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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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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