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 1999

View Period (Months):
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  • Record Wettest
Period Value 1901-2000
Mean
Anomaly Rank
(1895-2022)
Wettest/Driest
Since
Record
May 1999
1-Month
0.50"
(12.70mm)
0.92"
(23.37mm)
-0.42"
(-10.67mm)
30th Driest
Driest since:
1924
99th Wettest
Wettest since:
1998
Ties: 1903, 1919, 1928, 1940
Apr–May 1999
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: 1977
Mar–May 1999
3-Month
3.84"
(97.54mm)
4.59"
(116.59mm)
-0.75"
(-19.05mm)
54th Driest
Driest since:
2008
75th Wettest
Wettest since:
1995
Feb–May 1999
4-Month
7.08"
(179.83mm)
7.31"
(185.67mm)
-0.23"
(-5.84mm)
69th Driest
Driest since:
1997
60th Wettest
Wettest since:
1998
Jan–May 1999
5-Month
9.69"
(246.13mm)
10.29"
(261.37mm)
-0.60"
(-15.24mm)
67th Driest
Driest since:
2022
62nd Wettest
Wettest since:
1998
Dec 1998–May 1999
6-Month
10.83"
(275.08mm)
12.84"
(326.14mm)
-2.01"
(-51.06mm)
49th Driest
Driest since:
1924
79th Wettest
Wettest since:
1995
Nov 1998–May 1999
7-Month
13.74"
(349.00mm)
14.71"
(373.63mm)
-0.97"
(-24.63mm)
62nd Driest
Driest since:
1977
66th Wettest
Wettest since:
1995
Oct 1998–May 1999
8-Month
14.65"
(372.11mm)
15.74"
(399.80mm)
-1.09"
(-27.69mm)
62nd Driest
Driest since:
1977
66th Wettest
Wettest since:
1983
Sep 1998–May 1999
9-Month
15.86"
(402.84mm)
16.23"
(412.24mm)
-0.37"
(-9.40mm)
67th Driest
Driest since:
2021
61st Wettest
Wettest since:
1983
Aug 1998–May 1999
10-Month
16.05"
(407.67mm)
16.62"
(422.15mm)
-0.57"
(-14.48mm)
63rd Driest
Driest since:
2021
65th Wettest
Wettest since:
1983
Jul 1998–May 1999
11-Month
16.53"
(419.86mm)
16.95"
(430.53mm)
-0.42"
(-10.67mm)
67th Driest
Driest since:
2021
61st Wettest
Wettest since:
1983
Jun 1998–May 1999
12-Month
17.71"
(449.83mm)
17.44"
(442.98mm)
0.27"
(6.85mm)
76th Driest
Driest since:
2021
52nd Wettest
Wettest since:
1983
Dec 1997–May 1999
18-Month
40.02"
(1,016.51mm)
30.25"
(768.35mm)
9.77"
(248.16mm)
118th Driest
Driest since:
1977
9th Wettest
Wettest since:
1983
Jun 1997–May 1999
24-Month
46.48"
(1,180.59mm)
34.89"
(886.21mm)
11.59"
(294.38mm)
122nd Driest
Driest since:
2022
5th Wettest
Wettest since:
1983
Jun 1996–May 1999
36-Month
65.36"
(1,660.14mm)
52.30"
(1,328.42mm)
13.06"
(331.72mm)
119th Driest
Driest since:
2022
7th Wettest
Wettest since:
1984
Jun 1995–May 1999
48-Month
84.59"
(2,148.59mm)
69.56"
(1,766.82mm)
15.03"
(381.77mm)
118th Driest
Driest since:
2015
7th Wettest
Wettest since:
1998
Jun 1994–May 1999
60-Month
111.23"
(2,825.24mm)
86.83"
(2,205.48mm)
24.40"
(619.76mm)
123rd Driest
Driest since:
1933
1st Wettest
Wettest to Date
1999

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