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, September 1951

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
September 1951
1-Month
2.47"
(62.74mm)
3.67"
(93.22mm)
-1.20"
(-30.48mm)
41st Driest
Driest since:
1939
88th Wettest
Wettest since:
1965
Ties: 1963
Aug–Sep 1951
2-Month
8.64"
(219.46mm)
7.51"
(190.75mm)
1.13"
(28.71mm)
91st Driest
Driest since:
1976
38th Wettest
Wettest since:
2018
Jul–Sep 1951
3-Month
13.17"
(334.52mm)
11.36"
(288.54mm)
1.81"
(45.98mm)
97th Driest
Driest since:
2013
32nd Wettest
Wettest since:
1993
Jun–Sep 1951
4-Month
19.36"
(491.74mm)
16.00"
(406.40mm)
3.36"
(85.34mm)
111th Driest
Driest since:
2012
18th Wettest
Wettest since:
1993
May–Sep 1951
5-Month
24.34"
(618.24mm)
20.04"
(509.02mm)
4.30"
(109.22mm)
111th Driest
Driest since:
1976
18th Wettest
Wettest since:
1993
Apr–Sep 1951
6-Month
29.23"
(742.44mm)
22.99"
(583.95mm)
6.24"
(158.49mm)
115th Driest
Driest since:
1988
14th Wettest
Wettest since:
1993
Mar–Sep 1951
7-Month
33.41"
(848.61mm)
24.94"
(633.48mm)
8.47"
(215.13mm)
122nd Driest
Driest since:
1988
7th Wettest
Wettest since:
1993
Feb–Sep 1951
8-Month
35.83"
(910.08mm)
25.96"
(659.38mm)
9.87"
(250.70mm)
125th Driest
Driest since:
1988
4th Wettest
Wettest since:
1993
Jan–Sep 1951
9-Month
36.44"
(925.58mm)
26.93"
(684.02mm)
9.51"
(241.56mm)
124th Driest
Driest since:
1988
5th Wettest
Wettest since:
1993
Dec 1950–Sep 1951
10-Month
37.19"
(944.63mm)
28.04"
(712.22mm)
9.15"
(232.41mm)
121st Driest
Driest since:
1988
7th Wettest
Wettest since:
1993
Nov 1950–Sep 1951
11-Month
37.76"
(959.10mm)
29.78"
(756.41mm)
7.98"
(202.69mm)
118th Driest
Driest since:
1934
10th Wettest
Wettest since:
1993
Oct 1950–Sep 1951
12-Month
39.02"
(991.11mm)
32.09"
(815.09mm)
6.93"
(176.02mm)
115th Driest
Driest since:
1934
13th Wettest
Wettest since:
1993
Apr 1950–Sep 1951
18-Month
61.40"
(1,559.56mm)
55.13"
(1,400.30mm)
6.27"
(159.26mm)
103rd Driest
Driest since:
1934
25th Wettest
Wettest since:
1993
Oct 1949–Sep 1951
24-Month
68.97"
(1,751.84mm)
64.26"
(1,632.20mm)
4.71"
(119.64mm)
92nd Driest
Driest since:
1956
35th Wettest
Wettest since:
1993
Oct 1948–Sep 1951
36-Month
99.94"
(2,538.48mm)
96.36"
(2,447.54mm)
3.58"
(90.94mm)
82nd Driest
Driest since:
1957
44th Wettest
Wettest since:
2010
Oct 1947–Sep 1951
48-Month
129.21"
(3,281.93mm)
128.36"
(3,260.34mm)
0.85"
(21.59mm)
61st Driest
Driest since:
1958
64th Wettest
Wettest since:
2010
Oct 1946–Sep 1951
60-Month
162.24"
(4,120.90mm)
160.34"
(4,072.64mm)
1.90"
(48.26mm)
66th Driest
Driest since:
1957
58th Wettest
Wettest since:
2010

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