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 2017

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  • Record Wettest
PeriodValue1901-2000
Mean		AnomalyRank
(1895-2022)		Wettest/Driest
Since		Record
December 2017
1-Month		3.00"
(76.20mm)		4.63"
(117.60mm)		-1.63"
(-41.40mm)		21st Driest
Driest since:
1976
108th Wettest
Wettest since:
1964
Nov–Dec 2017
2-Month		8.61"
(218.69mm)		8.97"
(227.84mm)		-0.36"
(-9.15mm)		59th Driest
Driest since:
1976
70th Wettest
Wettest since:
1996
Oct–Dec 2017
3-Month		11.76"
(298.70mm)		11.51"
(292.35mm)		0.25"
(6.35mm)		66th Driest
Driest since:
1976
63rd Wettest
Wettest since:
1996
Sep–Dec 2017
4-Month		13.37"
(339.60mm)		12.93"
(328.42mm)		0.44"
(11.18mm)		69th Driest
Driest since:
1976
60th Wettest
Wettest since:
1996
Aug–Dec 2017
5-Month		13.61"
(345.69mm)		13.73"
(348.74mm)		-0.12"
(-3.05mm)		65th Driest
Driest since:
1936
64th Wettest
Wettest since:
1996
Jul–Dec 2017
6-Month		13.76"
(349.50mm)		14.46"
(367.28mm)		-0.70"
(-17.78mm)		58th Driest
Driest since:
1936
71st Wettest
Wettest since:
1996
Jun–Dec 2017
7-Month		15.29"
(388.37mm)		16.18"
(410.97mm)		-0.89"
(-22.60mm)		58th Driest
Driest since:
1976
71st Wettest
Wettest since:
1996
May–Dec 2017
8-Month		17.11"
(434.59mm)		18.32"
(465.33mm)		-1.21"
(-30.74mm)		49th Driest
Driest since:
1935
80th Wettest
Wettest since:
1996
Apr–Dec 2017
9-Month		20.95"
(532.13mm)		20.67"
(525.02mm)		0.28"
(7.11mm)		71st Driest
Driest since:
1976
58th Wettest
Wettest since:
1996
Ties: 1994
Mar–Dec 2017
10-Month		26.93"
(684.02mm)		23.93"
(607.82mm)		3.00"
(76.20mm)		100th Driest
Driest since:
1976
29th Wettest
Wettest since:
1996
Feb–Dec 2017
11-Month		33.07"
(839.98mm)		27.54"
(699.52mm)		5.53"
(140.46mm)		114th Driest
Driest since:
1935
15th Wettest
Wettest since:
1996
Jan–Dec 2017
12-Month		37.14"
(943.36mm)		32.07"
(814.58mm)		5.07"
(128.78mm)		114th Driest
Driest since:
1929
15th Wettest
Wettest since:
1996
Jul 2016–Dec 2017
18-Month		55.09"
(1,399.29mm)		46.58"
(1,183.13mm)		8.51"
(216.16mm)		121st Driest
Driest since:
1929
7th Wettest
Wettest since:
1996
Jan 2016–Dec 2017
24-Month		72.45"
(1,840.23mm)		64.19"
(1,630.43mm)		8.26"
(209.80mm)		116th Driest
Driest since:
1930
12th Wettest
Wettest since:
1996
Jan 2015–Dec 2017
36-Month		103.59"
(2,631.19mm)		96.33"
(2,446.78mm)		7.26"
(184.41mm)		110th Driest
Driest since:
1930
17th Wettest
Wettest since:
1997
Jan 2014–Dec 2017
48-Month		139.57"
(3,545.08mm)		128.33"
(3,259.58mm)		11.24"
(285.50mm)		114th Driest
Driest since:
1931
12th Wettest
Wettest since:
1998
Jan 2013–Dec 2017
60-Month		164.08"
(4,167.63mm)		160.34"
(4,072.64mm)		3.74"
(94.99mm)		85th Driest
Driest since:
1932
40th Wettest
Wettest since:
1999

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