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 1964

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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
December 1964
1-Month 		10.31"
(261.87mm)		 4.63"
(117.60mm)		 5.68"
(144.27mm)		 128th Driest
Driest since:
 1976
1st Wettest
Wettest to Date
 1964
Nov–Dec 1964
2-Month 		15.31"
(388.87mm)		 8.97"
(227.84mm)		 6.34"
(161.03mm)		 126th Driest
Driest since:
 1976
3rd Wettest
Wettest to Date
 1996
Oct–Dec 1964
3-Month 		16.58"
(421.13mm)		 11.51"
(292.35mm)		 5.07"
(128.78mm)		 125th Driest
Driest since:
 1976
4th Wettest
Wettest since:
 1996
Sep–Dec 1964
4-Month 		17.65"
(448.31mm)		 12.93"
(328.42mm)		 4.72"
(119.89mm)		 125th Driest
Driest since:
 1976
4th Wettest
Wettest since:
 1996
Aug–Dec 1964
5-Month 		18.83"
(478.28mm)		 13.73"
(348.74mm)		 5.10"
(129.54mm)		 123rd Driest
Driest since:
 1936
6th Wettest
Wettest since:
 1996
Jul–Dec 1964
6-Month 		19.81"
(503.17mm)		 14.46"
(367.28mm)		 5.35"
(135.89mm)		 124th Driest
Driest since:
 1936
5th Wettest
Wettest since:
 1996
Ties: 1977
Jun–Dec 1964
7-Month 		22.90"
(581.66mm)		 16.18"
(410.97mm)		 6.72"
(170.69mm)		 127th Driest
Driest since:
 1976
2nd Wettest
Wettest to Date
 1996
May–Dec 1964
8-Month 		24.35"
(618.49mm)		 18.32"
(465.33mm)		 6.03"
(153.16mm)		 124th Driest
Driest since:
 1935
5th Wettest
Wettest since:
 1996
Apr–Dec 1964
9-Month 		26.39"
(670.31mm)		 20.67"
(525.02mm)		 5.72"
(145.29mm)		 119th Driest
Driest since:
 1976
10th Wettest
Wettest since:
 1996
Mar–Dec 1964
10-Month 		29.85"
(758.19mm)		 23.93"
(607.82mm)		 5.92"
(150.37mm)		 119th Driest
Driest since:
 1976
10th Wettest
Wettest since:
 1996
Feb–Dec 1964
11-Month 		31.10"
(789.94mm)		 27.54"
(699.52mm)		 3.56"
(90.42mm)		 102nd Driest
Driest since:
 1935
27th Wettest
Wettest since:
 1996
Jan–Dec 1964
12-Month 		37.85"
(961.39mm)		 32.07"
(814.58mm)		 5.78"
(146.81mm)		 117th Driest
Driest since:
 1929
12th Wettest
Wettest since:
 1996
Jul 1963–Dec 1964
18-Month 		52.12"
(1,323.85mm)		 46.58"
(1,183.13mm)		 5.54"
(140.72mm)		 108th Driest
Driest since:
 1929
20th Wettest
Wettest since:
 1996
Jan 1963–Dec 1964
24-Month 		69.96"
(1,776.98mm)		 64.19"
(1,630.43mm)		 5.77"
(146.55mm)		 109th Driest
Driest since:
 1930
19th Wettest
Wettest since:
 1996
Jan 1962–Dec 1964
36-Month 		100.71"
(2,558.03mm)		 96.33"
(2,446.78mm)		 4.38"
(111.25mm)		 99th Driest
Driest since:
 1930
28th Wettest
Wettest since:
 1997
Jan 1961–Dec 1964
48-Month 		135.65"
(3,445.51mm)		 128.33"
(3,259.58mm)		 7.32"
(185.93mm)		 103rd Driest
Driest since:
 1931
23rd Wettest
Wettest since:
 1998
Jan 1960–Dec 1964
60-Month 		167.85"
(4,263.39mm)		 160.34"
(4,072.64mm)		 7.51"
(190.75mm)		 103rd Driest
Driest since:
 1932
22nd Wettest
Wettest since:
 1999
Ties: 1958

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