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, December 1999

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  • Record Wettest
Period Value 1901-2000
Mean		 Anomaly Rank
(1895-2022)		 Wettest/Driest
Since		 Record
December 1999
1-Month 		4.16"
(105.66mm)		 4.63"
(117.60mm)		 -0.47"
(-11.94mm)		 53rd Driest
Driest since:
 1976
76th Wettest
Wettest since:
 1964
Nov–Dec 1999
2-Month 		8.89"
(225.81mm)		 8.97"
(227.84mm)		 -0.08"
(-2.03mm)		 65th Driest
Driest since:
 1976
64th Wettest
Wettest since:
 1996
Oct–Dec 1999
3-Month 		11.05"
(280.67mm)		 11.51"
(292.35mm)		 -0.46"
(-11.68mm)		 53rd Driest
Driest since:
 1976
76th Wettest
Wettest since:
 1996
Sep–Dec 1999
4-Month 		11.24"
(285.50mm)		 12.93"
(328.42mm)		 -1.69"
(-42.92mm)		 38th Driest
Driest since:
 1976
91st Wettest
Wettest since:
 1996
Aug–Dec 1999
5-Month 		12.39"
(314.71mm)		 13.73"
(348.74mm)		 -1.34"
(-34.03mm)		 44th Driest
Driest since:
 1936
85th Wettest
Wettest since:
 1996
Jul–Dec 1999
6-Month 		12.82"
(325.63mm)		 14.46"
(367.28mm)		 -1.64"
(-41.65mm)		 42nd Driest
Driest since:
 1936
87th Wettest
Wettest since:
 1996
Jun–Dec 1999
7-Month 		14.28"
(362.71mm)		 16.18"
(410.97mm)		 -1.90"
(-48.26mm)		 41st Driest
Driest since:
 1976
88th Wettest
Wettest since:
 1996
May–Dec 1999
8-Month 		16.49"
(418.85mm)		 18.32"
(465.33mm)		 -1.83"
(-46.48mm)		 42nd Driest
Driest since:
 1935
87th Wettest
Wettest since:
 1996
Apr–Dec 1999
9-Month 		17.98"
(456.69mm)		 20.67"
(525.02mm)		 -2.69"
(-68.33mm)		 29th Driest
Driest since:
 1976
100th Wettest
Wettest since:
 1996
Mar–Dec 1999
10-Month 		20.99"
(533.15mm)		 23.93"
(607.82mm)		 -2.94"
(-74.67mm)		 30th Driest
Driest since:
 1976
99th Wettest
Wettest since:
 1996
Feb–Dec 1999
11-Month 		28.15"
(715.01mm)		 27.54"
(699.52mm)		 0.61"
(15.49mm)		 69th Driest
Driest since:
 1935
60th Wettest
Wettest since:
 1996
Jan–Dec 1999
12-Month 		33.40"
(848.36mm)		 32.07"
(814.58mm)		 1.33"
(33.78mm)		 81st Driest
Driest since:
 1929
48th Wettest
Wettest since:
 1996
Jul 1998–Dec 1999
18-Month 		51.10"
(1,297.94mm)		 46.58"
(1,183.13mm)		 4.52"
(114.81mm)		 102nd Driest
Driest since:
 1929
26th Wettest
Wettest since:
 1996
Jan 1998–Dec 1999
24-Month 		73.16"
(1,858.26mm)		 64.19"
(1,630.43mm)		 8.97"
(227.83mm)		 118th Driest
Driest since:
 1930
10th Wettest
Wettest since:
 1996
Jan 1997–Dec 1999
36-Month 		108.31"
(2,751.07mm)		 96.33"
(2,446.78mm)		 11.98"
(304.29mm)		 119th Driest
Driest since:
 1930
8th Wettest
Wettest since:
 1997
Jan 1996–Dec 1999
48-Month 		153.18"
(3,890.77mm)		 128.33"
(3,259.58mm)		 24.85"
(631.19mm)		 124th Driest
Driest since:
 1931
2nd Wettest
Wettest since:
 1998
Jan 1995–Dec 1999
60-Month 		193.76"
(4,921.50mm)		 160.34"
(4,072.64mm)		 33.42"
(848.86mm)		 124th Driest
Driest since:
 1932
1st Wettest
Wettest to Date
 1999

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