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 1929

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Period Value 1901-2000
Mean
Anomaly Rank
(1895-2022)
Wettest/Driest
Since
Record
December 1929
1-Month
6.43"
(163.32mm)
4.63"
(117.60mm)
1.80"
(45.72mm)
117th Driest
Driest since:
1976
12th Wettest
Wettest since:
1964
Nov–Dec 1929
2-Month
6.89"
(175.01mm)
8.97"
(227.84mm)
-2.08"
(-52.83mm)
28th Driest
Driest since:
1976
101st Wettest
Wettest since:
1996
Oct–Dec 1929
3-Month
8.01"
(203.45mm)
11.51"
(292.35mm)
-3.50"
(-88.90mm)
15th Driest
Driest since:
1976
114th Wettest
Wettest since:
1996
Sep–Dec 1929
4-Month
8.48"
(215.39mm)
12.93"
(328.42mm)
-4.45"
(-113.03mm)
9th Driest
Driest to Date
1976
120th Wettest
Wettest since:
1996
Aug–Dec 1929
5-Month
8.83"
(224.28mm)
13.73"
(348.74mm)
-4.90"
(-124.46mm)
7th Driest
Driest to Date
1936
122nd Wettest
Wettest since:
1996
Jul–Dec 1929
6-Month
8.97"
(227.84mm)
14.46"
(367.28mm)
-5.49"
(-139.44mm)
5th Driest
Driest to Date
1936
124th Wettest
Wettest since:
1996
Ties: 1930
Jun–Dec 1929
7-Month
11.13"
(282.70mm)
16.18"
(410.97mm)
-5.05"
(-128.27mm)
7th Driest
Driest to Date
1976
122nd Wettest
Wettest since:
1996
May–Dec 1929
8-Month
12.17"
(309.12mm)
18.32"
(465.33mm)
-6.15"
(-156.21mm)
4th Driest
Driest since:
1935
125th Wettest
Wettest since:
1996
Ties: 1928
Apr–Dec 1929
9-Month
15.03"
(381.76mm)
20.67"
(525.02mm)
-5.64"
(-143.26mm)
8th Driest
Driest since:
1976
121st Wettest
Wettest since:
1996
Mar–Dec 1929
10-Month
17.65"
(448.31mm)
23.93"
(607.82mm)
-6.28"
(-159.51mm)
7th Driest
Driest to Date
1976
122nd Wettest
Wettest since:
1996
Feb–Dec 1929
11-Month
18.98"
(482.09mm)
27.54"
(699.52mm)
-8.56"
(-217.43mm)
2nd Driest
Driest to Date
1935
127th Wettest
Wettest since:
1996
Jan–Dec 1929
12-Month
22.36"
(567.94mm)
32.07"
(814.58mm)
-9.71"
(-246.64mm)
1st Driest
Driest to Date
1929
128th Wettest
Wettest since:
1996
Jul 1928–Dec 1929
18-Month
32.64"
(829.06mm)
46.58"
(1,183.13mm)
-13.94"
(-354.07mm)
1st Driest
Driest to Date
1929
127th Wettest
Wettest since:
1996
Jan 1928–Dec 1929
24-Month
47.91"
(1,216.91mm)
64.19"
(1,630.43mm)
-16.28"
(-413.52mm)
2nd Driest
Driest to Date
1930
126th Wettest
Wettest since:
1996
Jan 1927–Dec 1929
36-Month
84.55"
(2,147.57mm)
96.33"
(2,446.78mm)
-11.78"
(-299.21mm)
7th Driest
Driest to Date
1930
120th Wettest
Wettest since:
1997
Jan 1926–Dec 1929
48-Month
114.86"
(2,917.44mm)
128.33"
(3,259.58mm)
-13.47"
(-342.14mm)
8th Driest
Driest since:
1931
118th Wettest
Wettest since:
1998
Jan 1925–Dec 1929
60-Month
144.60"
(3,672.84mm)
160.34"
(4,072.64mm)
-15.74"
(-399.80mm)
8th Driest
Driest to Date
1932
117th Wettest
Wettest since:
1999

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