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 2018

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PeriodValue1901-2000
Mean
AnomalyRank
(1895-2022)
Warmest/Coolest
Since
Record
May 2018
1-Month
63.0°F
(17.2°C)
60.7°F
(15.9°C)
2.3°F
(1.3°C)
96th Coolest
Coolest since:
1977
33rd Warmest
Warmest since:
2001
Apr–May 2018
2-Month
60.1°F
(15.6°C)
57.4°F
(14.1°C)
2.7°F
(1.5°C)
107th Coolest
Coolest since:
1967
22nd Warmest
Warmest since:
1992
Ties: 1926, 2016
Mar–May 2018
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: 2020
Feb–May 2018
4-Month
53.9°F
(12.2°C)
52.2°F
(11.2°C)
1.7°F
(1.0°C)
101st Coolest
Coolest since:
1917
28th Warmest
Warmest since:
1934
Ties: 1928, 1988, 2009
Jan–May 2018
5-Month
52.9°F
(11.6°C)
50.2°F
(10.1°C)
2.7°F
(1.5°C)
117th Coolest
Coolest since:
1917
12th Warmest
Warmest since:
2015
Ties: 1931
Dec 2017–May 2018
6-Month
52.0°F
(11.1°C)
49.1°F
(9.5°C)
2.9°F
(1.6°C)
122nd Coolest
Coolest since:
1917
6th Warmest
Warmest since:
2015
Ties: 1996
Nov 2017–May 2018
7-Month
52.2°F
(11.2°C)
49.1°F
(9.5°C)
3.1°F
(1.7°C)
123rd Coolest
Coolest since:
1917
5th Warmest
Warmest since:
2015
Ties: 1997
Oct 2017–May 2018
8-Month
53.4°F
(11.9°C)
50.4°F
(10.2°C)
3.0°F
(1.7°C)
122nd Coolest
Coolest since:
1917
6th Warmest
Warmest since:
2015
Ties: 2000
Sep 2017–May 2018
9-Month
55.2°F
(12.9°C)
52.4°F
(11.3°C)
2.8°F
(1.6°C)
120th Coolest
Coolest since:
1917
8th Warmest
Warmest since:
2015
Aug 2017–May 2018
10-Month
57.5°F
(14.2°C)
54.6°F
(12.6°C)
2.9°F
(1.6°C)
123rd Coolest
Coolest since:
1917
5th Warmest
Warmest since:
2015
Ties: 1992
Jul 2017–May 2018
11-Month
59.4°F
(15.2°C)
56.4°F
(13.6°C)
3.0°F
(1.6°C)
125th Coolest
Coolest since:
1917
3rd Warmest
Warmest since:
2015
Ties: 1934
Jun 2017–May 2018
12-Month
60.6°F
(15.9°C)
57.4°F
(14.1°C)
3.2°F
(1.8°C)
126th Coolest
Coolest since:
1917
2nd Warmest
Warmest since:
2015
Dec 2016–May 2018
18-Month
57.3°F
(14.1°C)
54.6°F
(12.6°C)
2.7°F
(1.5°C)
122nd Coolest
Coolest since:
1917
5th Warmest
Warmest since:
2015
Ties: 2014
Jun 2016–May 2018
24-Month
60.1°F
(15.6°C)
57.4°F
(14.1°C)
2.7°F
(1.5°C)
123rd Coolest
Coolest since:
1913, 1917
4th Warmest
Warmest since:
2015
Jun 2015–May 2018
36-Month
60.1°F
(15.6°C)
57.4°F
(14.1°C)
2.7°F
(1.5°C)
122nd Coolest
Coolest since:
1913, 1917
4th Warmest
Warmest since:
2016
Ties: 2022
Jun 2014–May 2018
48-Month
60.4°F
(15.8°C)
57.4°F
(14.1°C)
3.0°F
(1.7°C)
124th Coolest
Coolest since:
1913
1st Warmest
Warmest since:
2016, 2017, 2018
Ties: 2016, 2017
Jun 2013–May 2018
60-Month
60.4°F
(15.8°C)
57.3°F
(14.1°C)
3.1°F
(1.7°C)
123rd Coolest
Coolest since:
1913, 1917
1st Warmest
Warmest to Date
2018

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