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 1975

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  • Record Wettest
PeriodValue1901-2000
Mean		AnomalyRank
(1895-2022)		Wettest/Driest
Since		Record
September 1975
1-Month		4.58"
(116.33mm)		3.47"
(88.14mm)		1.11"
(28.19mm)		109th Driest
Driest since:
1897
20th Wettest
Wettest since:
1926
Aug–Sep 1975
2-Month		9.48"
(240.79mm)		7.14"
(181.36mm)		2.34"
(59.43mm)		115th Driest
Driest since:
1897
14th Wettest
Wettest since:
1926
Jul–Sep 1975
3-Month		12.38"
(314.45mm)		11.14"
(282.96mm)		1.24"
(31.49mm)		97th Driest
Driest since:
1953
32nd Wettest
Wettest since:
1926
Jun–Sep 1975
4-Month		16.47"
(418.34mm)		15.39"
(390.91mm)		1.08"
(27.43mm)		81st Driest
Driest since:
1953
48th Wettest
Wettest since:
1915
May–Sep 1975
5-Month		20.59"
(522.99mm)		19.66"
(499.36mm)		0.93"
(23.63mm)		71st Driest
Driest since:
1930
58th Wettest
Wettest since:
1915
Apr–Sep 1975
6-Month		24.48"
(621.79mm)		23.57"
(598.68mm)		0.91"
(23.11mm)		68th Driest
Driest since:
1930
61st Wettest
Wettest since:
2011
Mar–Sep 1975
7-Month		30.69"
(779.53mm)		27.38"
(695.45mm)		3.31"
(84.08mm)		100th Driest
Driest since:
1930
29th Wettest
Wettest since:
1945
Ties: 1977
Feb–Sep 1975
8-Month		34.54"
(877.32mm)		30.05"
(763.27mm)		4.49"
(114.05mm)		108th Driest
Driest since:
1930
21st Wettest
Wettest since:
1945
Jan–Sep 1975
9-Month		38.40"
(975.36mm)		33.10"
(840.74mm)		5.30"
(134.62mm)		114th Driest
Driest since:
1930
15th Wettest
Wettest since:
1950
Dec 1974–Sep 1975
10-Month		41.54"
(1,055.12mm)		36.19"
(919.23mm)		5.35"
(135.89mm)		113th Driest
Driest since:
1930
15th Wettest
Wettest since:
1950
Ties: 2013
Nov 1974–Sep 1975
11-Month		45.18"
(1,147.57mm)		39.33"
(998.98mm)		5.85"
(148.59mm)		111th Driest
Driest since:
1930
17th Wettest
Wettest since:
2019
Oct 1974–Sep 1975
12-Month		47.11"
(1,196.59mm)		42.25"
(1,073.15mm)		4.86"
(123.44mm)		104th Driest
Driest since:
1925
24th Wettest
Wettest since:
2019
Apr 1974–Sep 1975
18-Month		73.68"
(1,871.47mm)		65.79"
(1,671.07mm)		7.89"
(200.40mm)		111th Driest
Driest since:
1931
17th Wettest
Wettest since:
2019
Oct 1973–Sep 1975
24-Month		97.68"
(2,481.07mm)		84.47"
(2,145.54mm)		13.21"
(335.53mm)		120th Driest
Driest since:
1941
7th Wettest
Wettest since:
2020
Oct 1972–Sep 1975
36-Month		149.60"
(3,799.84mm)		126.72"
(3,218.69mm)		22.88"
(581.15mm)		123rd Driest
Driest since:
1941
3rd Wettest
Wettest to Date
2020
Oct 1971–Sep 1975
48-Month		192.46"
(4,888.48mm)		168.99"
(4,292.35mm)		23.47"
(596.13mm)		119th Driest
Driest since:
1956
6th Wettest
Wettest to Date
2021
Oct 1970–Sep 1975
60-Month		231.18"
(5,871.97mm)		211.21"
(5,364.73mm)		19.97"
(507.24mm)		116th Driest
Driest since:
1956
8th Wettest
Wettest to Date
2020

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