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 2012

View Period (Months):
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  • Record Driest
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  • Top 1/3
  • Top 1/10
  • Record Wettest
Period Value 1901-2000
Mean
Anomaly Rank
(1895-2022)
Wettest/Driest
Since
Record
September 2012
1-Month
1.62"
(41.15mm)
3.67"
(93.22mm)
-2.05"
(-52.07mm)
14th Driest
Driest since:
1939
115th Wettest
Wettest since:
1965
Aug–Sep 2012
2-Month
4.50"
(114.30mm)
7.51"
(190.75mm)
-3.01"
(-76.45mm)
11th Driest
Driest since:
1976
118th Wettest
Wettest since:
2018
Ties: 1899
Jul–Sep 2012
3-Month
5.67"
(144.02mm)
11.36"
(288.54mm)
-5.69"
(-144.52mm)
4th Driest
Driest since:
2013
125th Wettest
Wettest since:
1993
Jun–Sep 2012
4-Month
8.48"
(215.39mm)
16.00"
(406.40mm)
-7.52"
(-191.01mm)
1st Driest
Driest since:
2012
128th Wettest
Wettest since:
1993
May–Sep 2012
5-Month
11.99"
(304.55mm)
20.04"
(509.02mm)
-8.05"
(-204.47mm)
2nd Driest
Driest since:
1976
127th Wettest
Wettest since:
1993
Apr–Sep 2012
6-Month
15.89"
(403.61mm)
22.99"
(583.95mm)
-7.10"
(-180.34mm)
2nd Driest
Driest since:
1988
127th Wettest
Wettest since:
1993
Mar–Sep 2012
7-Month
17.80"
(452.12mm)
24.94"
(633.48mm)
-7.14"
(-181.36mm)
4th Driest
Driest since:
1988
125th Wettest
Wettest since:
1993
Feb–Sep 2012
8-Month
19.48"
(494.79mm)
25.96"
(659.38mm)
-6.48"
(-164.59mm)
4th Driest
Driest since:
1988
125th Wettest
Wettest since:
1993
Jan–Sep 2012
9-Month
20.05"
(509.27mm)
26.93"
(684.02mm)
-6.88"
(-174.75mm)
4th Driest
Driest since:
1988
125th Wettest
Wettest since:
1993
Dec 2011–Sep 2012
10-Month
22.13"
(562.10mm)
28.04"
(712.22mm)
-5.91"
(-150.12mm)
9th Driest
Driest since:
1988
119th Wettest
Wettest since:
1993
Nov 2011–Sep 2012
11-Month
24.21"
(614.93mm)
29.78"
(756.41mm)
-5.57"
(-141.48mm)
9th Driest
Driest since:
1934
119th Wettest
Wettest since:
1993
Oct 2011–Sep 2012
12-Month
24.95"
(633.73mm)
32.09"
(815.09mm)
-7.14"
(-181.36mm)
4th Driest
Driest since:
1934
124th Wettest
Wettest since:
1993
Apr 2011–Sep 2012
18-Month
48.05"
(1,220.47mm)
55.13"
(1,400.30mm)
-7.08"
(-179.83mm)
15th Driest
Driest since:
1934
113th Wettest
Wettest since:
1993
Oct 2010–Sep 2012
24-Month
55.66"
(1,413.76mm)
64.26"
(1,632.20mm)
-8.60"
(-218.44mm)
10th Driest
Driest since:
1956
117th Wettest
Wettest since:
1993
Oct 2009–Sep 2012
36-Month
106.01"
(2,692.65mm)
96.36"
(2,447.54mm)
9.65"
(245.11mm)
102nd Driest
Driest since:
1957
24th Wettest
Wettest since:
2010
Oct 2008–Sep 2012
48-Month
141.94"
(3,605.28mm)
128.36"
(3,260.34mm)
13.58"
(344.94mm)
105th Driest
Driest since:
1958
20th Wettest
Wettest since:
2010
Oct 2007–Sep 2012
60-Month
185.72"
(4,717.29mm)
160.34"
(4,072.64mm)
25.38"
(644.65mm)
115th Driest
Driest since:
1957
9th Wettest
Wettest since:
2010

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