.6°C)
127th Coolest
Coolest since:
1917
2nd Warmest
Warmest since:
1934
Jan–May 2015
5-Month
55.2°F
(12.9°C)
50.2°F
(10.1°C)
5.0°F
(2.8°C)
128th Coolest
Coolest since:
1917
1st Warmest
Warmest to Date
2015
Dec 2014–May 2015
6-Month
53.8°F
(12.1°C)
49.0°F
(9.4°C)
4.8°F
(2.7°C)
127th Coolest
Coolest since:
1917
1st Warmest
Warmest to Date
2015
Nov 2014–May 2015
7-Month
53.7°F
(12.1°C)
49.1°F
(9.5°C)
4.6°F
(2.6°C)
127th Coolest
Coolest since:
1917
1st Warmest
Warmest to Date
2015
Oct 2014–May 2015
8-Month
55.1°F
(12.8°C)
50.5°F
(10.3°C)
4.6°F
(2.5°C)
127th Coolest
Coolest since:
1917
1st Warmest
Warmest to Date
2015
Sep 2014–May 2015
9-Month
57.0°F
(13.9°C)
52.5°F
(11.4°C)
4.5°F
(2.5°C)
127th Coolest
Coolest since:
1917
1st Warmest
Warmest to Date
2015
Aug 2014–May 2015
10-Month
58.8°F
(14.9°C)
54.6°F
(12.6°C)
4.2°F
(2.3°C)
127th Coolest
Coolest since:
1917
1st Warmest
Warmest to Date
2015
Jul 2014–May 2015
11-Month
60.5°F
(15.8°C)
56.3°F
(13.5°C)
4.2°F
(2.3°C)
127th Coolest
Coolest since:
1917
1st Warmest
Warmest to Date
2015
Jun 2014–May 2015
12-Month
61.5°F
(16.4°C)
57.4°F
(14.1°C)
4.1°F
(2.3°C)
127th Coolest
Coolest since:
1917
1st Warmest
Warmest to Date
2015
Dec 2013–May 2015
18-Month
58.8°F
(14.9°C)
54.6°F
(12.6°C)
4.2°F
(2.3°C)
126th Coolest
Coolest since:
1917
1st Warmest
Warmest to Date
2015
Jun 2013–May 2015
24-Month
60.9°F
(16.1°C)
57.3°F
(14.1°C)
3.6°F
(2.0°C)
126th Coolest
Coolest since:
1913, 1917
1st Warmest
Warmest to Date
2015
Jun 2012–May 2015
36-Month
60.5°F
(15.8°C)
57.4°F
(14.1°C)
3.1°F
(1.7°C)
124th Coolest
Coolest since:
1913, 1917
2nd Warmest
Warmest to Date
2016
Jun 2011–May 2015
48-Month
60.0°F
(15.6°C)
57.3°F
(14.1°C)
2.7°F
(1.5°C)
121st Coolest
Coolest since:
1913
4th Warmest
Warmest to Date
2016, 2017, 2018
Jun 2010–May 2015
60-Month
59.5°F
(15.3°C)
57.3°F
(14.1°C)
2.2°F
(1.2°C)
116th Coolest
Coolest since:
1913, 1917
8th Warmest
Warmest to Date
2018

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