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 1911

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Period Value 1901-2000
Mean
Anomaly Rank
(1895-2022)
Warmest/Coolest
Since
Record
May 1911
1-Month
57.1°F
(13.9°C)
60.7°F
(15.9°C)
-3.6°F
(-2.0°C)
12th Coolest
Coolest since:
1977
117th Warmest
Warmest since:
2001
Ties: 1921
Apr–May 1911
2-Month
54.5°F
(12.5°C)
57.4°F
(14.1°C)
-2.9°F
(-1.6°C)
9th Coolest
Coolest since:
1967
120th Warmest
Warmest since:
1992
Mar–May 1911
3-Month
53.0°F
(11.7°C)
54.5°F
(12.5°C)
-1.5°F
(-0.8°C)
24th Coolest
Coolest since:
1917
105th Warmest
Warmest since:
1934
Ties: 1899, 1903, 1909
Feb–May 1911
4-Month
49.8°F
(9.9°C)
52.2°F
(11.2°C)
-2.4°F
(-1.3°C)
7th Coolest
Coolest since:
1917
122nd Warmest
Warmest since:
1934
Ties: 1955
Jan–May 1911
5-Month
48.4°F
(9.1°C)
50.2°F
(10.1°C)
-1.8°F
(-1.0°C)
10th Coolest
Coolest since:
1917
119th Warmest
Warmest since:
2015
Ties: 1929, 1948, 1964
Dec 1910–May 1911
6-Month
47.9°F
(8.8°C)
49.1°F
(9.5°C)
-1.2°F
(-0.7°C)
19th Coolest
Coolest since:
1917
109th Warmest
Warmest since:
2015
Ties: 1898, 1944
Nov 1910–May 1911
7-Month
48.1°F
(8.9°C)
49.1°F
(9.5°C)
-1.0°F
(-0.6°C)
21st Coolest
Coolest since:
1917
107th Warmest
Warmest since:
2015
Ties: 1921
Oct 1910–May 1911
8-Month
49.6°F
(9.8°C)
50.4°F
(10.2°C)
-0.8°F
(-0.4°C)
27th Coolest
Coolest since:
1917
101st Warmest
Warmest since:
2015
Sep 1910–May 1911
9-Month
51.6°F
(10.9°C)
52.4°F
(11.3°C)
-0.8°F
(-0.4°C)
23rd Coolest
Coolest since:
1917
105th Warmest
Warmest since:
2015
Ties: 1899, 1919, 1975
Aug 1910–May 1911
10-Month
53.8°F
(12.1°C)
54.6°F
(12.6°C)
-0.8°F
(-0.5°C)
27th Coolest
Coolest since:
1917
101st Warmest
Warmest since:
2015
Ties: 1971, 1975
Jul 1910–May 1911
11-Month
55.7°F
(13.2°C)
56.4°F
(13.6°C)
-0.7°F
(-0.4°C)
26th Coolest
Coolest since:
1917
102nd Warmest
Warmest since:
2015
Ties: 1932, 1945, 1969, 1983
Jun 1910–May 1911
12-Month
56.6°F
(13.7°C)
57.4°F
(14.1°C)
-0.8°F
(-0.4°C)
21st Coolest
Coolest since:
1917
107th Warmest
Warmest since:
2015
Ties: 1901, 1944, 1952, 1973, 1983
Dec 1909–May 1911
18-Month
54.1°F
(12.3°C)
54.6°F
(12.6°C)
-0.5°F
(-0.3°C)
29th Coolest
Coolest since:
1917
98th Warmest
Warmest since:
2015
Ties: 1983
Jun 1909–May 1911
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, 1916, 1923
Jun 1908–May 1911
36-Month
56.6°F
(13.7°C)
57.4°F
(14.1°C)
-0.8°F
(-0.4°C)
15th Coolest
Coolest since:
1913, 1917
111th Warmest
Warmest since:
2016
Ties: 1904, 1909
Jun 1907–May 1911
48-Month
56.5°F
(13.6°C)
57.4°F
(14.1°C)
-0.9°F
(-0.5°C)
10th Coolest
Coolest to Date
1913
115th Warmest
Warmest since:
2016, 2017, 2018
Ties: 1919, 1950
Jun 1906–May 1911
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, 1918, 1924

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