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 1966

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 1966
1-Month
1.43"
(36.32mm)
3.67"
(93.22mm)
-2.24"
(-56.90mm)
8th Driest
Driest since:
1939
121st Wettest
Wettest since:
1965
Aug–Sep 1966
2-Month
3.94"
(100.08mm)
7.51"
(190.75mm)
-3.57"
(-90.67mm)
7th Driest
Driest since:
1976
122nd Wettest
Wettest since:
2018
Jul–Sep 1966
3-Month
7.22"
(183.39mm)
11.36"
(288.54mm)
-4.14"
(-105.15mm)
10th Driest
Driest since:
2013
119th Wettest
Wettest since:
1993
Jun–Sep 1966
4-Month
12.85"
(326.39mm)
16.00"
(406.40mm)
-3.15"
(-80.01mm)
24th Driest
Driest since:
2012
105th Wettest
Wettest since:
1993
May–Sep 1966
5-Month
16.72"
(424.69mm)
20.04"
(509.02mm)
-3.32"
(-84.33mm)
23rd Driest
Driest since:
1976
106th Wettest
Wettest since:
1993
Apr–Sep 1966
6-Month
18.65"
(473.71mm)
22.99"
(583.95mm)
-4.34"
(-110.24mm)
18th Driest
Driest since:
1988
111th Wettest
Wettest since:
1993
Mar–Sep 1966
7-Month
20.48"
(520.19mm)
24.94"
(633.48mm)
-4.46"
(-113.29mm)
16th Driest
Driest since:
1988
113th Wettest
Wettest since:
1993
Feb–Sep 1966
8-Month
21.20"
(538.48mm)
25.96"
(659.38mm)
-4.76"
(-120.90mm)
14th Driest
Driest since:
1988
115th Wettest
Wettest since:
1993
Jan–Sep 1966
9-Month
22.16"
(562.86mm)
26.93"
(684.02mm)
-4.77"
(-121.16mm)
15th Driest
Driest since:
1988
114th Wettest
Wettest since:
1993
Dec 1965–Sep 1966
10-Month
23.84"
(605.54mm)
28.04"
(712.22mm)
-4.20"
(-106.68mm)
21st Driest
Driest since:
1988
107th Wettest
Wettest since:
1993
Nov 1965–Sep 1966
11-Month
25.14"
(638.56mm)
29.78"
(756.41mm)
-4.64"
(-117.85mm)
13th Driest
Driest since:
1934
115th Wettest
Wettest since:
1993
Oct 1965–Sep 1966
12-Month
26.20"
(665.48mm)
32.09"
(815.09mm)
-5.89"
(-149.61mm)
11th Driest
Driest since:
1934
117th Wettest
Wettest since:
1993
Ties: 1976, 1989
Apr 1965–Sep 1966
18-Month
56.93"
(1,446.02mm)
55.13"
(1,400.30mm)
1.80"
(45.72mm)
75th Driest
Driest since:
1934
53rd Wettest
Wettest since:
1993
Oct 1964–Sep 1966
24-Month
64.83"
(1,646.68mm)
64.26"
(1,632.20mm)
0.57"
(14.48mm)
67th Driest
Driest since:
1956
60th Wettest
Wettest since:
1993
Oct 1963–Sep 1966
36-Month
96.58"
(2,453.13mm)
96.36"
(2,447.54mm)
0.22"
(5.59mm)
61st Driest
Driest since:
1957
65th Wettest
Wettest since:
2010
Oct 1962–Sep 1966
48-Month
124.55"
(3,163.57mm)
128.36"
(3,260.34mm)
-3.81"
(-96.77mm)
39th Driest
Driest since:
1958
86th Wettest
Wettest since:
2010
Oct 1961–Sep 1966
60-Month
159.31"
(4,046.47mm)
160.34"
(4,072.64mm)
-1.03"
(-26.17mm)
55th Driest
Driest since:
1957
69th Wettest
Wettest since:
2010

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