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 1929

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Period Value 1901-2000
Mean
Anomaly Rank
(1895-2022)
Warmest/Coolest
Since
Record
May 1929
1-Month
61.9°F
(16.6°C)
60.7°F
(15.9°C)
1.2°F
(0.7°C)
78th Coolest
Coolest since:
1977
51st Warmest
Warmest since:
2001
Ties: 1900, 1981
Apr–May 1929
2-Month
56.0°F
(13.3°C)
57.4°F
(14.1°C)
-1.4°F
(-0.8°C)
34th Coolest
Coolest since:
1967
95th Warmest
Warmest since:
1992
Mar–May 1929
3-Month
53.4°F
(11.9°C)
54.5°F
(12.5°C)
-1.1°F
(-0.6°C)
36th Coolest
Coolest since:
1917
93rd Warmest
Warmest since:
1934
Ties: 1907, 1921, 1938, 1995
Feb–May 1929
4-Month
50.5°F
(10.3°C)
52.2°F
(11.2°C)
-1.7°F
(-0.9°C)
16th Coolest
Coolest since:
1917
113th Warmest
Warmest since:
1934
Jan–May 1929
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: 1911, 1948, 1964
Dec 1928–May 1929
6-Month
47.1°F
(8.4°C)
49.1°F
(9.5°C)
-2.0°F
(-1.1°C)
8th Coolest
Coolest since:
1917
120th Warmest
Warmest since:
2015
Ties: 1913, 1975
Nov 1928–May 1929
7-Month
47.4°F
(8.6°C)
49.1°F
(9.5°C)
-1.7°F
(-0.9°C)
9th Coolest
Coolest since:
1917
119th Warmest
Warmest since:
2015
Ties: 1932, 1975
Oct 1928–May 1929
8-Month
48.7°F
(9.3°C)
50.4°F
(10.2°C)
-1.7°F
(-0.9°C)
6th Coolest
Coolest since:
1917
122nd Warmest
Warmest since:
2015
Ties: 1948, 1955
Sep 1928–May 1929
9-Month
51.0°F
(10.6°C)
52.4°F
(11.3°C)
-1.4°F
(-0.7°C)
11th Coolest
Coolest since:
1917
117th Warmest
Warmest since:
2015
Ties: 1920, 1973
Aug 1928–May 1929
10-Month
53.2°F
(11.8°C)
54.6°F
(12.6°C)
-1.4°F
(-0.8°C)
9th Coolest
Coolest since:
1917
119th Warmest
Warmest since:
2015
Ties: 1921, 1942, 1948
Jul 1928–May 1929
11-Month
55.1°F
(12.8°C)
56.4°F
(13.6°C)
-1.3°F
(-0.8°C)
10th Coolest
Coolest since:
1917
118th Warmest
Warmest since:
2015
Ties: 1922
Jun 1928–May 1929
12-Month
56.2°F
(13.4°C)
57.4°F
(14.1°C)
-1.2°F
(-0.7°C)
11th Coolest
Coolest since:
1917
117th Warmest
Warmest since:
2015
Ties: 1908
Dec 1927–May 1929
18-Month
54.2°F
(12.3°C)
54.6°F
(12.6°C)
-0.4°F
(-0.3°C)
31st Coolest
Coolest since:
1917
96th Warmest
Warmest since:
2015
Ties: 1902, 1919, 1942, 1973, 1974
Jun 1927–May 1929
24-Month
56.9°F
(13.8°C)
57.4°F
(14.1°C)
-0.5°F
(-0.3°C)
27th Coolest
Coolest since:
1913, 1917
100th Warmest
Warmest since:
2015
Ties: 1897, 1907, 1946, 1953, 1955, 1973, 1974
Jun 1926–May 1929
36-Month
57.2°F
(14.0°C)
57.4°F
(14.1°C)
-0.2°F
(-0.1°C)
46th Coolest
Coolest since:
1913, 1917
80th Warmest
Warmest since:
2016
Ties: 1906, 1907, 1947, 1958, 1967
Jun 1925–May 1929
48-Month
57.3°F
(14.1°C)
57.4°F
(14.1°C)
-0.1°F
(0.0°C)
49th Coolest
Coolest since:
1913
76th Warmest
Warmest since:
2016, 2017, 2018
Ties: 1926, 1932, 1944, 1972
Jun 1924–May 1929
60-Month
57.3°F
(14.1°C)
57.3°F
(14.1°C)
0.0°F
(0.0°C)
48th Coolest
Coolest since:
1913, 1917
76th Warmest
Warmest since:
2018
Ties: 1932, 1947, 1968

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