National Rankings

National Data Info
Palmer Drought Severity Index (PDSI), Palmer Hydrological Drought Index (PHDI), and Palmer Modified Drought Index (PMDI) are not offered for multiple-month time scales.

Contiguous U.S.

Precipitation Rankings, December 1940

View Period (Months):
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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 1940
1-Month
2.84"
(72.14mm)
2.35"
(59.69mm)
0.49"
(12.45mm)
105th Driest
Driest since:
1930
24th Wettest
Wettest since:
2015
Ties: 2008
Nov–Dec 1940
2-Month
5.75"
(146.05mm)
4.58"
(116.33mm)
1.17"
(29.72mm)
117th Driest
Driest since:
1976
12th Wettest
Wettest since:
2015
Oct–Dec 1940
3-Month
7.52"
(191.01mm)
6.74"
(171.20mm)
0.78"
(19.81mm)
95th Driest
Driest since:
1917
34th Wettest
Wettest since:
2015
Ties: 1948, 1981
Sep–Dec 1940
4-Month
9.52"
(241.81mm)
9.23"
(234.44mm)
0.29"
(7.37mm)
74th Driest
Driest since:
1939
55th Wettest
Wettest since:
2018
Ties: 1929
Aug–Dec 1940
5-Month
12.49"
(317.25mm)
11.85"
(300.99mm)
0.64"
(16.26mm)
83rd Driest
Driest since:
1917
46th Wettest
Wettest since:
2018
Ties: 1991
Jul–Dec 1940
6-Month
14.99"
(380.75mm)
14.62"
(371.35mm)
0.37"
(9.40mm)
69th Driest
Driest since:
1917
60th Wettest
Wettest since:
2018
Jun–Dec 1940
7-Month
17.97"
(456.44mm)
17.55"
(445.77mm)
0.42"
(10.67mm)
69th Driest
Driest since:
1917
60th Wettest
Wettest since:
2018
May–Dec 1940
8-Month
20.19"
(512.83mm)
20.46"
(519.68mm)
-0.27"
(-6.85mm)
51st Driest
Driest since:
1917
78th Wettest
Wettest since:
2015
Apr–Dec 1940
9-Month
23.23"
(590.04mm)
22.98"
(583.69mm)
0.25"
(6.35mm)
63rd Driest
Driest since:
1956
66th Wettest
Wettest since:
2015
Mar–Dec 1940
10-Month
25.50"
(647.70mm)
25.49"
(647.45mm)
0.01"
(0.25mm)
59th Driest
Driest since:
1956
70th Wettest
Wettest since:
2015
Feb–Dec 1940
11-Month
28.48"
(723.39mm)
27.62"
(701.55mm)
0.86"
(21.84mm)
77th Driest
Driest since:
1910
52nd Wettest
Wettest since:
2018
Jan–Dec 1940
12-Month
30.41"
(772.41mm)
29.94"
(760.48mm)
0.47"
(11.93mm)
69th Driest
Driest since:
1910
60th Wettest
Wettest since:
1973
Jul 1939–Dec 1940
18-Month
41.57"
(1,055.88mm)
44.58"
(1,132.33mm)
-3.01"
(-76.45mm)
19th Driest
Driest since:
1954
109th Wettest
Wettest since:
2019
Jan 1939–Dec 1940
24-Month
56.74"
(1,441.20mm)
59.90"
(1,521.46mm)
-3.16"
(-80.26mm)
20th Driest
Driest since:
1931
108th Wettest
Wettest since:
2019
Jan 1938–Dec 1940
36-Month
86.48"
(2,196.59mm)
89.86"
(2,282.44mm)
-3.38"
(-85.85mm)
26th Driest
Driest since:
1956
101st Wettest
Wettest since:
2019
Jan 1937–Dec 1940
48-Month
116.99"
(2,971.55mm)
119.78"
(3,042.41mm)
-2.79"
(-70.86mm)
37th Driest
Driest since:
1956
89th Wettest
Wettest since:
2019
Jan 1936–Dec 1940
60-Month
144.27"
(3,664.46mm)
149.68"
(3,801.87mm)
-5.41"
(-137.41mm)
18th Driest
Driest since:
1956
107th Wettest
Wettest since:
2019

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