Regional Rankings

Regional Data Info
Please note, Palmer Indices are not available for NWS Regions. Degree Days are not available for Great Plains, Souther Plains and Gulf Coast Rockies and Westward, River Basins, or Agricultural Belts. 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 1951

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Period Value 1901-2000
Mean		 Anomaly Rank
(1895-2022)		 Wettest/Driest
Since		 Record
September 1951
1-Month 		3.94"
(100.08mm)		 3.47"
(88.14mm)		 0.47"
(11.94mm)		 91st Driest
Driest since:
 1897
38th Wettest
Wettest since:
 1926
Aug–Sep 1951
2-Month 		7.19"
(182.63mm)		 7.14"
(181.36mm)		 0.05"
(1.27mm)		 74th Driest
Driest since:
 1897
55th Wettest
Wettest since:
 1926
Jul–Sep 1951
3-Month 		11.45"
(290.83mm)		 11.14"
(282.96mm)		 0.31"
(7.87mm)		 71st Driest
Driest since:
 1953
58th Wettest
Wettest since:
 1926
Jun–Sep 1951
4-Month 		17.69"
(449.33mm)		 15.39"
(390.91mm)		 2.30"
(58.42mm)		 102nd Driest
Driest since:
 1953
27th Wettest
Wettest since:
 1915
May–Sep 1951
5-Month 		20.78"
(527.81mm)		 19.66"
(499.36mm)		 1.12"
(28.45mm)		 76th Driest
Driest since:
 1930
53rd Wettest
Wettest since:
 1915
Apr–Sep 1951
6-Month 		24.35"
(618.49mm)		 23.57"
(598.68mm)		 0.78"
(19.81mm)		 67th Driest
Driest since:
 1930
62nd Wettest
Wettest since:
 2011
Mar–Sep 1951
7-Month 		28.60"
(726.44mm)		 27.38"
(695.45mm)		 1.22"
(30.99mm)		 75th Driest
Driest since:
 1930
54th Wettest
Wettest since:
 1945
Feb–Sep 1951
8-Month 		32.80"
(833.12mm)		 30.05"
(763.27mm)		 2.75"
(69.85mm)		 91st Driest
Driest since:
 1930
38th Wettest
Wettest since:
 1945
Jan–Sep 1951
9-Month 		36.87"
(936.50mm)		 33.10"
(840.74mm)		 3.77"
(95.76mm)		 102nd Driest
Driest since:
 1930
27th Wettest
Wettest since:
 1950
Dec 1950–Sep 1951
10-Month 		38.73"
(983.74mm)		 36.19"
(919.23mm)		 2.54"
(64.51mm)		 83rd Driest
Driest since:
 1930
45th Wettest
Wettest since:
 1950
Nov 1950–Sep 1951
11-Month 		42.54"
(1,080.52mm)		 39.33"
(998.98mm)		 3.21"
(81.54mm)		 96th Driest
Driest since:
 1930
32nd Wettest
Wettest since:
 2019
Oct 1950–Sep 1951
12-Month 		44.12"
(1,120.65mm)		 42.25"
(1,073.15mm)		 1.87"
(47.50mm)		 74th Driest
Driest since:
 1925
54th Wettest
Wettest since:
 2019
Apr 1950–Sep 1951
18-Month 		71.05"
(1,804.67mm)		 65.79"
(1,671.07mm)		 5.26"
(133.60mm)		 99th Driest
Driest since:
 1931
29th Wettest
Wettest since:
 2019
Oct 1949–Sep 1951
24-Month 		97.20"
(2,468.88mm)		 84.47"
(2,145.54mm)		 12.73"
(323.34mm)		 119th Driest
Driest since:
 1941
8th Wettest
Wettest since:
 2020
Oct 1948–Sep 1951
36-Month 		144.63"
(3,673.60mm)		 126.72"
(3,218.69mm)		 17.91"
(454.91mm)		 119th Driest
Driest since:
 1941
7th Wettest
Wettest to Date
 2020
Oct 1947–Sep 1951
48-Month 		185.34"
(4,707.64mm)		 168.99"
(4,292.35mm)		 16.35"
(415.29mm)		 113th Driest
Driest since:
 1956
12th Wettest
Wettest since:
 2021
Oct 1946–Sep 1951
60-Month 		228.13"
(5,794.50mm)		 211.21"
(5,364.73mm)		 16.92"
(429.77mm)		 109th Driest
Driest since:
 1956
15th Wettest
Wettest to Date
 2020

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