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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