Statewide Rankings

Statewide Data Info
Please note, Degree Days and Palmer Indices are not available for Alaska. 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

Precipitation Rankings, September 2020

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  • Record Wettest
Period Value 1901-2000
Mean		 Anomaly Rank
(1895-2022)		 Wettest/Driest
Since		 Record
September 2020
1-Month 		0.04"
(1.02mm)		 0.45"
(11.43mm)		 -0.41"
(-10.41mm)		 2nd Driest
Driest since:
 1974
127th Wettest
Wettest since:
 1918
Ties: 1953, 1970, 1993, 2008
Aug–Sep 2020
2-Month 		0.14"
(3.56mm)		 0.69"
(17.53mm)		 -0.55"
(-13.97mm)		 8th Driest
Driest since:
 1937, 2018
121st Wettest
Wettest since:
 1983
Ties: 1987
Jul–Sep 2020
3-Month 		0.19"
(4.83mm)		 0.87"
(22.10mm)		 -0.68"
(-17.27mm)		 3rd Driest
Driest since:
 1928
126th Wettest
Wettest since:
 1976
Jun–Sep 2020
4-Month 		0.35"
(8.89mm)		 1.22"
(30.99mm)		 -0.87"
(-22.10mm)		 4th Driest
Driest since:
 2002
125th Wettest
Wettest since:
 1982
May–Sep 2020
5-Month 		1.55"
(39.37mm)		 2.10"
(53.34mm)		 -0.55"
(-13.97mm)		 39th Driest
Driest since:
 1924
90th Wettest
Wettest since:
 1998
Apr–Sep 2020
6-Month 		3.54"
(89.92mm)		 3.74"
(95.00mm)		 -0.20"
(-5.08mm)		 74th Driest
Driest since:
 1924
55th Wettest
Wettest since:
 1896
Ties: 1952
Mar–Sep 2020
7-Month 		6.73"
(170.94mm)		 6.95"
(176.53mm)		 -0.22"
(-5.59mm)		 74th Driest
Driest since:
 2008
55th Wettest
Wettest since:
 1995
Feb–Sep 2020
8-Month 		6.94"
(176.28mm)		 10.80"
(274.32mm)		 -3.86"
(-98.04mm)		 20th Driest
Driest since:
 2021
109th Wettest
Wettest since:
 1998
Jan–Sep 2020
9-Month 		9.00"
(228.60mm)		 15.05"
(382.27mm)		 -6.05"
(-153.67mm)		 19th Driest
Driest since:
 2022
110th Wettest
Wettest since:
 1998
Dec 2019–Sep 2020
10-Month 		13.87"
(352.30mm)		 18.67"
(474.22mm)		 -4.80"
(-121.92mm)		 29th Driest
Driest since:
 1924
99th Wettest
Wettest since:
 1983
Nov 2019–Sep 2020
11-Month 		15.48"
(393.19mm)		 21.25"
(539.75mm)		 -5.77"
(-146.56mm)		 21st Driest
Driest since:
 1924
107th Wettest
Wettest since:
 1983
Ties: 2018
Oct 2019–Sep 2020
12-Month 		15.64"
(397.26mm)		 22.45"
(570.23mm)		 -6.81"
(-172.97mm)		 14th Driest
Driest since:
 1924
114th Wettest
Wettest since:
 1983
Apr 2019–Sep 2020
18-Month 		20.27"
(514.86mm)		 26.19"
(665.23mm)		 -5.92"
(-150.37mm)		 29th Driest
Driest since:
 2021
99th Wettest
Wettest since:
 1983
Oct 2018–Sep 2020
24-Month 		44.01"
(1,117.85mm)		 44.90"
(1,140.46mm)		 -0.89"
(-22.61mm)		 65th Driest
Driest since:
 1977
62nd Wettest
Wettest since:
 1983
Oct 2017–Sep 2020
36-Month 		59.83"
(1,519.68mm)		 67.32"
(1,709.93mm)		 -7.49"
(-190.25mm)		 38th Driest
Driest since:
 2022
88th Wettest
Wettest since:
 1984
Oct 2016–Sep 2020
48-Month 		94.85"
(2,409.19mm)		 89.51"
(2,273.55mm)		 5.34"
(135.64mm)		 87th Driest
Driest since:
 2015
38th Wettest
Wettest since:
 1998
Oct 2015–Sep 2020
60-Month 		117.57"
(2,986.28mm)		 111.69"
(2,836.93mm)		 5.88"
(149.35mm)		 86th Driest
Driest since:
 1991
38th Wettest
Wettest since:
 1999

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