Regional Rankings

Regional Data Info
Please note, Palmer Indices are not available for NWS Regions. Degree Days are not available for Great Plains, Souther Plains and Gulf Coast Rockies and Westward, River Basins, or Agricultural Belts. 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, December 1998

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  • Record Wettest
Period Value 1901-2000
Mean
Anomaly Rank
(1895-2022)
Wettest/Driest
Since
Record
December 1998
1-Month
6.19"
(157.23mm)
4.63"
(117.60mm)
1.56"
(39.63mm)
108th Driest
Driest since:
1976
21st Wettest
Wettest since:
1964
Nov–Dec 1998
2-Month
13.51"
(343.15mm)
8.97"
(227.84mm)
4.54"
(115.31mm)
122nd Driest
Driest since:
1976
7th Wettest
Wettest since:
1996
Oct–Dec 1998
3-Month
15.28"
(388.11mm)
11.51"
(292.35mm)
3.77"
(95.76mm)
115th Driest
Driest since:
1976
14th Wettest
Wettest since:
1996
Sep–Dec 1998
4-Month
16.53"
(419.86mm)
12.93"
(328.42mm)
3.60"
(91.44mm)
113th Driest
Driest since:
1976
16th Wettest
Wettest since:
1996
Aug–Dec 1998
5-Month
16.75"
(425.45mm)
13.73"
(348.74mm)
3.02"
(76.71mm)
105th Driest
Driest since:
1936
24th Wettest
Wettest since:
1996
Jul–Dec 1998
6-Month
17.70"
(449.58mm)
14.46"
(367.28mm)
3.24"
(82.30mm)
107th Driest
Driest since:
1936
22nd Wettest
Wettest since:
1996
Jun–Dec 1998
7-Month
19.66"
(499.36mm)
16.18"
(410.97mm)
3.48"
(88.39mm)
107th Driest
Driest since:
1976
22nd Wettest
Wettest since:
1996
May–Dec 1998
8-Month
24.36"
(618.74mm)
18.32"
(465.33mm)
6.04"
(153.41mm)
125th Driest
Driest since:
1935
4th Wettest
Wettest since:
1996
Apr–Dec 1998
9-Month
26.26"
(667.00mm)
20.67"
(525.02mm)
5.59"
(141.98mm)
116th Driest
Driest since:
1976
13th Wettest
Wettest since:
1996
Mar–Dec 1998
10-Month
29.60"
(751.84mm)
23.93"
(607.82mm)
5.67"
(144.02mm)
117th Driest
Driest since:
1976
12th Wettest
Wettest since:
1996
Feb–Dec 1998
11-Month
33.40"
(848.36mm)
27.54"
(699.52mm)
5.86"
(148.84mm)
119th Driest
Driest since:
1935
10th Wettest
Wettest since:
1996
Jan–Dec 1998
12-Month
39.76"
(1,009.90mm)
32.07"
(814.58mm)
7.69"
(195.32mm)
123rd Driest
Driest since:
1929
6th Wettest
Wettest since:
1996
Jul 1997–Dec 1998
18-Month
54.38"
(1,381.25mm)
46.58"
(1,183.13mm)
7.80"
(198.12mm)
116th Driest
Driest since:
1929
12th Wettest
Wettest since:
1996
Jan 1997–Dec 1998
24-Month
74.91"
(1,902.71mm)
64.19"
(1,630.43mm)
10.72"
(272.28mm)
121st Driest
Driest since:
1930
7th Wettest
Wettest since:
1996
Jan 1996–Dec 1998
36-Month
119.78"
(3,042.41mm)
96.33"
(2,446.78mm)
23.45"
(595.63mm)
125th Driest
Driest since:
1930
2nd Wettest
Wettest since:
1997
Jan 1995–Dec 1998
48-Month
160.36"
(4,073.14mm)
128.33"
(3,259.58mm)
32.03"
(813.56mm)
125th Driest
Driest since:
1931
1st Wettest
Wettest to Date
1998
Jan 1994–Dec 1998
60-Month
189.96"
(4,824.98mm)
160.34"
(4,072.64mm)
29.62"
(752.34mm)
123rd Driest
Driest since:
1932
2nd Wettest
Wettest to Date
1999

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