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.

Northwest Climate Region

Precipitation Rankings, May 1999

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 1999
1-Month
2.21"
(56.13mm)
2.14"
(54.36mm)
0.07"
(1.77mm)
69th Driest
Driest since:
1924
60th Wettest
Wettest since:
1998
Apr–May 1999
2-Month
3.70"
(93.98mm)
4.50"
(114.30mm)
-0.80"
(-20.32mm)
30th Driest
Driest since:
1924
99th Wettest
Wettest since:
1996
Ties: 1936
Mar–May 1999
3-Month
6.71"
(170.43mm)
7.76"
(197.10mm)
-1.05"
(-26.67mm)
35th Driest
Driest since:
1924
94th Wettest
Wettest since:
2011
Feb–May 1999
4-Month
13.87"
(352.30mm)
11.37"
(288.80mm)
2.50"
(63.50mm)
112th Driest
Driest since:
1924
17th Wettest
Wettest since:
1904
Jan–May 1999
5-Month
19.12"
(485.65mm)
15.90"
(403.86mm)
3.22"
(81.79mm)
114th Driest
Driest since:
1924
15th Wettest
Wettest since:
1904
Dec 1998–May 1999
6-Month
25.31"
(642.87mm)
20.54"
(521.72mm)
4.77"
(121.15mm)
115th Driest
Driest since:
1977
13th Wettest
Wettest since:
1997
Nov 1998–May 1999
7-Month
32.63"
(828.80mm)
24.89"
(632.21mm)
7.74"
(196.59mm)
124th Driest
Driest since:
1977
4th Wettest
Wettest since:
1974
Oct 1998–May 1999
8-Month
34.40"
(873.76mm)
27.45"
(697.23mm)
6.95"
(176.53mm)
122nd Driest
Driest since:
1977
6th Wettest
Wettest since:
1974
Sep 1998–May 1999
9-Month
35.65"
(905.51mm)
28.87"
(733.30mm)
6.78"
(172.21mm)
119th Driest
Driest since:
1977
9th Wettest
Wettest since:
1974
Aug 1998–May 1999
10-Month
35.87"
(911.10mm)
29.68"
(753.87mm)
6.19"
(157.23mm)
117th Driest
Driest since:
1977
11th Wettest
Wettest since:
1974
Jul 1998–May 1999
11-Month
36.82"
(935.23mm)
30.40"
(772.16mm)
6.42"
(163.07mm)
117th Driest
Driest since:
1977
11th Wettest
Wettest since:
1974
Jun 1998–May 1999
12-Month
38.78"
(985.01mm)
32.13"
(816.10mm)
6.65"
(168.91mm)
116th Driest
Driest since:
1977
12th Wettest
Wettest since:
1996
Dec 1997–May 1999
18-Month
61.57"
(1,563.88mm)
52.65"
(1,337.31mm)
8.92"
(226.57mm)
118th Driest
Driest since:
1930
9th Wettest
Wettest since:
1997
Jun 1997–May 1999
24-Month
75.74"
(1,923.80mm)
64.28"
(1,632.71mm)
11.46"
(291.09mm)
119th Driest
Driest since:
1930
8th Wettest
Wettest since:
1997
Jun 1996–May 1999
36-Month
117.06"
(2,973.32mm)
96.36"
(2,447.54mm)
20.70"
(525.78mm)
122nd Driest
Driest since:
1931
4th Wettest
Wettest since:
1998
Jun 1995–May 1999
48-Month
160.77"
(4,083.56mm)
128.40"
(3,261.36mm)
32.37"
(822.20mm)
124th Driest
Driest since:
1931
1st Wettest
Wettest to Date
1999
Jun 1994–May 1999
60-Month
196.08"
(4,980.43mm)
160.37"
(4,073.40mm)
35.71"
(907.03mm)
123rd Driest
Driest since:
1933
1st Wettest
Wettest to Date
1999

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