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 1977

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 1977
1-Month
2.05"
(52.07mm)
0.92"
(23.37mm)
1.13"
(28.70mm)
121st Driest
Driest since:
1924
8th Wettest
Wettest since:
1998
Apr–May 1977
2-Month
2.27"
(57.66mm)
2.26"
(57.40mm)
0.01"
(0.26mm)
72nd Driest
Driest since:
1909
57th Wettest
Wettest since:
1896
Ties: 1999
Mar–May 1977
3-Month
3.48"
(88.39mm)
4.59"
(116.59mm)
-1.11"
(-28.20mm)
37th Driest
Driest since:
2008
92nd Wettest
Wettest since:
1995
Ties: 1913
Feb–May 1977
4-Month
4.29"
(108.97mm)
7.31"
(185.67mm)
-3.02"
(-76.70mm)
18th Driest
Driest since:
1997
111th Wettest
Wettest since:
1998
Jan–May 1977
5-Month
5.72"
(145.29mm)
10.29"
(261.37mm)
-4.57"
(-116.08mm)
14th Driest
Driest since:
2022
115th Wettest
Wettest since:
1998
Dec 1976–May 1977
6-Month
6.06"
(153.92mm)
12.84"
(326.14mm)
-6.78"
(-172.22mm)
2nd Driest
Driest since:
1924
126th Wettest
Wettest since:
1995
Nov 1976–May 1977
7-Month
6.63"
(168.40mm)
14.71"
(373.63mm)
-8.08"
(-205.23mm)
1st Driest
Driest since:
1977
127th Wettest
Wettest since:
1995
Oct 1976–May 1977
8-Month
7.36"
(186.94mm)
15.74"
(399.80mm)
-8.38"
(-212.86mm)
1st Driest
Driest since:
1977
127th Wettest
Wettest since:
1983
Sep 1976–May 1977
9-Month
8.87"
(225.30mm)
16.23"
(412.24mm)
-7.36"
(-186.94mm)
3rd Driest
Driest since:
2021
125th Wettest
Wettest since:
1983
Aug 1976–May 1977
10-Month
9.51"
(241.55mm)
16.62"
(422.15mm)
-7.11"
(-180.60mm)
3rd Driest
Driest since:
2021
125th Wettest
Wettest since:
1983
Jul 1976–May 1977
11-Month
10.29"
(261.37mm)
16.95"
(430.53mm)
-6.66"
(-169.16mm)
3rd Driest
Driest since:
2021
125th Wettest
Wettest since:
1983
Jun 1976–May 1977
12-Month
10.58"
(268.73mm)
17.44"
(442.98mm)
-6.86"
(-174.25mm)
3rd Driest
Driest since:
2021
125th Wettest
Wettest since:
1983
Dec 1975–May 1977
18-Month
17.48"
(443.99mm)
30.25"
(768.35mm)
-12.77"
(-324.36mm)
1st Driest
Driest since:
1977
126th Wettest
Wettest since:
1983
Jun 1975–May 1977
24-Month
22.22"
(564.39mm)
34.89"
(886.21mm)
-12.67"
(-321.82mm)
3rd Driest
Driest since:
2022
124th Wettest
Wettest since:
1983
Jun 1974–May 1977
36-Month
39.26"
(997.20mm)
52.30"
(1,328.42mm)
-13.04"
(-331.22mm)
7th Driest
Driest since:
2022
119th Wettest
Wettest since:
1984
Jun 1973–May 1977
48-Month
59.04"
(1,499.62mm)
69.56"
(1,766.82mm)
-10.52"
(-267.20mm)
18th Driest
Driest since:
2015
107th Wettest
Wettest since:
1998
Jun 1972–May 1977
60-Month
79.62"
(2,022.35mm)
86.83"
(2,205.48mm)
-7.21"
(-183.13mm)
38th Driest
Driest since:
1933
86th Wettest
Wettest since:
1999

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