Regional Rankings

Regional Data Info
Please note, Palmer Indices are not available for NWS Regions. Palmer Drought Severity Index (PDSI), Palmer Hydrological Drought Index (PHDI), and Palmer Modified Drought Index (PMDI) are not offered for multiple-month time scales.

West Climate Region

Precipitation Rankings, May 1909

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
May 1909
1-Month
0.27"
(6.86mm)
0.92"
(23.37mm)
-0.65"
(-16.51mm)
8th Driest
Driest since:
1924
121st Wettest
Wettest since:
1998
Apr–May 1909
2-Month
0.43"
(10.92mm)
2.26"
(57.40mm)
-1.83"
(-46.48mm)
1st Driest
Driest since:
1909
128th Wettest
Wettest since:
1896
Mar–May 1909
3-Month
2.54"
(64.52mm)
4.59"
(116.59mm)
-2.05"
(-52.07mm)
14th Driest
Driest since:
2008
115th Wettest
Wettest since:
1995
Feb–May 1909
4-Month
6.90"
(175.26mm)
7.31"
(185.67mm)
-0.41"
(-10.41mm)
67th Driest
Driest since:
1997
62nd Wettest
Wettest since:
1998
Jan–May 1909
5-Month
15.26"
(387.60mm)
10.29"
(261.37mm)
4.97"
(126.23mm)
116th Driest
Driest since:
2022
13th Wettest
Wettest since:
1998
Dec 1908–May 1909
6-Month
16.57"
(420.88mm)
12.84"
(326.14mm)
3.73"
(94.74mm)
105th Driest
Driest since:
1924
23rd Wettest
Wettest since:
1995
Nov 1908–May 1909
7-Month
17.69"
(449.33mm)
14.71"
(373.63mm)
2.98"
(75.70mm)
99th Driest
Driest since:
1977
29th Wettest
Wettest since:
1995
Oct 1908–May 1909
8-Month
18.84"
(478.54mm)
15.74"
(399.80mm)
3.10"
(78.74mm)
101st Driest
Driest since:
1977
27th Wettest
Wettest since:
1983
Sep 1908–May 1909
9-Month
19.67"
(499.62mm)
16.23"
(412.24mm)
3.44"
(87.38mm)
105th Driest
Driest since:
2021
23rd Wettest
Wettest since:
1983
Aug 1908–May 1909
10-Month
20.10"
(510.54mm)
16.62"
(422.15mm)
3.48"
(88.39mm)
104th Driest
Driest since:
2021
24th Wettest
Wettest since:
1983
Jul 1908–May 1909
11-Month
20.43"
(518.92mm)
16.95"
(430.53mm)
3.48"
(88.39mm)
104th Driest
Driest since:
2021
24th Wettest
Wettest since:
1983
Jun 1908–May 1909
12-Month
20.77"
(527.56mm)
17.44"
(442.98mm)
3.33"
(84.58mm)
104th Driest
Driest since:
2021
24th Wettest
Wettest since:
1983
Ties: 1915
Dec 1907–May 1909
18-Month
32.71"
(830.83mm)
30.25"
(768.35mm)
2.46"
(62.48mm)
91st Driest
Driest since:
1977
36th Wettest
Wettest since:
1983
Jun 1907–May 1909
24-Month
36.43"
(925.32mm)
34.89"
(886.21mm)
1.54"
(39.11mm)
85th Driest
Driest since:
2022
42nd Wettest
Wettest since:
1983
Jun 1906–May 1909
36-Month
60.75"
(1,543.05mm)
52.30"
(1,328.42mm)
8.45"
(214.63mm)
109th Driest
Driest since:
2022
17th Wettest
Wettest since:
1984
Jun 1905–May 1909
48-Month
81.56"
(2,071.62mm)
69.56"
(1,766.82mm)
12.00"
(304.80mm)
113th Driest
Driest since:
2015
12th Wettest
Wettest since:
1998
Jun 1904–May 1909
60-Month
100.84"
(2,561.34mm)
86.83"
(2,205.48mm)
14.01"
(355.86mm)
110th Driest
Driest since:
1933
14th Wettest
Wettest since:
1999

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