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 1918

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 1918
1-Month
1.84"
(46.74mm)
3.67"
(93.22mm)
-1.83"
(-46.48mm)
19th Driest
Driest since:
1939
110th Wettest
Wettest since:
1965
Ties: 1999
Aug–Sep 1918
2-Month
5.43"
(137.92mm)
7.51"
(190.75mm)
-2.08"
(-52.83mm)
25th Driest
Driest since:
1976
104th Wettest
Wettest since:
2018
Jul–Sep 1918
3-Month
8.74"
(222.00mm)
11.36"
(288.54mm)
-2.62"
(-66.54mm)
28th Driest
Driest since:
2013
101st Wettest
Wettest since:
1993
Jun–Sep 1918
4-Month
13.94"
(354.08mm)
16.00"
(406.40mm)
-2.06"
(-52.32mm)
39th Driest
Driest since:
2012
90th Wettest
Wettest since:
1993
May–Sep 1918
5-Month
20.79"
(528.07mm)
20.04"
(509.02mm)
0.75"
(19.05mm)
72nd Driest
Driest since:
1976
57th Wettest
Wettest since:
1993
Apr–Sep 1918
6-Month
23.09"
(586.49mm)
22.99"
(583.95mm)
0.10"
(2.54mm)
66th Driest
Driest since:
1988
63rd Wettest
Wettest since:
1993
Mar–Sep 1918
7-Month
23.74"
(603.00mm)
24.94"
(633.48mm)
-1.20"
(-30.48mm)
52nd Driest
Driest since:
1988
77th Wettest
Wettest since:
1993
Feb–Sep 1918
8-Month
24.70"
(627.38mm)
25.96"
(659.38mm)
-1.26"
(-32.00mm)
52nd Driest
Driest since:
1988
77th Wettest
Wettest since:
1993
Ties: 2005
Jan–Sep 1918
9-Month
25.68"
(652.27mm)
26.93"
(684.02mm)
-1.25"
(-31.75mm)
53rd Driest
Driest since:
1988
76th Wettest
Wettest since:
1993
Dec 1917–Sep 1918
10-Month
26.23"
(666.24mm)
28.04"
(712.22mm)
-1.81"
(-45.98mm)
45th Driest
Driest since:
1988
83rd Wettest
Wettest since:
1993
Nov 1917–Sep 1918
11-Month
26.50"
(673.10mm)
29.78"
(756.41mm)
-3.28"
(-83.31mm)
33rd Driest
Driest since:
1934
95th Wettest
Wettest since:
1993
Oct 1917–Sep 1918
12-Month
27.84"
(707.14mm)
32.09"
(815.09mm)
-4.25"
(-107.95mm)
25th Driest
Driest since:
1934
103rd Wettest
Wettest since:
1993
Apr 1917–Sep 1918
18-Month
50.30"
(1,277.62mm)
55.13"
(1,400.30mm)
-4.83"
(-122.68mm)
28th Driest
Driest since:
1934
100th Wettest
Wettest since:
1993
Oct 1916–Sep 1918
24-Month
57.99"
(1,472.95mm)
64.26"
(1,632.20mm)
-6.27"
(-159.25mm)
22nd Driest
Driest since:
1956
105th Wettest
Wettest since:
1993
Oct 1915–Sep 1918
36-Month
85.64"
(2,175.26mm)
96.36"
(2,447.54mm)
-10.72"
(-272.28mm)
11th Driest
Driest since:
1957
115th Wettest
Wettest since:
2010
Oct 1914–Sep 1918
48-Month
125.54"
(3,188.72mm)
128.36"
(3,260.34mm)
-2.82"
(-71.62mm)
46th Driest
Driest since:
1958
79th Wettest
Wettest since:
2010
Oct 1913–Sep 1918
60-Month
157.58"
(4,002.53mm)
160.34"
(4,072.64mm)
-2.76"
(-70.11mm)
43rd Driest
Driest since:
1957
81st Wettest
Wettest since:
2010

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