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 2020

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 2020
1-Month 		3.80"
(96.52mm)		 3.67"
(93.22mm)		 0.13"
(3.30mm)		 73rd Driest
Driest since:
 1953
56th Wettest
Wettest since:
 1915
Jul–Aug 2020
2-Month 		8.73"
(221.74mm)		 7.67"
(194.82mm)		 1.06"
(26.92mm)		 100th Driest
Driest since:
 1930
29th Wettest
Wettest since:
 1915
Jun–Aug 2020
3-Month 		12.64"
(321.06mm)		 11.92"
(302.77mm)		 0.72"
(18.29mm)		 78th Driest
Driest since:
 1930
51st Wettest
Wettest since:
 1958
May–Aug 2020
4-Month 		18.07"
(458.98mm)		 16.19"
(411.23mm)		 1.88"
(47.75mm)		 92nd Driest
Driest since:
 1936
37th Wettest
Wettest since:
 1915
Apr–Aug 2020
5-Month 		22.64"
(575.06mm)		 20.10"
(510.54mm)		 2.54"
(64.52mm)		 96th Driest
Driest since:
 1930
33rd Wettest
Wettest since:
 2015
Mar–Aug 2020
6-Month 		28.11"
(713.99mm)		 23.91"
(607.31mm)		 4.20"
(106.68mm)		 115th Driest
Driest since:
 1930
14th Wettest
Wettest since:
 2015
Feb–Aug 2020
7-Month 		32.25"
(819.15mm)		 26.58"
(675.13mm)		 5.67"
(144.02mm)		 119th Driest
Driest since:
 1930
10th Wettest
Wettest since:
 2019
Jan–Aug 2020
8-Month 		36.82"
(935.23mm)		 29.63"
(752.60mm)		 7.19"
(182.63mm)		 126th Driest
Driest since:
 1936
3rd Wettest
Wettest since:
 2019
Dec 2019–Aug 2020
9-Month 		40.39"
(1,025.91mm)		 32.72"
(831.09mm)		 7.67"
(194.82mm)		 123rd Driest
Driest since:
 1936
5th Wettest
Wettest since:
 2019
Nov 2019–Aug 2020
10-Month 		43.53"
(1,105.66mm)		 35.86"
(910.84mm)		 7.67"
(194.82mm)		 123rd Driest
Driest since:
 1936
5th Wettest
Wettest since:
 2019
Oct 2019–Aug 2020
11-Month 		48.79"
(1,239.27mm)		 38.78"
(985.01mm)		 10.01"
(254.26mm)		 125th Driest
Driest since:
 1936
3rd Wettest
Wettest since:
 2019
Sep 2019–Aug 2020
12-Month 		51.08"
(1,297.43mm)		 42.24"
(1,072.90mm)		 8.84"
(224.53mm)		 123rd Driest
Driest since:
 1936
5th Wettest
Wettest since:
 2019
Mar 2019–Aug 2020
18-Month 		81.12"
(2,060.45mm)		 66.13"
(1,679.70mm)		 14.99"
(380.75mm)		 126th Driest
Driest since:
 1931
2nd Wettest
Wettest since:
 2019
Sep 2018–Aug 2020
24-Month 		108.90"
(2,766.06mm)		 84.47"
(2,145.54mm)		 24.43"
(620.52mm)		 126th Driest
Driest since:
 1941
1st Wettest
Wettest to Date
 2020
Sep 2017–Aug 2020
36-Month 		155.09"
(3,939.29mm)		 126.74"
(3,219.20mm)		 28.35"
(720.09mm)		 125th Driest
Driest since:
 1941
1st Wettest
Wettest to Date
 2020
Sep 2016–Aug 2020
48-Month 		200.07"
(5,081.78mm)		 168.98"
(4,292.09mm)		 31.09"
(789.69mm)		 122nd Driest
Driest since:
 1956
3rd Wettest
Wettest to Date
 2022
Sep 2015–Aug 2020
60-Month 		248.59"
(6,314.19mm)		 211.20"
(5,364.48mm)		 37.39"
(949.71mm)		 123rd Driest
Driest since:
 1934
1st Wettest
Wettest to Date
 2020

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