Regional Rankings

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Month:

Region:

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 1939

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Record Warmest
Period	Value	1901-2000 Mean	Anomaly	Rank (1895-2022)	Warmest/Coolest Since	Record
May 1939 1-Month	62.3°F (16.8°C)	60.7°F (15.9°C)	1.6°F (0.9°C)	88th Coolest	Coolest since: 1938	1977
	62.3°F (16.8°C)	60.7°F (15.9°C)	1.6°F (0.9°C)	41st Warmest	Warmest since: 1937	2001
	Ties: 1993, 2022
Apr–May 1939 2-Month	60.3°F (15.7°C)	57.4°F (14.1°C)	2.9°F (1.6°C)	112th Coolest	Coolest since: 1938	1967
	60.3°F (15.7°C)	57.4°F (14.1°C)	2.9°F (1.6°C)	17th Warmest	Warmest since: 1934	1992
	Ties: 2001, 2004
Mar–May 1939 3-Month	56.6°F (13.7°C)	54.5°F (12.5°C)	2.1°F (1.2°C)	97th Coolest	Coolest since: 1938	1917
	56.6°F (13.7°C)	54.5°F (12.5°C)	2.1°F (1.2°C)	32nd Warmest	Warmest since: 1936	1934
	Ties: 1928, 1990
Feb–May 1939 4-Month	52.6°F (11.4°C)	52.2°F (11.2°C)	0.4°F (0.2°C)	71st Coolest	Coolest since: 1938	1917
	52.6°F (11.4°C)	52.2°F (11.2°C)	0.4°F (0.2°C)	58th Warmest	Warmest since: 1936	1934
	Ties: 1907, 1958, 1970
Jan–May 1939 5-Month	50.6°F (10.3°C)	50.2°F (10.1°C)	0.4°F (0.2°C)	70th Coolest	Coolest since: 1938	1917
	50.6°F (10.3°C)	50.2°F (10.1°C)	0.4°F (0.2°C)	59th Warmest	Warmest since: 1936	2015
	Ties: 1985
Dec 1938–May 1939 6-Month	49.8°F (9.9°C)	49.1°F (9.5°C)	0.7°F (0.4°C)	79th Coolest	Coolest since: 1938	1917
	49.8°F (9.9°C)	49.1°F (9.5°C)	0.7°F (0.4°C)	49th Warmest	Warmest since: 1936	2015
	Ties: 1958
Nov 1938–May 1939 7-Month	49.3°F (9.6°C)	49.1°F (9.5°C)	0.2°F (0.1°C)	67th Coolest	Coolest since: 1937	1917
	49.3°F (9.6°C)	49.1°F (9.5°C)	0.2°F (0.1°C)	61st Warmest	Warmest since: 1938	2015
	Ties: 1904, 1925, 1927, 1950, 1961
Oct 1938–May 1939 8-Month	50.4°F (10.2°C)	50.4°F (10.2°C)	0.0°F (0.0°C)	61st Coolest	Coolest since: 1937	1917
	50.4°F (10.2°C)	50.4°F (10.2°C)	0.0°F (0.0°C)	67th Warmest	Warmest since: 1938	2015
	Ties: 1982, 2011
Sep 1938–May 1939 9-Month	52.6°F (11.4°C)	52.4°F (11.3°C)	0.2°F (0.1°C)	68th Coolest	Coolest since: 1937	1917
	52.6°F (11.4°C)	52.4°F (11.3°C)	0.2°F (0.1°C)	60th Warmest	Warmest since: 1938	2015
	Ties: 1966, 1982, 2011
Aug 1938–May 1939 10-Month	54.7°F (12.6°C)	54.6°F (12.6°C)	0.1°F (0.0°C)	68th Coolest	Coolest since: 1937	1917
	54.7°F (12.6°C)	54.6°F (12.6°C)	0.1°F (0.0°C)	60th Warmest	Warmest since: 1938	2015
	Ties: 1900, 1956, 1966, 2010, 2011
Jul 1938–May 1939 11-Month	56.6°F (13.7°C)	56.4°F (13.6°C)	0.2°F (0.1°C)	67th Coolest	Coolest since: 1937	1917
Jul 1938–May 1939 11-Month	56.6°F (13.7°C)	56.4°F (13.6°C)	0.2°F (0.1°C)	61st Warmest	Warmest since: 1938	2015
Jun 1938–May 1939 12-Month	57.7°F (14.3°C)	57.4°F (14.1°C)	0.3°F (0.2°C)	72nd Coolest	Coolest since: 1937	1917
	57.7°F (14.3°C)	57.4°F (14.1°C)	0.3°F (0.2°C)	56th Warmest	Warmest since: 1938	2015
	Ties: 1927, 1928, 1963, 1995, 2010, 2011
Dec 1937–May 1939 18-Month	54.8°F (12.7°C)	54.6°F (12.6°C)	0.2°F (0.1°C)	73rd Coolest	Coolest since: 1938	1917
	54.8°F (12.7°C)	54.6°F (12.6°C)	0.2°F (0.1°C)	54th Warmest	Warmest since: 1936	2015
	Ties: 1905, 1932, 1936, 1943, 1954, 1980
Jun 1937–May 1939 24-Month	57.9°F (14.4°C)	57.4°F (14.1°C)	0.5°F (0.3°C)	82nd Coolest	Coolest since: 1938	1913, 1917
	57.9°F (14.4°C)	57.4°F (14.1°C)	0.5°F (0.3°C)	45th Warmest	Warmest since: 1935	2015
	Ties: 1978, 1979
Jun 1936–May 1939 36-Month	57.5°F (14.2°C)	57.4°F (14.1°C)	0.1°F (0.1°C)	65th Coolest	Coolest since: 1937	1913, 1917
	57.5°F (14.2°C)	57.4°F (14.1°C)	0.1°F (0.1°C)	61st Warmest	Warmest since: 1938	2016
	Ties: 1927, 1943, 1969, 1985
Jun 1935–May 1939 48-Month	57.6°F (14.2°C)	57.4°F (14.1°C)	0.2°F (0.1°C)	68th Coolest	Coolest since: 1938	1913
	57.6°F (14.2°C)	57.4°F (14.1°C)	0.2°F (0.1°C)	57th Warmest	Warmest since: 1937	2016, 2017, 2018
	Ties: 1928, 1971
Jun 1934–May 1939 60-Month	57.5°F (14.2°C)	57.3°F (14.1°C)	0.2°F (0.1°C)	65th Coolest	Coolest since: 1933	1913, 1917
	57.5°F (14.2°C)	57.3°F (14.1°C)	0.2°F (0.1°C)	59th Warmest	Warmest since: 1938	2018
	Ties: 1928, 1930, 1931, 1954, 1970, 1971, 1972, 1978

Citing This Page

NOAA National Centers for Environmental information, Climate at a Glance: Regional Rankings, published May 2023, retrieved on May 28, 2023 from https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/regional/rankings