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 1946

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Period Value 1901-2000
Mean		 Anomaly Rank
(1895-2022)		 Wettest/Driest
Since		 Record
December 1946
1-Month 		4.17"
(105.92mm)		 4.63"
(117.60mm)		 -0.46"
(-11.68mm)		 54th Driest
Driest since:
 1976
75th Wettest
Wettest since:
 1964
Nov–Dec 1946
2-Month 		9.69"
(246.13mm)		 8.97"
(227.84mm)		 0.72"
(18.29mm)		 76th Driest
Driest since:
 1976
53rd Wettest
Wettest since:
 1996
Ties: 1982
Oct–Dec 1946
3-Month 		13.43"
(341.12mm)		 11.51"
(292.35mm)		 1.92"
(48.77mm)		 90th Driest
Driest since:
 1976
39th Wettest
Wettest since:
 1996
Sep–Dec 1946
4-Month 		14.79"
(375.67mm)		 12.93"
(328.42mm)		 1.86"
(47.25mm)		 88th Driest
Driest since:
 1976
41st Wettest
Wettest since:
 1996
Aug–Dec 1946
5-Month 		15.37"
(390.40mm)		 13.73"
(348.74mm)		 1.64"
(41.66mm)		 86th Driest
Driest since:
 1936
43rd Wettest
Wettest since:
 1996
Jul–Dec 1946
6-Month 		16.05"
(407.67mm)		 14.46"
(367.28mm)		 1.59"
(40.39mm)		 88th Driest
Driest since:
 1936
41st Wettest
Wettest since:
 1996
Jun–Dec 1946
7-Month 		17.98"
(456.69mm)		 16.18"
(410.97mm)		 1.80"
(45.72mm)		 92nd Driest
Driest since:
 1976
37th Wettest
Wettest since:
 1996
May–Dec 1946
8-Month 		19.67"
(499.62mm)		 18.32"
(465.33mm)		 1.35"
(34.29mm)		 86th Driest
Driest since:
 1935
43rd Wettest
Wettest since:
 1996
Apr–Dec 1946
9-Month 		21.27"
(540.26mm)		 20.67"
(525.02mm)		 0.60"
(15.24mm)		 74th Driest
Driest since:
 1976
55th Wettest
Wettest since:
 1996
Mar–Dec 1946
10-Month 		25.09"
(637.29mm)		 23.93"
(607.82mm)		 1.16"
(29.47mm)		 79th Driest
Driest since:
 1976
50th Wettest
Wettest since:
 1996
Feb–Dec 1946
11-Month 		28.74"
(730.00mm)		 27.54"
(699.52mm)		 1.20"
(30.48mm)		 75th Driest
Driest since:
 1935
54th Wettest
Wettest since:
 1996
Jan–Dec 1946
12-Month 		33.23"
(844.04mm)		 32.07"
(814.58mm)		 1.16"
(29.46mm)		 80th Driest
Driest since:
 1929
49th Wettest
Wettest since:
 1996
Jul 1945–Dec 1946
18-Month 		49.94"
(1,268.48mm)		 46.58"
(1,183.13mm)		 3.36"
(85.35mm)		 97th Driest
Driest since:
 1929
31st Wettest
Wettest since:
 1996
Jan 1945–Dec 1946
24-Month 		69.66"
(1,769.36mm)		 64.19"
(1,630.43mm)		 5.47"
(138.93mm)		 108th Driest
Driest since:
 1930
20th Wettest
Wettest since:
 1996
Jan 1944–Dec 1946
36-Month 		94.44"
(2,398.78mm)		 96.33"
(2,446.78mm)		 -1.89"
(-48.00mm)		 50th Driest
Driest since:
 1930
77th Wettest
Wettest since:
 1997
Jan 1943–Dec 1946
48-Month 		121.68"
(3,090.67mm)		 128.33"
(3,259.58mm)		 -6.65"
(-168.91mm)		 30th Driest
Driest since:
 1931
96th Wettest
Wettest since:
 1998
Jan 1942–Dec 1946
60-Month 		155.47"
(3,948.94mm)		 160.34"
(4,072.64mm)		 -4.87"
(-123.70mm)		 39th Driest
Driest since:
 1932
86th Wettest
Wettest since:
 1999

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