Regional Rankings

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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: 2011	1977
	60.8°F (16.0°C)	60.7°F (15.9°C)	0.1°F (0.1°C)	76th Warmest	Warmest since: 2014	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: 2011	1967
	58.8°F (14.9°C)	57.4°F (14.1°C)	1.4°F (0.8°C)	41st Warmest	Warmest since: 2014	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: 2012	1917
	58.1°F (14.5°C)	54.5°F (12.5°C)	3.6°F (2.0°C)	8th Warmest	Warmest since: 2014	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: 2014	1917
Feb–May 2015 4-Month	56.9°F (13.8°C)	52.2°F (11.2°C)	4.7°F (2.6°C)	2nd Warmest	Warmest since: 1934	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: 2014	1917
Jan–May 2015 5-Month	55.2°F (12.9°C)	50.2°F (10.1°C)	5.0°F (2.8°C)	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: 2014	1917
Dec 2014–May 2015 6-Month	53.8°F (12.1°C)	49.0°F (9.4°C)	4.8°F (2.7°C)	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: 2014	1917
Nov 2014–May 2015 7-Month	53.7°F (12.1°C)	49.1°F (9.5°C)	4.6°F (2.6°C)	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: 2014	1917
Oct 2014–May 2015 8-Month	55.1°F (12.8°C)	50.5°F (10.3°C)	4.6°F (2.5°C)	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: 2014	1917
Sep 2014–May 2015 9-Month	57.0°F (13.9°C)	52.5°F (11.4°C)	4.5°F (2.5°C)	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: 2014	1917
Aug 2014–May 2015 10-Month	58.8°F (14.9°C)	54.6°F (12.6°C)	4.2°F (2.3°C)	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: 2014	1917
Jul 2014–May 2015 11-Month	60.5°F (15.8°C)	56.3°F (13.5°C)	4.2°F (2.3°C)	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: 2014	1917
Jun 2014–May 2015 12-Month	61.5°F (16.4°C)	57.4°F (14.1°C)	4.1°F (2.3°C)	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: 2014	1917
Dec 2013–May 2015 18-Month	58.8°F (14.9°C)	54.6°F (12.6°C)	4.2°F (2.3°C)	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: 2014	1913, 1917
Jun 2013–May 2015 24-Month	60.9°F (16.1°C)	57.3°F (14.1°C)	3.6°F (2.0°C)	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: 2014	1913, 1917
Jun 2012–May 2015 36-Month	60.5°F (15.8°C)	57.4°F (14.1°C)	3.1°F (1.7°C)	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: 2014	1913
Jun 2011–May 2015 48-Month	60.0°F (15.6°C)	57.3°F (14.1°C)	2.7°F (1.5°C)	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: 2014	1913, 1917
Jun 2010–May 2015 60-Month	59.5°F (15.3°C)	57.3°F (14.1°C)	2.2°F (1.2°C)	8th Warmest	Warmest to Date	2018

Citing This Page

NOAA National Centers for Environmental information, Climate at a Glance: Regional Rankings, published January 2023, retrieved on February 4, 2023 from https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/regional/rankings