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 1939

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Period Value 1901-2000
Mean		 Anomaly Rank
(1895-2022)		 Wettest/Driest
Since		 Record
September 1939
1-Month 		1.18"
(29.97mm)		 3.47"
(88.14mm)		 -2.29"
(-58.17mm)		 2nd Driest
Driest since:
 1897
127th Wettest
Wettest since:
 1926
Aug–Sep 1939
2-Month 		4.67"
(118.62mm)		 7.14"
(181.36mm)		 -2.47"
(-62.74mm)		 7th Driest
Driest since:
 1897
122nd Wettest
Wettest since:
 1926
Jul–Sep 1939
3-Month 		8.67"
(220.22mm)		 11.14"
(282.96mm)		 -2.47"
(-62.74mm)		 8th Driest
Driest since:
 1953
121st Wettest
Wettest since:
 1926
Jun–Sep 1939
4-Month 		14.59"
(370.59mm)		 15.39"
(390.91mm)		 -0.80"
(-20.32mm)		 44th Driest
Driest since:
 1953
85th Wettest
Wettest since:
 1915
May–Sep 1939
5-Month 		17.16"
(435.86mm)		 19.66"
(499.36mm)		 -2.50"
(-63.50mm)		 24th Driest
Driest since:
 1930
105th Wettest
Wettest since:
 1915
Apr–Sep 1939
6-Month 		22.35"
(567.69mm)		 23.57"
(598.68mm)		 -1.22"
(-30.99mm)		 40th Driest
Driest since:
 1930
89th Wettest
Wettest since:
 2011
Mar–Sep 1939
7-Month 		26.39"
(670.31mm)		 27.38"
(695.45mm)		 -0.99"
(-25.14mm)		 46th Driest
Driest since:
 1930
83rd Wettest
Wettest since:
 1945
Feb–Sep 1939
8-Month 		31.62"
(803.15mm)		 30.05"
(763.27mm)		 1.57"
(39.88mm)		 79th Driest
Driest since:
 1930
50th Wettest
Wettest since:
 1945
Jan–Sep 1939
9-Month 		35.47"
(900.94mm)		 33.10"
(840.74mm)		 2.37"
(60.20mm)		 89th Driest
Driest since:
 1930
40th Wettest
Wettest since:
 1950
Dec 1938–Sep 1939
10-Month 		37.32"
(947.93mm)		 36.19"
(919.23mm)		 1.13"
(28.70mm)		 70th Driest
Driest since:
 1930
58th Wettest
Wettest since:
 1950
Nov 1938–Sep 1939
11-Month 		40.86"
(1,037.84mm)		 39.33"
(998.98mm)		 1.53"
(38.86mm)		 75th Driest
Driest since:
 1930
53rd Wettest
Wettest since:
 2019
Ties: 1938
Oct 1938–Sep 1939
12-Month 		41.79"
(1,061.47mm)		 42.25"
(1,073.15mm)		 -0.46"
(-11.68mm)		 47th Driest
Driest since:
 1925
81st Wettest
Wettest since:
 2019
Apr 1938–Sep 1939
18-Month 		67.13"
(1,705.10mm)		 65.79"
(1,671.07mm)		 1.34"
(34.03mm)		 67th Driest
Driest since:
 1931
61st Wettest
Wettest since:
 2019
Oct 1937–Sep 1939
24-Month 		86.77"
(2,203.96mm)		 84.47"
(2,145.54mm)		 2.30"
(58.42mm)		 70th Driest
Driest since:
 1941
57th Wettest
Wettest since:
 2020
Oct 1936–Sep 1939
36-Month 		132.48"
(3,364.99mm)		 126.72"
(3,218.69mm)		 5.76"
(146.30mm)		 87th Driest
Driest since:
 1941
39th Wettest
Wettest since:
 2020
Oct 1935–Sep 1939
48-Month 		166.04"
(4,217.42mm)		 168.99"
(4,292.35mm)		 -2.95"
(-74.93mm)		 38th Driest
Driest since:
 1956
87th Wettest
Wettest since:
 2021
Oct 1934–Sep 1939
60-Month 		211.87"
(5,381.50mm)		 211.21"
(5,364.73mm)		 0.66"
(16.77mm)		 56th Driest
Driest since:
 1956
68th Wettest
Wettest since:
 2020

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