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 1916

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Period Value 1901-2000
Mean
Anomaly Rank
(1895-2022)
Warmest/Coolest
Since
Record
May 1916
1-Month
57.8°F
(14.3°C)
60.7°F
(15.9°C)
-2.9°F
(-1.6°C)
18th Coolest
Coolest since:
1977
111th Warmest
Warmest since:
2001
Apr–May 1916
2-Month
56.7°F
(13.7°C)
57.4°F
(14.1°C)
-0.7°F
(-0.4°C)
50th Coolest
Coolest since:
1967
79th Warmest
Warmest since:
1992
Ties: 1945
Mar–May 1916
3-Month
54.9°F
(12.7°C)
54.5°F
(12.5°C)
0.4°F
(0.2°C)
72nd Coolest
Coolest since:
1917
57th Warmest
Warmest since:
1934
Feb–May 1916
4-Month
53.1°F
(11.7°C)
52.2°F
(11.2°C)
0.9°F
(0.5°C)
81st Coolest
Coolest since:
1917
48th Warmest
Warmest since:
1934
Ties: 2008
Jan–May 1916
5-Month
50.1°F
(10.1°C)
50.2°F
(10.1°C)
-0.1°F
(0.0°C)
59th Coolest
Coolest since:
1917
70th Warmest
Warmest since:
2015
Ties: 1906, 1991
Dec 1915–May 1916
6-Month
48.9°F
(9.4°C)
49.1°F
(9.5°C)
-0.2°F
(-0.1°C)
51st Coolest
Coolest since:
1917
77th Warmest
Warmest since:
2015
Ties: 1907, 1956, 1957, 1983, 1985
Nov 1915–May 1916
7-Month
48.8°F
(9.3°C)
49.1°F
(9.5°C)
-0.3°F
(-0.2°C)
50th Coolest
Coolest since:
1917
78th Warmest
Warmest since:
2015
Ties: 1956, 1974, 2010
Oct 1915–May 1916
8-Month
50.3°F
(10.2°C)
50.4°F
(10.2°C)
-0.1°F
(0.0°C)
56th Coolest
Coolest since:
1917
72nd Warmest
Warmest since:
2015
Ties: 1946, 1950, 1956, 1958
Sep 1915–May 1916
9-Month
52.0°F
(11.1°C)
52.4°F
(11.3°C)
-0.4°F
(-0.2°C)
39th Coolest
Coolest since:
1917
89th Warmest
Warmest since:
2015
Ties: 1910, 1945, 1967, 1972, 1974, 1998
Aug 1915–May 1916
10-Month
54.3°F
(12.4°C)
54.6°F
(12.6°C)
-0.3°F
(-0.2°C)
45th Coolest
Coolest since:
1917
83rd Warmest
Warmest since:
2015
Ties: 1907, 1998
Jul 1915–May 1916
11-Month
56.0°F
(13.3°C)
56.4°F
(13.6°C)
-0.4°F
(-0.3°C)
39th Coolest
Coolest since:
1917
89th Warmest
Warmest since:
2015
Ties: 1897, 1902, 1923, 1957
Jun 1915–May 1916
12-Month
57.0°F
(13.9°C)
57.4°F
(14.1°C)
-0.4°F
(-0.2°C)
36th Coolest
Coolest since:
1917
92nd Warmest
Warmest since:
2015
Ties: 1919, 1971
Dec 1914–May 1916
18-Month
53.9°F
(12.2°C)
54.6°F
(12.6°C)
-0.7°F
(-0.4°C)
20th Coolest
Coolest since:
1917
107th Warmest
Warmest since:
2015
Ties: 1899, 1910, 1953
Jun 1914–May 1916
24-Month
56.7°F
(13.7°C)
57.4°F
(14.1°C)
-0.7°F
(-0.4°C)
19th Coolest
Coolest since:
1913, 1917
108th Warmest
Warmest since:
2015
Ties: 1908, 1911, 1923
Jun 1913–May 1916
36-Month
57.1°F
(13.9°C)
57.4°F
(14.1°C)
-0.3°F
(-0.2°C)
38th Coolest
Coolest since:
1913, 1917
88th Warmest
Warmest since:
2016
Ties: 1920, 1925, 1945, 1964, 1965, 1976, 1977
Jun 1912–May 1916
48-Month
56.7°F
(13.7°C)
57.4°F
(14.1°C)
-0.7°F
(-0.4°C)
18th Coolest
Coolest since:
1913
107th Warmest
Warmest since:
2016, 2017, 2018
Ties: 1899, 1903, 1951
Jun 1911–May 1916
60-Month
56.4°F
(13.6°C)
57.3°F
(14.1°C)
-0.9°F
(-0.5°C)
5th Coolest
Coolest since:
1913, 1917
119th Warmest
Warmest since:
2018
Ties: 1914, 1915, 1920

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