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 1940

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 1940
1-Month
1.36"
(34.54mm)
1.11"
(28.19mm)
0.25"
(6.35mm)
86th Driest
Driest since:
2002
42nd Wettest
Wettest since:
2015
Ties: 1925
Nov–Dec 1940
2-Month
3.87"
(98.30mm)
2.87"
(72.90mm)
1.00"
(25.40mm)
102nd Driest
Driest since:
1976
26th Wettest
Wettest since:
2015
Oct–Dec 1940
3-Month
6.19"
(157.23mm)
5.16"
(131.06mm)
1.03"
(26.17mm)
90th Driest
Driest since:
1910
38th Wettest
Wettest since:
1931
Sep–Dec 1940
4-Month
7.06"
(179.32mm)
8.83"
(224.28mm)
-1.77"
(-44.96mm)
38th Driest
Driest since:
1939, 1976
90th Wettest
Wettest since:
1931
Ties: 1995
Aug–Dec 1940
5-Month
13.48"
(342.39mm)
12.67"
(321.82mm)
0.81"
(20.57mm)
77th Driest
Driest since:
1976
51st Wettest
Wettest since:
2018
Jul–Dec 1940
6-Month
18.05"
(458.47mm)
16.52"
(419.61mm)
1.53"
(38.86mm)
85th Driest
Driest since:
1976
43rd Wettest
Wettest since:
2018
Jun–Dec 1940
7-Month
21.72"
(551.69mm)
21.15"
(537.21mm)
0.57"
(14.48mm)
71st Driest
Driest since:
1976
57th Wettest
Wettest since:
2018
May–Dec 1940
8-Month
23.74"
(603.00mm)
25.20"
(640.08mm)
-1.46"
(-37.08mm)
51st Driest
Driest since:
1976
77th Wettest
Wettest since:
1993
Apr–Dec 1940
9-Month
26.89"
(683.01mm)
28.15"
(715.01mm)
-1.26"
(-32.00mm)
51st Driest
Driest since:
1910
77th Wettest
Wettest since:
1993
Mar–Dec 1940
10-Month
28.59"
(726.19mm)
30.10"
(764.54mm)
-1.51"
(-38.35mm)
50th Driest
Driest since:
1910
78th Wettest
Wettest since:
1993
Feb–Dec 1940
11-Month
29.70"
(754.38mm)
31.12"
(790.45mm)
-1.42"
(-36.07mm)
49th Driest
Driest since:
1910
79th Wettest
Wettest since:
1993
Jan–Dec 1940
12-Month
30.51"
(774.95mm)
32.09"
(815.09mm)
-1.58"
(-40.14mm)
48th Driest
Driest since:
1910
80th Wettest
Wettest since:
1993
Jul 1939–Dec 1940
18-Month
41.79"
(1,061.47mm)
48.69"
(1,236.73mm)
-6.90"
(-175.26mm)
17th Driest
Driest since:
1956
110th Wettest
Wettest since:
1993
Jan 1939–Dec 1940
24-Month
55.01"
(1,397.25mm)
64.24"
(1,631.70mm)
-9.23"
(-234.45mm)
8th Driest
Driest since:
1989
119th Wettest
Wettest since:
2019
Jan 1938–Dec 1940
36-Month
91.33"
(2,319.78mm)
96.36"
(2,447.54mm)
-5.03"
(-127.76mm)
36th Driest
Driest since:
1957
90th Wettest
Wettest since:
2010
Jan 1937–Dec 1940
48-Month
118.83"
(3,018.28mm)
128.37"
(3,260.60mm)
-9.54"
(-242.32mm)
15th Driest
Driest since:
1958
110th Wettest
Wettest since:
2010
Jan 1936–Dec 1940
60-Month
144.37"
(3,667.00mm)
160.36"
(4,073.14mm)
-15.99"
(-406.14mm)
9th Driest
Driest since:
1956
115th Wettest
Wettest since:
2010

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