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, December 2015

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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
December 2015
1-Month 		4.71"
(119.63mm)		 1.11"
(28.19mm)		 3.60"
(91.44mm)		 128th Driest
Driest since:
 2002
1st Wettest
Wettest to Date
 2015
Nov–Dec 2015
2-Month 		8.79"
(223.27mm)		 2.87"
(72.90mm)		 5.92"
(150.37mm)		 128th Driest
Driest since:
 1976
1st Wettest
Wettest to Date
 2015
Oct–Dec 2015
3-Month 		10.55"
(267.97mm)		 5.16"
(131.06mm)		 5.39"
(136.91mm)		 127th Driest
Driest since:
 1910
2nd Wettest
Wettest since:
 1931
Sep–Dec 2015
4-Month 		14.73"
(374.14mm)		 8.83"
(224.28mm)		 5.90"
(149.86mm)		 125th Driest
Driest since:
 1939, 1976
4th Wettest
Wettest since:
 1931
Aug–Dec 2015
5-Month 		20.02"
(508.51mm)		 12.67"
(321.82mm)		 7.35"
(186.69mm)		 125th Driest
Driest since:
 1976
4th Wettest
Wettest since:
 2018
Jul–Dec 2015
6-Month 		25.53"
(648.46mm)		 16.52"
(419.61mm)		 9.01"
(228.85mm)		 125th Driest
Driest since:
 1976
4th Wettest
Wettest since:
 2018
Jun–Dec 2015
7-Month 		31.91"
(810.51mm)		 21.15"
(537.21mm)		 10.76"
(273.30mm)		 124th Driest
Driest since:
 1976
5th Wettest
Wettest since:
 2018
May–Dec 2015
8-Month 		36.97"
(939.04mm)		 25.20"
(640.08mm)		 11.77"
(298.96mm)		 125th Driest
Driest since:
 1976
4th Wettest
Wettest since:
 1993
Apr–Dec 2015
9-Month 		40.34"
(1,024.64mm)		 28.15"
(715.01mm)		 12.19"
(309.63mm)		 126th Driest
Driest since:
 1910
3rd Wettest
Wettest since:
 1993
Mar–Dec 2015
10-Month 		40.90"
(1,038.86mm)		 30.10"
(764.54mm)		 10.80"
(274.32mm)		 124th Driest
Driest since:
 1910
5th Wettest
Wettest since:
 1993
Feb–Dec 2015
11-Month 		42.01"
(1,067.05mm)		 31.12"
(790.45mm)		 10.89"
(276.60mm)		 123rd Driest
Driest since:
 1910
6th Wettest
Wettest since:
 1993
Jan–Dec 2015
12-Month 		42.53"
(1,080.26mm)		 32.09"
(815.09mm)		 10.44"
(265.17mm)		 122nd Driest
Driest since:
 1910
7th Wettest
Wettest since:
 1993
Jul 2014–Dec 2015
18-Month 		61.13"
(1,552.70mm)		 48.69"
(1,236.73mm)		 12.44"
(315.97mm)		 120th Driest
Driest since:
 1956
8th Wettest
Wettest since:
 1993
Jan 2014–Dec 2015
24-Month 		81.22"
(2,062.99mm)		 64.24"
(1,631.70mm)		 16.98"
(431.29mm)		 122nd Driest
Driest since:
 1989
6th Wettest
Wettest since:
 2019
Jan 2013–Dec 2015
36-Month 		115.66"
(2,937.76mm)		 96.36"
(2,447.54mm)		 19.30"
(490.22mm)		 119th Driest
Driest since:
 1957
8th Wettest
Wettest since:
 2010
Jan 2012–Dec 2015
48-Month 		141.27"
(3,588.26mm)		 128.37"
(3,260.60mm)		 12.90"
(327.66mm)		 104th Driest
Driest since:
 1958
22nd Wettest
Wettest since:
 2010
Jan 2011–Dec 2015
60-Month 		173.10"
(4,396.74mm)		 160.36"
(4,073.14mm)		 12.74"
(323.60mm)		 97th Driest
Driest since:
 1956
28th Wettest
Wettest since:
 2010

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