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 1971

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Period Value 1901-2000
Mean		 Anomaly Rank
(1895-2022)		 Wettest/Driest
Since		 Record
September 1971
1-Month 		3.96"
(100.58mm)		 3.47"
(88.14mm)		 0.49"
(12.44mm)		 92nd Driest
Driest since:
 1897
37th Wettest
Wettest since:
 1926
Aug–Sep 1971
2-Month 		6.77"
(171.96mm)		 7.14"
(181.36mm)		 -0.37"
(-9.40mm)		 60th Driest
Driest since:
 1897
69th Wettest
Wettest since:
 1926
Ties: 1904
Jul–Sep 1971
3-Month 		11.81"
(299.97mm)		 11.14"
(282.96mm)		 0.67"
(17.01mm)		 83rd Driest
Driest since:
 1953
46th Wettest
Wettest since:
 1926
Jun–Sep 1971
4-Month 		15.33"
(389.38mm)		 15.39"
(390.91mm)		 -0.06"
(-1.53mm)		 59th Driest
Driest since:
 1953
70th Wettest
Wettest since:
 1915
May–Sep 1971
5-Month 		19.69"
(500.13mm)		 19.66"
(499.36mm)		 0.03"
(0.77mm)		 53rd Driest
Driest since:
 1930
76th Wettest
Wettest since:
 1915
Apr–Sep 1971
6-Month 		21.53"
(546.86mm)		 23.57"
(598.68mm)		 -2.04"
(-51.82mm)		 31st Driest
Driest since:
 1930
98th Wettest
Wettest since:
 2011
Mar–Sep 1971
7-Month 		23.49"
(596.65mm)		 27.38"
(695.45mm)		 -3.89"
(-98.80mm)		 15th Driest
Driest since:
 1930
114th Wettest
Wettest since:
 1945
Feb–Sep 1971
8-Month 		27.24"
(691.90mm)		 30.05"
(763.27mm)		 -2.81"
(-71.37mm)		 28th Driest
Driest since:
 1930
101st Wettest
Wettest since:
 1945
Jan–Sep 1971
9-Month 		29.65"
(753.11mm)		 33.10"
(840.74mm)		 -3.45"
(-87.63mm)		 22nd Driest
Driest since:
 1930
107th Wettest
Wettest since:
 1950
Dec 1970–Sep 1971
10-Month 		32.40"
(822.96mm)		 36.19"
(919.23mm)		 -3.79"
(-96.27mm)		 22nd Driest
Driest since:
 1930
106th Wettest
Wettest since:
 1950
Nov 1970–Sep 1971
11-Month 		34.57"
(878.08mm)		 39.33"
(998.98mm)		 -4.76"
(-120.90mm)		 17th Driest
Driest since:
 1930
111th Wettest
Wettest since:
 2019
Oct 1970–Sep 1971
12-Month 		38.72"
(983.49mm)		 42.25"
(1,073.15mm)		 -3.53"
(-89.66mm)		 21st Driest
Driest since:
 1925
107th Wettest
Wettest since:
 2019
Apr 1970–Sep 1971
18-Month 		66.67"
(1,693.42mm)		 65.79"
(1,671.07mm)		 0.88"
(22.35mm)		 61st Driest
Driest since:
 1931
67th Wettest
Wettest since:
 2019
Oct 1969–Sep 1971
24-Month 		82.73"
(2,101.34mm)		 84.47"
(2,145.54mm)		 -1.74"
(-44.20mm)		 43rd Driest
Driest since:
 1941
84th Wettest
Wettest since:
 2020
Oct 1968–Sep 1971
36-Month 		125.04"
(3,176.02mm)		 126.72"
(3,218.69mm)		 -1.68"
(-42.67mm)		 44th Driest
Driest since:
 1941
82nd Wettest
Wettest since:
 2020
Oct 1967–Sep 1971
48-Month 		167.69"
(4,259.33mm)		 168.99"
(4,292.35mm)		 -1.30"
(-33.02mm)		 49th Driest
Driest since:
 1956
76th Wettest
Wettest since:
 2021
Oct 1966–Sep 1971
60-Month 		208.46"
(5,294.88mm)		 211.21"
(5,364.73mm)		 -2.75"
(-69.85mm)		 41st Driest
Driest since:
 1956
83rd Wettest
Wettest since:
 2020

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