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 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
September 2021
1-Month 		3.48"
(88.39mm)		 3.47"
(88.14mm)		 0.01"
(0.25mm)		 77th Driest
Driest since:
 1897
52nd Wettest
Wettest since:
 1926
Aug–Sep 2021
2-Month 		7.89"
(200.41mm)		 7.14"
(181.36mm)		 0.75"
(19.05mm)		 94th Driest
Driest since:
 1897
35th Wettest
Wettest since:
 1926
Ties: 1933
Jul–Sep 2021
3-Month 		13.02"
(330.71mm)		 11.14"
(282.96mm)		 1.88"
(47.75mm)		 106th Driest
Driest since:
 1953
23rd Wettest
Wettest since:
 1926
Jun–Sep 2021
4-Month 		18.12"
(460.25mm)		 15.39"
(390.91mm)		 2.73"
(69.34mm)		 111th Driest
Driest since:
 1953
18th Wettest
Wettest since:
 1915
May–Sep 2021
5-Month 		22.25"
(565.15mm)		 19.66"
(499.36mm)		 2.59"
(65.79mm)		 101st Driest
Driest since:
 1930
28th Wettest
Wettest since:
 1915
Apr–Sep 2021
6-Month 		25.54"
(648.72mm)		 23.57"
(598.68mm)		 1.97"
(50.04mm)		 84th Driest
Driest since:
 1930
45th Wettest
Wettest since:
 2011
Mar–Sep 2021
7-Month 		30.85"
(783.59mm)		 27.38"
(695.45mm)		 3.47"
(88.14mm)		 105th Driest
Driest since:
 1930
24th Wettest
Wettest since:
 1945
Feb–Sep 2021
8-Month 		33.51"
(851.15mm)		 30.05"
(763.27mm)		 3.46"
(87.88mm)		 101st Driest
Driest since:
 1930
28th Wettest
Wettest since:
 1945
Jan–Sep 2021
9-Month 		36.45"
(925.83mm)		 33.10"
(840.74mm)		 3.35"
(85.09mm)		 97th Driest
Driest since:
 1930
32nd Wettest
Wettest since:
 1950
Dec 2020–Sep 2021
10-Month 		39.01"
(990.85mm)		 36.19"
(919.23mm)		 2.82"
(71.62mm)		 88th Driest
Driest since:
 1930
40th Wettest
Wettest since:
 1950
Nov 2020–Sep 2021
11-Month 		41.69"
(1,058.93mm)		 39.33"
(998.98mm)		 2.36"
(59.95mm)		 86th Driest
Driest since:
 1930
42nd Wettest
Wettest since:
 2019
Oct 2020–Sep 2021
12-Month 		45.68"
(1,160.27mm)		 42.25"
(1,073.15mm)		 3.43"
(87.12mm)		 92nd Driest
Driest since:
 1925
36th Wettest
Wettest since:
 2019
Apr 2020–Sep 2021
18-Month 		71.56"
(1,817.62mm)		 65.79"
(1,671.07mm)		 5.77"
(146.55mm)		 101st Driest
Driest since:
 1931
27th Wettest
Wettest since:
 2019
Oct 2019–Sep 2021
24-Month 		97.71"
(2,481.83mm)		 84.47"
(2,145.54mm)		 13.24"
(336.29mm)		 121st Driest
Driest since:
 1941
6th Wettest
Wettest since:
 2020
Oct 2018–Sep 2021
36-Month 		151.90"
(3,858.26mm)		 126.72"
(3,218.69mm)		 25.18"
(639.57mm)		 124th Driest
Driest since:
 1941
2nd Wettest
Wettest since:
 2020
Oct 2017–Sep 2021
48-Month 		201.84"
(5,126.74mm)		 168.99"
(4,292.35mm)		 32.85"
(834.39mm)		 124th Driest
Driest since:
 1956
1st Wettest
Wettest to Date
 2021
Oct 2016–Sep 2021
60-Month 		245.71"
(6,241.03mm)		 211.21"
(5,364.73mm)		 34.50"
(876.30mm)		 121st Driest
Driest since:
 1956
3rd Wettest
Wettest since:
 2020

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