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 2020

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PeriodValue1901-2000
Mean		AnomalyRank
(1895-2022)		Warmest/Coolest
Since		Record
September 2020
1-Month		73.9°F
(23.3°C)		68.5°F
(20.3°C)		5.4°F
(3.0°C)		128th Coolest
Coolest since:
1986
1st Warmest
Warmest to Date
2020
Aug–Sep 2020
2-Month		76.4°F
(24.7°C)		71.1°F
(21.7°C)		5.3°F
(3.0°C)		128th Coolest
Coolest since:
1900
1st Warmest
Warmest to Date
2020
Jul–Sep 2020
3-Month		76.4°F
(24.7°C)		72.3°F
(22.4°C)		4.1°F
(2.3°C)		127th Coolest
Coolest since:
1900
2nd Warmest
Warmest to Date
2022
Jun–Sep 2020
4-Month		74.9°F
(23.8°C)		71.3°F
(21.8°C)		3.6°F
(2.0°C)		126th Coolest
Coolest since:
1907
3rd Warmest
Warmest since:
2021
Ties: 2017
May–Sep 2020
5-Month		72.9°F
(22.7°C)		69.2°F
(20.7°C)		3.7°F
(2.0°C)		127th Coolest
Coolest since:
1907
2nd Warmest
Warmest to Date
2021
Apr–Sep 2020
6-Month		70.2°F
(21.2°C)		66.7°F
(19.3°C)		3.5°F
(1.9°C)		127th Coolest
Coolest since:
1912
2nd Warmest
Warmest to Date
2021
Mar–Sep 2020
7-Month		67.0°F
(19.4°C)		64.1°F
(17.8°C)		2.9°F
(1.6°C)		122nd Coolest
Coolest since:
1912
7th Warmest
Warmest since:
2021
Feb–Sep 2020
8-Month		64.8°F
(18.2°C)		61.8°F
(16.6°C)		3.0°F
(1.6°C)		122nd Coolest
Coolest since:
1911
7th Warmest
Warmest since:
2015
Jan–Sep 2020
9-Month		62.6°F
(17.0°C)		59.6°F
(15.3°C)		3.0°F
(1.7°C)		123rd Coolest
Coolest since:
1903, 1911, 1917
6th Warmest
Warmest since:
2015
Ties: 2018
Dec 2019–Sep 2020
10-Month		60.8°F
(16.0°C)		57.9°F
(14.4°C)		2.9°F
(1.6°C)		122nd Coolest
Coolest since:
1917, 1933
6th Warmest
Warmest since:
2015
Nov 2019–Sep 2020
11-Month		60.1°F
(15.6°C)		57.2°F
(14.0°C)		2.9°F
(1.6°C)		122nd Coolest
Coolest since:
1917
6th Warmest
Warmest since:
2015
Ties: 1996
Oct 2019–Sep 2020
12-Month		60.0°F
(15.6°C)		57.4°F
(14.1°C)		2.6°F
(1.5°C)		120th Coolest
Coolest since:
1917
8th Warmest
Warmest since:
2015
Ties: 2016
Apr 2019–Sep 2020
18-Month		62.7°F
(17.1°C)		60.5°F
(15.8°C)		2.2°F
(1.3°C)		119th Coolest
Coolest since:
1917
9th Warmest
Warmest since:
2015
Oct 2018–Sep 2020
24-Month		59.3°F
(15.2°C)		57.4°F
(14.1°C)		1.9°F
(1.1°C)		116th Coolest
Coolest since:
1913, 1949
11th Warmest
Warmest since:
2015
Ties: 2013
Oct 2017–Sep 2020
36-Month		59.7°F
(15.4°C)		57.4°F
(14.1°C)		2.3°F
(1.3°C)		118th Coolest
Coolest since:
1913
8th Warmest
Warmest since:
2016
Oct 2016–Sep 2020
48-Month		59.7°F
(15.4°C)		57.4°F
(14.1°C)		2.3°F
(1.3°C)		118th Coolest
Coolest since:
1913
7th Warmest
Warmest since:
2017, 2018
Ties: 2019
Oct 2015–Sep 2020
60-Month		59.8°F
(15.4°C)		57.4°F
(14.1°C)		2.4°F
(1.3°C)		117th Coolest
Coolest since:
1913
7th Warmest
Warmest since:
2018

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