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 2018

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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 2018
1-Month 		2.10"
(53.34mm)		 1.11"
(28.19mm)		 0.99"
(25.15mm)		 120th Driest
Driest since:
 2002
9th Wettest
Wettest since:
 2015
Ties: 1984
Nov–Dec 2018
2-Month 		3.91"
(99.31mm)		 2.87"
(72.90mm)		 1.04"
(26.41mm)		 105th Driest
Driest since:
 1976
24th Wettest
Wettest since:
 2015
Ties: 1952
Oct–Dec 2018
3-Month 		8.54"
(216.92mm)		 5.16"
(131.06mm)		 3.38"
(85.86mm)		 118th Driest
Driest since:
 1910
11th Wettest
Wettest since:
 1931
Sep–Dec 2018
4-Month 		16.64"
(422.66mm)		 8.83"
(224.28mm)		 7.81"
(198.38mm)		 126th Driest
Driest since:
 1939, 1976
3rd Wettest
Wettest since:
 1931
Aug–Dec 2018
5-Month 		23.06"
(585.72mm)		 12.67"
(321.82mm)		 10.39"
(263.90mm)		 128th Driest
Driest since:
 1976
1st Wettest
Wettest to Date
 2018
Jul–Dec 2018
6-Month 		26.45"
(671.83mm)		 16.52"
(419.61mm)		 9.93"
(252.22mm)		 128th Driest
Driest since:
 1976
1st Wettest
Wettest to Date
 2018
Jun–Dec 2018
7-Month 		34.00"
(863.60mm)		 21.15"
(537.21mm)		 12.85"
(326.39mm)		 128th Driest
Driest since:
 1976
1st Wettest
Wettest to Date
 2018
May–Dec 2018
8-Month 		38.70"
(982.98mm)		 25.20"
(640.08mm)		 13.50"
(342.90mm)		 126th Driest
Driest since:
 1976
3rd Wettest
Wettest since:
 1993
Apr–Dec 2018
9-Month 		40.24"
(1,022.10mm)		 28.15"
(715.01mm)		 12.09"
(307.09mm)		 125th Driest
Driest since:
 1910
4th Wettest
Wettest since:
 1993
Mar–Dec 2018
10-Month 		42.52"
(1,080.01mm)		 30.10"
(764.54mm)		 12.42"
(315.47mm)		 127th Driest
Driest since:
 1910
2nd Wettest
Wettest since:
 1993
Feb–Dec 2018
11-Month 		44.06"
(1,119.12mm)		 31.12"
(790.45mm)		 12.94"
(328.67mm)		 127th Driest
Driest since:
 1910
2nd Wettest
Wettest since:
 1993
Jan–Dec 2018
12-Month 		45.08"
(1,145.03mm)		 32.09"
(815.09mm)		 12.99"
(329.94mm)		 127th Driest
Driest since:
 1910
2nd Wettest
Wettest since:
 1993
Jul 2017–Dec 2018
18-Month 		60.22"
(1,529.59mm)		 48.69"
(1,236.73mm)		 11.53"
(292.86mm)		 117th Driest
Driest since:
 1956
11th Wettest
Wettest since:
 1993
Jan 2017–Dec 2018
24-Month 		77.44"
(1,966.98mm)		 64.24"
(1,631.70mm)		 13.20"
(335.28mm)		 117th Driest
Driest since:
 1989
11th Wettest
Wettest since:
 2019
Jan 2016–Dec 2018
36-Month 		115.54"
(2,934.72mm)		 96.36"
(2,447.54mm)		 19.18"
(487.18mm)		 118th Driest
Driest since:
 1957
9th Wettest
Wettest since:
 2010
Jan 2015–Dec 2018
48-Month 		158.07"
(4,014.98mm)		 128.37"
(3,260.60mm)		 29.70"
(754.38mm)		 123rd Driest
Driest since:
 1958
3rd Wettest
Wettest since:
 2010
Jan 2014–Dec 2018
60-Month 		196.76"
(4,997.70mm)		 160.36"
(4,073.14mm)		 36.40"
(924.56mm)		 121st Driest
Driest since:
 1956
4th Wettest
Wettest since:
 2010

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