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 2021

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  • Record Wettest
Period Value 1901-2000
Mean		 Anomaly Rank
(1895-2022)		 Wettest/Driest
Since		 Record
September 2021
1-Month 		0.36"
(9.14mm)		 0.45"
(11.43mm)		 -0.09"
(-2.29mm)		 77th Driest
Driest since:
 1974
52nd Wettest
Wettest since:
 1918
Aug–Sep 2021
2-Month 		0.46"
(11.68mm)		 0.69"
(17.53mm)		 -0.23"
(-5.85mm)		 53rd Driest
Driest since:
 1937, 2018
76th Wettest
Wettest since:
 1983
Ties: 1911, 1922
Jul–Sep 2021
3-Month 		0.75"
(19.05mm)		 0.87"
(22.10mm)		 -0.12"
(-3.05mm)		 66th Driest
Driest since:
 1928
63rd Wettest
Wettest since:
 1976
Ties: 2005
Jun–Sep 2021
4-Month 		0.89"
(22.61mm)		 1.22"
(30.99mm)		 -0.33"
(-8.38mm)		 43rd Driest
Driest since:
 2002
86th Wettest
Wettest since:
 1982
Ties: 1911
May–Sep 2021
5-Month 		1.00"
(25.40mm)		 2.10"
(53.34mm)		 -1.10"
(-27.94mm)		 8th Driest
Driest since:
 1924
121st Wettest
Wettest since:
 1998
Apr–Sep 2021
6-Month 		1.29"
(32.77mm)		 3.74"
(95.00mm)		 -2.45"
(-62.23mm)		 3rd Driest
Driest since:
 1924
126th Wettest
Wettest since:
 1896
Mar–Sep 2021
7-Month 		3.02"
(76.71mm)		 6.95"
(176.53mm)		 -3.93"
(-99.82mm)		 3rd Driest
Driest since:
 2008
126th Wettest
Wettest since:
 1995
Ties: 1966
Feb–Sep 2021
8-Month 		4.41"
(112.01mm)		 10.80"
(274.32mm)		 -6.39"
(-162.31mm)		 1st Driest
Driest since:
 2021
128th Wettest
Wettest since:
 1998
Jan–Sep 2021
9-Month 		8.06"
(204.72mm)		 15.05"
(382.27mm)		 -6.99"
(-177.55mm)		 9th Driest
Driest since:
 2022
120th Wettest
Wettest since:
 1998
Dec 2020–Sep 2021
10-Month 		9.89"
(251.21mm)		 18.67"
(474.22mm)		 -8.78"
(-223.01mm)		 4th Driest
Driest since:
 1924
124th Wettest
Wettest since:
 1983
Nov 2020–Sep 2021
11-Month 		11.08"
(281.43mm)		 21.25"
(539.75mm)		 -10.17"
(-258.32mm)		 3rd Driest
Driest since:
 1924
125th Wettest
Wettest since:
 1983
Oct 2020–Sep 2021
12-Month 		11.13"
(282.70mm)		 22.45"
(570.23mm)		 -11.32"
(-287.53mm)		 3rd Driest
Driest since:
 1924
125th Wettest
Wettest since:
 1983
Apr 2020–Sep 2021
18-Month 		14.67"
(372.62mm)		 26.19"
(665.23mm)		 -11.52"
(-292.61mm)		 1st Driest
Driest since:
 2021
127th Wettest
Wettest since:
 1983
Oct 2019–Sep 2021
24-Month 		26.77"
(679.96mm)		 44.90"
(1,140.46mm)		 -18.13"
(-460.50mm)		 2nd Driest
Driest since:
 1977
125th Wettest
Wettest since:
 1983
Oct 2018–Sep 2021
36-Month 		55.14"
(1,400.56mm)		 67.32"
(1,709.93mm)		 -12.18"
(-309.37mm)		 25th Driest
Driest since:
 2022
101st Wettest
Wettest since:
 1984
Oct 2017–Sep 2021
48-Month 		70.96"
(1,802.38mm)		 89.51"
(2,273.55mm)		 -18.55"
(-471.17mm)		 11th Driest
Driest since:
 2015
114th Wettest
Wettest since:
 1998
Oct 2016–Sep 2021
60-Month 		105.98"
(2,691.89mm)		 111.69"
(2,836.93mm)		 -5.71"
(-145.04mm)		 55th Driest
Driest since:
 1991
69th Wettest
Wettest since:
 1999
Ties: 1976

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