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 1991

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Record Warmest
Period	Value	1901-2000 Mean	Anomaly	Rank (1895-2022)	Warmest/Coolest Since	Record
May 1991 1-Month	57.9°F (14.4°C)	60.7°F (15.9°C)	-2.8°F (-1.5°C)	19th Coolest	Coolest since: 1977	1977
	57.9°F (14.4°C)	60.7°F (15.9°C)	-2.8°F (-1.5°C)	110th Warmest	Warmest since: 1990	2001
	Ties: 1942
Apr–May 1991 2-Month	55.3°F (12.9°C)	57.4°F (14.1°C)	-2.1°F (-1.2°C)	18th Coolest	Coolest since: 1975	1967
Apr–May 1991 2-Month	55.3°F (12.9°C)	57.4°F (14.1°C)	-2.1°F (-1.2°C)	111th Warmest	Warmest since: 1990	1992
Mar–May 1991 3-Month	51.8°F (11.0°C)	54.5°F (12.5°C)	-2.7°F (-1.5°C)	6th Coolest	Coolest since: 1975	1917
Mar–May 1991 3-Month	51.8°F (11.0°C)	54.5°F (12.5°C)	-2.7°F (-1.5°C)	123rd Warmest	Warmest since: 1990	1934
Feb–May 1991 4-Month	51.7°F (10.9°C)	52.2°F (11.2°C)	-0.5°F (-0.3°C)	49th Coolest	Coolest since: 1983	1917
	51.7°F (10.9°C)	52.2°F (11.2°C)	-0.5°F (-0.3°C)	80th Warmest	Warmest since: 1990	1934
	Ties: 1906, 1932
Jan–May 1991 5-Month	50.1°F (10.1°C)	50.2°F (10.1°C)	-0.1°F (0.0°C)	59th Coolest	Coolest since: 1982	1917
	50.1°F (10.1°C)	50.2°F (10.1°C)	-0.1°F (0.0°C)	70th Warmest	Warmest since: 1990	2015
	Ties: 1906, 1916
Dec 1990–May 1991 6-Month	48.2°F (9.0°C)	49.1°F (9.5°C)	-0.9°F (-0.5°C)	32nd Coolest	Coolest since: 1979	1917
	48.2°F (9.0°C)	49.1°F (9.5°C)	-0.9°F (-0.5°C)	96th Warmest	Warmest since: 1990	2015
	Ties: 1921
Nov 1990–May 1991 7-Month	48.4°F (9.1°C)	49.1°F (9.5°C)	-0.7°F (-0.4°C)	33rd Coolest	Coolest since: 1979	1917
	48.4°F (9.1°C)	49.1°F (9.5°C)	-0.7°F (-0.4°C)	95th Warmest	Warmest since: 1990	2015
	Ties: 1942, 1967, 1998
Oct 1990–May 1991 8-Month	50.1°F (10.1°C)	50.4°F (10.2°C)	-0.3°F (-0.1°C)	44th Coolest	Coolest since: 1985	1917
	50.1°F (10.1°C)	50.4°F (10.2°C)	-0.3°F (-0.1°C)	84th Warmest	Warmest since: 1990	2015
	Ties: 1897, 1902, 1908, 1910, 1925, 1935, 1974
Sep 1990–May 1991 9-Month	52.3°F (11.3°C)	52.4°F (11.3°C)	-0.1°F (0.0°C)	51st Coolest	Coolest since: 1985	1917
	52.3°F (11.3°C)	52.4°F (11.3°C)	-0.1°F (0.0°C)	77th Warmest	Warmest since: 1990	2015
	Ties: 1927, 1935, 1957
Aug 1990–May 1991 10-Month	54.4°F (12.4°C)	54.5°F (12.5°C)	-0.1°F (-0.1°C)	48th Coolest	Coolest since: 1985	1917
	54.4°F (12.4°C)	54.5°F (12.5°C)	-0.1°F (-0.1°C)	80th Warmest	Warmest since: 1990	2015
	Ties: 1950, 1958, 1967, 1972, 1985, 1999
Jul 1990–May 1991 11-Month	56.4°F (13.6°C)	56.3°F (13.5°C)	0.1°F (0.1°C)	54th Coolest	Coolest since: 1983	1917
	56.4°F (13.6°C)	56.3°F (13.5°C)	0.1°F (0.1°C)	74th Warmest	Warmest since: 1990	2015
	Ties: 1907, 1927, 1935, 1965, 1966, 1999
Jun 1990–May 1991 12-Month	57.5°F (14.2°C)	57.4°F (14.1°C)	0.1°F (0.1°C)	61st Coolest	Coolest since: 1985	1917
	57.5°F (14.2°C)	57.4°F (14.1°C)	0.1°F (0.1°C)	67th Warmest	Warmest since: 1990	2015
	Ties: 1900, 1958, 1985
Dec 1989–May 1991 18-Month	55.0°F (12.8°C)	54.6°F (12.6°C)	0.4°F (0.2°C)	78th Coolest	Coolest since: 1983	1917
	55.0°F (12.8°C)	54.6°F (12.6°C)	0.4°F (0.2°C)	49th Warmest	Warmest since: 1990	2015
	Ties: 1951, 1968
Jun 1989–May 1991 24-Month	57.8°F (14.3°C)	57.4°F (14.1°C)	0.4°F (0.2°C)	79th Coolest	Coolest since: 1984	1913, 1917
	57.8°F (14.3°C)	57.4°F (14.1°C)	0.4°F (0.2°C)	48th Warmest	Warmest since: 1990	2015
	Ties: 1951, 1968, 1995
Jun 1988–May 1991 36-Month	58.1°F (14.5°C)	57.4°F (14.1°C)	0.7°F (0.4°C)	88th Coolest	Coolest since: 1987	1913, 1917
	58.1°F (14.5°C)	57.4°F (14.1°C)	0.7°F (0.4°C)	38th Warmest	Warmest since: 1990	2016
	Ties: 1987
Jun 1987–May 1991 48-Month	58.1°F (14.5°C)	57.4°F (14.1°C)	0.7°F (0.4°C)	88th Coolest	Coolest since: 1988	1913
	58.1°F (14.5°C)	57.4°F (14.1°C)	0.7°F (0.4°C)	37th Warmest	Warmest since: 1990	2016, 2017, 2018
	Ties: 1981, 1988
Jun 1986–May 1991 60-Month	58.1°F (14.5°C)	57.3°F (14.1°C)	0.8°F (0.4°C)	90th Coolest	Coolest since: 1987	1913, 1917
	58.1°F (14.5°C)	57.3°F (14.1°C)	0.8°F (0.4°C)	34th Warmest	Warmest since: 1990	2018
	Ties: 1961, 1962, 1963, 1982, 2002

Citing This Page

NOAA National Centers for Environmental information, Climate at a Glance: Regional Rankings, published November 2022, retrieved on December 2, 2022 from https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/regional/rankings