Statewide Rankings

Statewide Data Info
Please note, Degree Days and Palmer Indices are not available for Alaska. Palmer Drought Severity Index (PDSI), Palmer Hydrological Drought Index (PHDI), and Palmer Modified Drought Index (PMDI) are not offered for multiple-month time scales.

Iowa

Precipitation Rankings, December 1939

View Period (Months):
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  • Record Driest
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  • Record Wettest
Period Value 1901-2000
Mean
Anomaly Rank
(1895-2021)
Wettest/Driest
Since
Record
December 1939
1-Month
0.60"
(15.24mm)
1.11"
(28.19mm)
-0.51"
(-12.95mm)
27th Driest
Driest since:
2002
101st Wettest
Wettest since:
2015
Nov–Dec 1939
2-Month
1.09"
(27.69mm)
2.87"
(72.90mm)
-1.78"
(-45.21mm)
11th Driest
Driest since:
1976
117th Wettest
Wettest since:
2015
Oct–Dec 1939
3-Month
2.57"
(65.28mm)
5.16"
(131.06mm)
-2.59"
(-65.78mm)
8th Driest
Driest since:
1910
120th Wettest
Wettest since:
1931
Sep–Dec 1939
4-Month
3.41"
(86.61mm)
8.83"
(224.28mm)
-5.42"
(-137.67mm)
1st Driest
Driest since:
1939, 1976
127th Wettest
Wettest since:
1931
Ties: 1976
Aug–Dec 1939
5-Month
8.08"
(205.23mm)
12.67"
(321.82mm)
-4.59"
(-116.59mm)
9th Driest
Driest since:
1976
119th Wettest
Wettest since:
2018
Jul–Dec 1939
6-Month
11.28"
(286.51mm)
16.52"
(419.61mm)
-5.24"
(-133.10mm)
11th Driest
Driest since:
1976
117th Wettest
Wettest since:
2018
Jun–Dec 1939
7-Month
16.20"
(411.48mm)
21.15"
(537.21mm)
-4.95"
(-125.73mm)
13th Driest
Driest since:
1976
115th Wettest
Wettest since:
2018
May–Dec 1939
8-Month
18.24"
(463.30mm)
25.20"
(640.08mm)
-6.96"
(-176.78mm)
8th Driest
Driest since:
1976
120th Wettest
Wettest since:
1993
Apr–Dec 1939
9-Month
20.24"
(514.10mm)
28.15"
(715.01mm)
-7.91"
(-200.91mm)
7th Driest
Driest since:
1910
121st Wettest
Wettest since:
1993
Mar–Dec 1939
10-Month
21.87"
(555.50mm)
30.10"
(764.54mm)
-8.23"
(-209.04mm)
4th Driest
Driest since:
1910
124th Wettest
Wettest since:
1993
Feb–Dec 1939
11-Month
23.64"
(600.46mm)
31.12"
(790.45mm)
-7.48"
(-189.99mm)
6th Driest
Driest since:
1910
122nd Wettest
Wettest since:
1993
Jan–Dec 1939
12-Month
24.50"
(622.30mm)
32.09"
(815.09mm)
-7.59"
(-192.79mm)
6th Driest
Driest since:
1910
122nd Wettest
Wettest since:
1993
Ties: 1901, 1933
Jul 1938–Dec 1939
18-Month
42.76"
(1,086.10mm)
48.69"
(1,236.73mm)
-5.93"
(-150.63mm)
24th Driest
Driest since:
1956
103rd Wettest
Wettest since:
1993
Jan 1938–Dec 1939
24-Month
60.82"
(1,544.83mm)
64.24"
(1,631.70mm)
-3.42"
(-86.87mm)
41st Driest
Driest since:
1989
86th Wettest
Wettest since:
2019
Jan 1937–Dec 1939
36-Month
88.32"
(2,243.33mm)
96.36"
(2,447.54mm)
-8.04"
(-204.21mm)
16th Driest
Driest since:
1957
110th Wettest
Wettest since:
2010
Jan 1936–Dec 1939
48-Month
113.86"
(2,892.04mm)
128.37"
(3,260.60mm)
-14.51"
(-368.56mm)
8th Driest
Driest since:
1958
117th Wettest
Wettest since:
2010
Jan 1935–Dec 1939
60-Month
146.39"
(3,718.31mm)
160.36"
(4,073.14mm)
-13.97"
(-354.83mm)
12th Driest
Driest since:
1956
112th Wettest
Wettest since:
2010

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