Regional Rankings

Regional Data Info
Please note, Palmer Indices are not available for NWS Regions. Palmer Drought Severity Index (PDSI), Palmer Hydrological Drought Index (PHDI), and Palmer Modified Drought Index (PMDI) are not offered for multiple-month time scales.

Ohio Valley Climate Region

Precipitation Rankings, August 2021

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
August 2021
1-Month 		4.41"
(112.01mm)		 3.67"
(93.22mm)		 0.74"
(18.79mm)		 101st Driest
Driest since:
 1953
28th Wettest
Wettest since:
 1915
Jul–Aug 2021
2-Month 		9.55"
(242.57mm)		 7.67"
(194.82mm)		 1.88"
(47.75mm)		 118th Driest
Driest since:
 1930
11th Wettest
Wettest since:
 1915
Jun–Aug 2021
3-Month 		14.65"
(372.11mm)		 11.92"
(302.77mm)		 2.73"
(69.34mm)		 118th Driest
Driest since:
 1930
11th Wettest
Wettest since:
 1958
May–Aug 2021
4-Month 		18.78"
(477.01mm)		 16.19"
(411.23mm)		 2.59"
(65.78mm)		 104th Driest
Driest since:
 1936
25th Wettest
Wettest since:
 1915
Apr–Aug 2021
5-Month 		22.07"
(560.58mm)		 20.10"
(510.54mm)		 1.97"
(50.04mm)		 88th Driest
Driest since:
 1930
41st Wettest
Wettest since:
 2015
Mar–Aug 2021
6-Month 		27.38"
(695.45mm)		 23.91"
(607.31mm)		 3.47"
(88.14mm)		 105th Driest
Driest since:
 1930
24th Wettest
Wettest since:
 2015
Feb–Aug 2021
7-Month 		30.04"
(763.02mm)		 26.58"
(675.13mm)		 3.46"
(87.89mm)		 99th Driest
Driest since:
 1930
30th Wettest
Wettest since:
 2019
Jan–Aug 2021
8-Month 		32.99"
(837.95mm)		 29.63"
(752.60mm)		 3.36"
(85.35mm)		 97th Driest
Driest since:
 1936
32nd Wettest
Wettest since:
 2019
Dec 2020–Aug 2021
9-Month 		35.55"
(902.97mm)		 32.72"
(831.09mm)		 2.83"
(71.88mm)		 91st Driest
Driest since:
 1936
37th Wettest
Wettest since:
 2019
Nov 2020–Aug 2021
10-Month 		38.23"
(971.04mm)		 35.86"
(910.84mm)		 2.37"
(60.20mm)		 82nd Driest
Driest since:
 1936
46th Wettest
Wettest since:
 2019
Oct 2020–Aug 2021
11-Month 		42.22"
(1,072.39mm)		 38.78"
(985.01mm)		 3.44"
(87.38mm)		 91st Driest
Driest since:
 1936
37th Wettest
Wettest since:
 2019
Sep 2020–Aug 2021
12-Month 		45.46"
(1,154.68mm)		 42.24"
(1,072.90mm)		 3.22"
(81.78mm)		 87th Driest
Driest since:
 1936
41st Wettest
Wettest since:
 2019
Mar 2020–Aug 2021
18-Month 		73.57"
(1,868.68mm)		 66.13"
(1,679.70mm)		 7.44"
(188.98mm)		 110th Driest
Driest since:
 1931
18th Wettest
Wettest since:
 2019
Sep 2019–Aug 2021
24-Month 		96.54"
(2,452.12mm)		 84.47"
(2,145.54mm)		 12.07"
(306.58mm)		 117th Driest
Driest since:
 1941
10th Wettest
Wettest since:
 2020
Sep 2018–Aug 2021
36-Month 		154.36"
(3,920.74mm)		 126.74"
(3,219.20mm)		 27.62"
(701.54mm)		 124th Driest
Driest since:
 1941
2nd Wettest
Wettest since:
 2020
Sep 2017–Aug 2021
48-Month 		200.55"
(5,093.97mm)		 168.98"
(4,292.09mm)		 31.57"
(801.88mm)		 123rd Driest
Driest since:
 1956
2nd Wettest
Wettest to Date
 2022
Sep 2016–Aug 2021
60-Month 		245.53"
(6,236.46mm)		 211.19"
(5,364.23mm)		 34.34"
(872.23mm)		 120th Driest
Driest since:
 1934
4th Wettest
Wettest since:
 2020

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