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 2018

View Period (Months):
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  • Record Driest
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  • Record Wettest
Period Value 1901-2000
Mean
Anomaly Rank
(1895-2022)
Wettest/Driest
Since
Record
September 2018
1-Month
0.06"
(1.52mm)
0.45"
(11.43mm)
-0.39"
(-9.91mm)
9th Driest
Driest since:
1974
120th Wettest
Wettest since:
1918
Ties: 2006
Aug–Sep 2018
2-Month
0.10"
(2.54mm)
0.69"
(17.53mm)
-0.59"
(-14.99mm)
1st Driest
Driest since:
1937, 2018
128th Wettest
Wettest since:
1983
Ties: 1937
Jul–Sep 2018
3-Month
0.32"
(8.13mm)
0.87"
(22.10mm)
-0.55"
(-13.97mm)
13th Driest
Driest since:
1928
116th Wettest
Wettest since:
1976
Ties: 1924, 1943
Jun–Sep 2018
4-Month
0.39"
(9.91mm)
1.22"
(30.99mm)
-0.83"
(-21.08mm)
6th Driest
Driest since:
2002
123rd Wettest
Wettest since:
1982
May–Sep 2018
5-Month
1.05"
(26.67mm)
2.10"
(53.34mm)
-1.05"
(-26.67mm)
11th Driest
Driest since:
1924
118th Wettest
Wettest since:
1998
Apr–Sep 2018
6-Month
3.18"
(80.77mm)
3.74"
(95.00mm)
-0.56"
(-14.23mm)
51st Driest
Driest since:
1924
78th Wettest
Wettest since:
1896
Ties: 1939
Mar–Sep 2018
7-Month
8.30"
(210.82mm)
6.95"
(176.53mm)
1.35"
(34.29mm)
97th Driest
Driest since:
2008
32nd Wettest
Wettest since:
1995
Feb–Sep 2018
8-Month
8.87"
(225.30mm)
10.80"
(274.32mm)
-1.93"
(-49.02mm)
52nd Driest
Driest since:
2021
77th Wettest
Wettest since:
1998
Ties: 1903, 2016
Jan–Sep 2018
9-Month
12.20"
(309.88mm)
15.05"
(382.27mm)
-2.85"
(-72.39mm)
49th Driest
Driest since:
2022
80th Wettest
Wettest since:
1998
Dec 2017–Sep 2018
10-Month
12.50"
(317.50mm)
18.67"
(474.22mm)
-6.17"
(-156.72mm)
17th Driest
Driest since:
1924
111th Wettest
Wettest since:
1983
Nov 2017–Sep 2018
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: 2020
Oct 2017–Sep 2018
12-Month
15.82"
(401.83mm)
22.45"
(570.23mm)
-6.63"
(-168.40mm)
16th Driest
Driest since:
1924
112th Wettest
Wettest since:
1983
Apr 2017–Sep 2018
18-Month
20.06"
(509.52mm)
26.19"
(665.23mm)
-6.13"
(-155.71mm)
26th Driest
Driest since:
2021
102nd Wettest
Wettest since:
1983
Oct 2016–Sep 2018
24-Month
50.84"
(1,291.34mm)
44.90"
(1,140.46mm)
5.94"
(150.88mm)
100th Driest
Driest since:
1977
27th Wettest
Wettest since:
1983
Oct 2015–Sep 2018
36-Month
73.56"
(1,868.42mm)
67.32"
(1,709.93mm)
6.24"
(158.49mm)
92nd Driest
Driest since:
2022
34th Wettest
Wettest since:
1984
Oct 2014–Sep 2018
48-Month
90.34"
(2,294.64mm)
89.51"
(2,273.55mm)
0.83"
(21.09mm)
74th Driest
Driest since:
2015
51st Wettest
Wettest since:
1998
Oct 2013–Sep 2018
60-Month
102.73"
(2,609.34mm)
111.69"
(2,836.93mm)
-8.96"
(-227.59mm)
41st Driest
Driest since:
1991
83rd Wettest
Wettest since:
1999

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