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 1918

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Period Value 1901-2000
Mean		 Anomaly Rank
(1895-2022)		 Warmest/Coolest
Since		 Record
May 1918
1-Month 		57.3°F
(14.1°C)		 60.7°F
(15.9°C)		 -3.4°F
(-1.8°C)		 14th Coolest
Coolest since:
 1977
115th Warmest
Warmest since:
 2001
Ties: 1971
Apr–May 1918
2-Month 		55.6°F
(13.1°C)		 57.4°F
(14.1°C)		 -1.8°F
(-1.0°C)		 22nd Coolest
Coolest since:
 1967
107th Warmest
Warmest since:
 1992
Ties: 1899, 1983
Mar–May 1918
3-Month 		53.3°F
(11.8°C)		 54.5°F
(12.5°C)		 -1.2°F
(-0.7°C)		 33rd Coolest
Coolest since:
 1917
96th Warmest
Warmest since:
 1934
Ties: 1908, 1980
Feb–May 1918
4-Month 		50.8°F
(10.4°C)		 52.2°F
(11.2°C)		 -1.4°F
(-0.8°C)		 22nd Coolest
Coolest since:
 1917
107th Warmest
Warmest since:
 1934
Ties: 1945, 2011
Jan–May 1918
5-Month 		49.2°F
(9.6°C)		 50.2°F
(10.1°C)		 -1.0°F
(-0.5°C)		 25th Coolest
Coolest since:
 1917
104th Warmest
Warmest since:
 2015
Ties: 1898, 1962
Dec 1917–May 1918
6-Month 		48.8°F
(9.3°C)		 49.1°F
(9.5°C)		 -0.3°F
(-0.2°C)		 48th Coolest
Coolest since:
 1917
80th Warmest
Warmest since:
 2015
Ties: 1897, 1946
Nov 1917–May 1918
7-Month 		49.1°F
(9.5°C)		 49.1°F
(9.5°C)		 0.0°F
(0.0°C)		 57th Coolest
Coolest since:
 1917
71st Warmest
Warmest since:
 2015
Ties: 1901, 1972, 1977
Oct 1917–May 1918
8-Month 		50.8°F
(10.4°C)		 50.4°F
(10.2°C)		 0.4°F
(0.2°C)		 71st Coolest
Coolest since:
 1917
57th Warmest
Warmest since:
 2015
Ties: 1947, 2008
Sep 1917–May 1918
9-Month 		52.8°F
(11.6°C)		 52.4°F
(11.3°C)		 0.4°F
(0.3°C)		 72nd Coolest
Coolest since:
 1917
56th Warmest
Warmest since:
 2015
Ties: 1947, 1961
Aug 1917–May 1918
10-Month 		54.9°F
(12.7°C)		 54.6°F
(12.6°C)		 0.3°F
(0.1°C)		 74th Coolest
Coolest since:
 1917
54th Warmest
Warmest since:
 2015
Ties: 1928, 1947, 1961
Jul 1917–May 1918
11-Month 		57.0°F
(13.9°C)		 56.4°F
(13.6°C)		 0.6°F
(0.3°C)		 84th Coolest
Coolest since:
 1917
44th Warmest
Warmest since:
 2015
Ties: 1931, 1987, 1990, 2001, 2008
Jun 1917–May 1918
12-Month 		58.0°F
(14.4°C)		 57.4°F
(14.1°C)		 0.6°F
(0.3°C)		 82nd Coolest
Coolest since:
 1917
46th Warmest
Warmest to Date
 2015
Ties: 1931, 1936, 1954, 1970, 1990, 1994
Dec 1916–May 1918
18-Month 		53.6°F
(12.0°C)		 54.6°F
(12.6°C)		 -1.0°F
(-0.6°C)		 10th Coolest
Coolest since:
 1917
117th Warmest
Warmest since:
 2015
Ties: 1922, 1923, 1945, 1956
Jun 1916–May 1918
24-Month 		55.9°F
(13.3°C)		 57.4°F
(14.1°C)		 -1.5°F
(-0.8°C)		 4th Coolest
Coolest since:
 1913, 1917
123rd Warmest
Warmest since:
 2015
Jun 1915–May 1918
36-Month 		56.3°F
(13.5°C)		 57.4°F
(14.1°C)		 -1.1°F
(-0.6°C)		 5th Coolest
Coolest since:
 1913, 1917
121st Warmest
Warmest since:
 2016
Ties: 1912, 1914, 1919, 1949
Jun 1914–May 1918
48-Month 		56.3°F
(13.5°C)		 57.4°F
(14.1°C)		 -1.1°F
(-0.6°C)		 2nd Coolest
Coolest since:
 1913
123rd Warmest
Warmest since:
 2016, 2017, 2018
Ties: 1912, 1914, 1915, 1917, 1920
Jun 1913–May 1918
60-Month 		56.6°F
(13.7°C)		 57.3°F
(14.1°C)		 -0.7°F
(-0.4°C)		 12th Coolest
Coolest since:
 1913, 1917
112th Warmest
Warmest since:
 2018
Ties: 1910, 1911, 1924

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