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 1951

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Period Value 1901-2000
Mean		 Anomaly Rank
(1895-2022)		 Wettest/Driest
Since		 Record
December 1951
1-Month 		5.62"
(142.75mm)		 4.63"
(117.60mm)		 0.99"
(25.15mm)		 90th Driest
Driest since:
 1976
39th Wettest
Wettest since:
 1964
Nov–Dec 1951
2-Month 		9.86"
(250.44mm)		 8.97"
(227.84mm)		 0.89"
(22.60mm)		 77th Driest
Driest since:
 1976
52nd Wettest
Wettest since:
 1996
Oct–Dec 1951
3-Month 		14.71"
(373.63mm)		 11.51"
(292.35mm)		 3.20"
(81.28mm)		 110th Driest
Driest since:
 1976
19th Wettest
Wettest since:
 1996
Sep–Dec 1951
4-Month 		15.75"
(400.05mm)		 12.93"
(328.42mm)		 2.82"
(71.63mm)		 105th Driest
Driest since:
 1976
24th Wettest
Wettest since:
 1996
Ties: 1970
Aug–Dec 1951
5-Month 		16.78"
(426.21mm)		 13.73"
(348.74mm)		 3.05"
(77.47mm)		 106th Driest
Driest since:
 1936
23rd Wettest
Wettest since:
 1996
Jul–Dec 1951
6-Month 		17.26"
(438.40mm)		 14.46"
(367.28mm)		 2.80"
(71.12mm)		 105th Driest
Driest since:
 1936
24th Wettest
Wettest since:
 1996
Ties: 1899
Jun–Dec 1951
7-Month 		18.14"
(460.76mm)		 16.18"
(410.97mm)		 1.96"
(49.79mm)		 95th Driest
Driest since:
 1976
34th Wettest
Wettest since:
 1996
May–Dec 1951
8-Month 		20.03"
(508.76mm)		 18.32"
(465.33mm)		 1.71"
(43.43mm)		 88th Driest
Driest since:
 1935
41st Wettest
Wettest since:
 1996
Apr–Dec 1951
9-Month 		21.23"
(539.24mm)		 20.67"
(525.02mm)		 0.56"
(14.22mm)		 73rd Driest
Driest since:
 1976
56th Wettest
Wettest since:
 1996
Mar–Dec 1951
10-Month 		24.52"
(622.81mm)		 23.93"
(607.82mm)		 0.59"
(14.99mm)		 68th Driest
Driest since:
 1976
61st Wettest
Wettest since:
 1996
Feb–Dec 1951
11-Month 		29.12"
(739.65mm)		 27.54"
(699.52mm)		 1.58"
(40.13mm)		 82nd Driest
Driest since:
 1935
47th Wettest
Wettest since:
 1996
Jan–Dec 1951
12-Month 		34.88"
(885.95mm)		 32.07"
(814.58mm)		 2.81"
(71.37mm)		 89th Driest
Driest since:
 1929
40th Wettest
Wettest since:
 1996
Jul 1950–Dec 1951
18-Month 		53.58"
(1,360.93mm)		 46.58"
(1,183.13mm)		 7.00"
(177.80mm)		 113th Driest
Driest since:
 1929
15th Wettest
Wettest since:
 1996
Jan 1950–Dec 1951
24-Month 		74.94"
(1,903.48mm)		 64.19"
(1,630.43mm)		 10.75"
(273.05mm)		 122nd Driest
Driest since:
 1930
6th Wettest
Wettest since:
 1996
Jan 1949–Dec 1951
36-Month 		101.90"
(2,588.26mm)		 96.33"
(2,446.78mm)		 5.57"
(141.48mm)		 103rd Driest
Driest since:
 1930
24th Wettest
Wettest since:
 1997
Jan 1948–Dec 1951
48-Month 		140.96"
(3,580.38mm)		 128.33"
(3,259.58mm)		 12.63"
(320.80mm)		 117th Driest
Driest since:
 1931
9th Wettest
Wettest to Date
 1998
Jan 1947–Dec 1951
60-Month 		171.91"
(4,366.51mm)		 160.34"
(4,072.64mm)		 11.57"
(293.87mm)		 112th Driest
Driest since:
 1932
13th Wettest
Wettest to Date
 1999

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