Climate at a Glance

Statewide Rankings

Look up monthly rankings for 1-12, 18, 24, 36, 48, and 60-month time periods using the options below. Data and statistics are as of August 2022. For more information, please see Climatological Rankings.


Iowa

Precipitation Rankings, September 2021

View Period (Months):All1234567891011121824364860
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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
September 2021
1-Month
1.83"
(46.48mm)
3.67"
(93.22mm)
-1.84"
(-46.74mm)
18th Driest Driest since: 2012 1939
110th Wettest Wettest since: 2020 1965
Aug–Sep 2021
2-Month
6.52"
(165.61mm)
7.51"
(190.75mm)
-0.99"
(-25.14mm)
50th Driest Driest since: 2020 1976
78th Wettest Wettest since: 2019 2018
Jul–Sep 2021
3-Month
10.55"
(267.97mm)
11.36"
(288.54mm)
-0.81"
(-20.57mm)
52nd Driest Driest since: 2020 2013
76th Wettest Wettest since: 2019 1993
Ties: 1956
Jun–Sep 2021
4-Month
13.92"
(353.57mm)
16.00"
(406.40mm)
-2.08"
(-52.83mm)
37th Driest Driest since: 2020 2012
91st Wettest Wettest since: 2019 1993
May–Sep 2021
5-Month
17.79"
(451.87mm)
20.04"
(509.02mm)
-2.25"
(-57.15mm)
39th Driest Driest since: 2020 1976
89th Wettest Wettest since: 2019 1993
Apr–Sep 2021
6-Month
19.32"
(490.73mm)
22.99"
(583.95mm)
-3.67"
(-93.22mm)
21st Driest Driest since: 2012 1988
107th Wettest Wettest since: 2020 1993
Mar–Sep 2021
7-Month
22.16"
(562.86mm)
24.94"
(633.48mm)
-2.78"
(-70.62mm)
34th Driest Driest since: 2012 1988
94th Wettest Wettest since: 2020 1993
Feb–Sep 2021
8-Month
22.95"
(582.93mm)
25.96"
(659.38mm)
-3.01"
(-76.45mm)
29th Driest Driest since: 2020 1988
99th Wettest Wettest since: 2019 1993
Jan–Sep 2021
9-Month
24.21"
(614.93mm)
26.93"
(684.02mm)
-2.72"
(-69.09mm)
33rd Driest Driest since: 2020 1988
95th Wettest Wettest since: 2019 1993
Dec 2020–Sep 2021
10-Month
25.35"
(643.89mm)
28.04"
(712.22mm)
-2.69"
(-68.33mm)
34th Driest Driest since: 2012 1988
93rd Wettest Wettest since: 2020 1993
Nov 2020–Sep 2021
11-Month
27.44"
(696.98mm)
29.78"
(756.41mm)
-2.34"
(-59.43mm)
40th Driest Driest since: 2020 1934
87th Wettest Wettest since: 2019 1993
Oct 2020–Sep 2021
12-Month
29.34"
(745.24mm)
32.09"
(815.09mm)
-2.75"
(-69.85mm)
37th Driest Driest since: 2012 1934
90th Wettest Wettest since: 2020 1993
Apr 2020–Sep 2021
18-Month
48.74"
(1,238.00mm)
55.13"
(1,400.30mm)
-6.39"
(-162.30mm)
19th Driest Driest since: 2012 1934
108th Wettest Wettest since: 2020 1993
Oct 2019–Sep 2021
24-Month
61.04"
(1,550.42mm)
64.26"
(1,632.20mm)
-3.22"
(-81.78mm)
40th Driest Driest since: 2013 1956
86th Wettest Wettest since: 2020 1993
Oct 2018–Sep 2021
36-Month
103.66"
(2,632.96mm)
96.36"
(2,447.54mm)
7.30"
(185.42mm)
95th Driest Driest since: 2014 1957
30th Wettest Wettest since: 2020 2010
Oct 2017–Sep 2021
48-Month
146.26"
(3,715.00mm)
128.36"
(3,260.34mm)
17.90"
(454.66mm)
111th Driest Driest since: 2015 1958
13th Wettest Wettest since: 2020 2010
Oct 2016–Sep 2021
60-Month
177.48"
(4,507.99mm)
160.34"
(4,072.64mm)
17.14"
(435.35mm)
104th Driest Driest since: 2015 1957
19th Wettest Wettest since: 2020 2010

Citing This Page

  • NOAA National Centers for Environmental information, Climate at a Glance: Statewide Time Series, Precipitation, published September 2022, retrieved on October 6, 2022 from https://www.ncdc.noaa.gov/cag/