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, September 1917

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PeriodValue1901-2000
Mean		AnomalyRank
(1895-2022)		Warmest/Coolest
Since		Record
September 1917
1-Month		68.7°F
(20.4°C)		68.5°F
(20.3°C)		0.2°F
(0.1°C)		57th Coolest
Coolest since:
1986
72nd Warmest
Warmest since:
2020
Ties: 1923
Aug–Sep 1917
2-Month		71.4°F
(21.9°C)		71.1°F
(21.7°C)		0.3°F
(0.2°C)		58th Coolest
Coolest since:
1900
71st Warmest
Warmest since:
2020
Ties: 1929, 1944, 1953, 1970, 1977, 2005
Jul–Sep 1917
3-Month		73.4°F
(23.0°C)		72.3°F
(22.4°C)		1.1°F
(0.6°C)		91st Coolest
Coolest since:
1900
38th Warmest
Warmest to Date
2022
Ties: 1922, 1939, 1971, 2004
Jun–Sep 1917
4-Month		72.3°F
(22.4°C)		71.3°F
(21.8°C)		1.0°F
(0.6°C)		91st Coolest
Coolest since:
1907
38th Warmest
Warmest to Date
2021
Ties: 1977, 2010
May–Sep 1917
5-Month		69.0°F
(20.6°C)		69.2°F
(20.7°C)		-0.2°F
(-0.1°C)		45th Coolest
Coolest since:
1907
84th Warmest
Warmest since:
2021
Ties: 1896, 1956, 1991, 1993, 1995, 1999
Apr–Sep 1917
6-Month		66.0°F
(18.9°C)		66.7°F
(19.3°C)		-0.7°F
(-0.4°C)		37th Coolest
Coolest since:
1912
92nd Warmest
Warmest since:
2021
Ties: 1914, 1925, 1942, 1971, 1999
Mar–Sep 1917
7-Month		62.8°F
(17.1°C)		64.1°F
(17.8°C)		-1.3°F
(-0.7°C)		13th Coolest
Coolest since:
1912
116th Warmest
Warmest since:
2021
Ties: 1909, 1953
Feb–Sep 1917
8-Month		60.3°F
(15.7°C)		61.8°F
(16.6°C)		-1.5°F
(-0.9°C)		6th Coolest
Coolest since:
1911
123rd Warmest
Warmest since:
2015
Ties: 1933, 1955, 1965, 1975
Jan–Sep 1917
9-Month		57.7°F
(14.3°C)		59.6°F
(15.3°C)		-1.9°F
(-1.0°C)		1st Coolest
Coolest since:
1903, 1911, 1917
128th Warmest
Warmest since:
2015
Ties: 1903, 1911
Dec 1916–Sep 1917
10-Month		55.9°F
(13.3°C)		57.9°F
(14.4°C)		-2.0°F
(-1.1°C)		1st Coolest
Coolest to Date
1917, 1933
127th Warmest
Warmest since:
2015
Ties: 1933
Nov 1916–Sep 1917
11-Month		55.0°F
(12.8°C)		57.2°F
(14.0°C)		-2.2°F
(-1.2°C)		1st Coolest
Coolest to Date
1917
127th Warmest
Warmest since:
2015
Oct 1916–Sep 1917
12-Month		54.9°F
(12.7°C)		57.4°F
(14.1°C)		-2.5°F
(-1.4°C)		1st Coolest
Coolest to Date
1917
127th Warmest
Warmest since:
2015
Apr 1916–Sep 1917
18-Month		58.3°F
(14.6°C)		60.5°F
(15.8°C)		-2.2°F
(-1.2°C)		1st Coolest
Coolest to Date
1917
127th Warmest
Warmest since:
2015
Oct 1915–Sep 1917
24-Month		55.8°F
(13.2°C)		57.4°F
(14.1°C)		-1.6°F
(-0.9°C)		3rd Coolest
Coolest since:
1913, 1949
124th Warmest
Warmest since:
2015
Ties: 1912
Oct 1914–Sep 1917
36-Month		56.0°F
(13.3°C)		57.4°F
(14.1°C)		-1.4°F
(-0.8°C)		2nd Coolest
Coolest since:
1913
124th Warmest
Warmest since:
2016
Oct 1913–Sep 1917
48-Month		56.4°F
(13.6°C)		57.4°F
(14.1°C)		-1.0°F
(-0.5°C)		5th Coolest
Coolest since:
1913
120th Warmest
Warmest since:
2017, 2018
Ties: 1915, 1920
Oct 1912–Sep 1917
60-Month		56.3°F
(13.5°C)		57.4°F
(14.1°C)		-1.1°F
(-0.6°C)		2nd Coolest
Coolest since:
1913
122nd Warmest
Warmest since:
2018
Ties: 1912, 1921

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