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, September 2011

View Period (Months):
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  • Record Wettest
Period Value 1901-2000
Mean		 Anomaly Rank
(1895-2022)		 Wettest/Driest
Since		 Record
September 2011
1-Month 		4.79"
(121.67mm)		 3.47"
(88.14mm)		 1.32"
(33.53mm)		 111th Driest
Driest since:
 1897
18th Wettest
Wettest since:
 1926
Aug–Sep 2011
2-Month 		7.65"
(194.31mm)		 7.14"
(181.36mm)		 0.51"
(12.95mm)		 86th Driest
Driest since:
 1897
43rd Wettest
Wettest since:
 1926
Ties: 1936
Jul–Sep 2011
3-Month 		10.94"
(277.88mm)		 11.14"
(282.96mm)		 -0.20"
(-5.08mm)		 59th Driest
Driest since:
 1953
70th Wettest
Wettest since:
 1926
Jun–Sep 2011
4-Month 		15.97"
(405.64mm)		 15.39"
(390.91mm)		 0.58"
(14.73mm)		 69th Driest
Driest since:
 1953
60th Wettest
Wettest since:
 1915
May–Sep 2011
5-Month 		21.95"
(557.53mm)		 19.66"
(499.36mm)		 2.29"
(58.17mm)		 93rd Driest
Driest since:
 1930
36th Wettest
Wettest since:
 1915
Apr–Sep 2011
6-Month 		30.67"
(779.02mm)		 23.57"
(598.68mm)		 7.10"
(180.34mm)		 128th Driest
Driest since:
 1930
1st Wettest
Wettest to Date
 2011
Mar–Sep 2011
7-Month 		35.02"
(889.51mm)		 27.38"
(695.45mm)		 7.64"
(194.06mm)		 127th Driest
Driest since:
 1930
2nd Wettest
Wettest since:
 1945
Feb–Sep 2011
8-Month 		38.94"
(989.08mm)		 30.05"
(763.27mm)		 8.89"
(225.81mm)		 127th Driest
Driest since:
 1930
2nd Wettest
Wettest since:
 1945
Jan–Sep 2011
9-Month 		40.64"
(1,032.26mm)		 33.10"
(840.74mm)		 7.54"
(191.52mm)		 124th Driest
Driest since:
 1930
5th Wettest
Wettest since:
 1950
Dec 2010–Sep 2011
10-Month 		42.63"
(1,082.80mm)		 36.19"
(919.23mm)		 6.44"
(163.57mm)		 117th Driest
Driest since:
 1930
11th Wettest
Wettest since:
 1950
Nov 2010–Sep 2011
11-Month 		46.65"
(1,184.91mm)		 39.33"
(998.98mm)		 7.32"
(185.93mm)		 116th Driest
Driest since:
 1930
12th Wettest
Wettest since:
 2019
Oct 2010–Sep 2011
12-Month 		48.24"
(1,225.30mm)		 42.25"
(1,073.15mm)		 5.99"
(152.15mm)		 111th Driest
Driest since:
 1925
17th Wettest
Wettest since:
 2019
Apr 2010–Sep 2011
18-Month 		75.18"
(1,909.57mm)		 65.79"
(1,671.07mm)		 9.39"
(238.50mm)		 116th Driest
Driest since:
 1931
12th Wettest
Wettest since:
 2019
Oct 2009–Sep 2011
24-Month 		95.81"
(2,433.57mm)		 84.47"
(2,145.54mm)		 11.34"
(288.03mm)		 115th Driest
Driest since:
 1941
12th Wettest
Wettest since:
 2020
Oct 2008–Sep 2011
36-Month 		142.47"
(3,618.74mm)		 126.72"
(3,218.69mm)		 15.75"
(400.05mm)		 115th Driest
Driest since:
 1941
11th Wettest
Wettest since:
 2020
Oct 2007–Sep 2011
48-Month 		193.97"
(4,926.84mm)		 168.99"
(4,292.35mm)		 24.98"
(634.49mm)		 120th Driest
Driest since:
 1956
5th Wettest
Wettest to Date
 2021
Oct 2006–Sep 2011
60-Month 		233.49"
(5,930.65mm)		 211.21"
(5,364.73mm)		 22.28"
(565.92mm)		 117th Driest
Driest since:
 1956
7th Wettest
Wettest to Date
 2020

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