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, December 2020

View Period (Months):
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  • Record Wettest
Period Value 1901-2000
Mean		 Anomaly Rank
(1895-2021)		 Wettest/Driest
Since		 Record
December 2020
1-Month 		2.56"
(65.02mm)		 3.11"
(78.99mm)		 -0.55"
(-13.97mm)		 42nd Driest
Driest since:
 1958
86th Wettest
Wettest since:
 1990
Nov–Dec 2020
2-Month 		5.24"
(133.10mm)		 6.23"
(158.24mm)		 -0.99"
(-25.14mm)		 42nd Driest
Driest since:
 1976
86th Wettest
Wettest since:
 2015
Ties: 1998
Oct–Dec 2020
3-Month 		9.23"
(234.44mm)		 9.13"
(231.90mm)		 0.10"
(2.54mm)		 61st Driest
Driest since:
 1963
67th Wettest
Wettest since:
 1990
Sep–Dec 2020
4-Month 		12.47"
(316.74mm)		 12.60"
(320.04mm)		 -0.13"
(-3.30mm)		 59th Driest
Driest since:
 1963
69th Wettest
Wettest since:
 1926
Aug–Dec 2020
5-Month 		16.27"
(413.26mm)		 16.27"
(413.26mm)		 0.00"
(0.00mm)		 59th Driest
Driest since:
 1953
69th Wettest
Wettest since:
 1926
Ties: 1969
Jul–Dec 2020
6-Month 		21.20"
(538.48mm)		 20.27"
(514.86mm)		 0.93"
(23.62mm)		 72nd Driest
Driest since:
 1953
56th Wettest
Wettest since:
 1926
Jun–Dec 2020
7-Month 		25.11"
(637.79mm)		 24.52"
(622.81mm)		 0.59"
(14.98mm)		 63rd Driest
Driest since:
 1953
65th Wettest
Wettest since:
 2015
May–Dec 2020
8-Month 		30.54"
(775.72mm)		 28.79"
(731.27mm)		 1.75"
(44.45mm)		 74th Driest
Driest since:
 1953
54th Wettest
Wettest since:
 2015
Apr–Dec 2020
9-Month 		35.11"
(891.79mm)		 32.70"
(830.58mm)		 2.41"
(61.21mm)		 81st Driest
Driest since:
 1930
47th Wettest
Wettest since:
 2015
Mar–Dec 2020
10-Month 		40.58"
(1,030.73mm)		 36.51"
(927.35mm)		 4.07"
(103.38mm)		 96th Driest
Driest since:
 1930
32nd Wettest
Wettest since:
 2011
Feb–Dec 2020
11-Month 		44.72"
(1,135.89mm)		 39.19"
(995.43mm)		 5.53"
(140.46mm)		 111th Driest
Driest since:
 1930
17th Wettest
Wettest since:
 2011
Jan–Dec 2020
12-Month 		49.29"
(1,251.97mm)		 42.23"
(1,072.64mm)		 7.06"
(179.33mm)		 114th Driest
Driest since:
 1930
14th Wettest
Wettest since:
 2019
Jul 2019–Dec 2020
18-Month 		72.29"
(1,836.17mm)		 62.51"
(1,587.75mm)		 9.78"
(248.42mm)		 117th Driest
Driest since:
 1953
10th Wettest
Wettest since:
 2019
Jan 2019–Dec 2020
24-Month 		103.25"
(2,622.55mm)		 84.45"
(2,145.03mm)		 18.80"
(477.52mm)		 125th Driest
Driest since:
 1953
2nd Wettest
Wettest since:
 2019
Jan 2018–Dec 2020
36-Month 		156.31"
(3,970.27mm)		 126.69"
(3,217.93mm)		 29.62"
(752.34mm)		 125th Driest
Driest since:
 1954
1st Wettest
Wettest to Date
 2020
Jan 2017–Dec 2020
48-Month 		201.67"
(5,122.42mm)		 168.95"
(4,291.33mm)		 32.72"
(831.09mm)		 123rd Driest
Driest since:
 1955
2nd Wettest
Wettest to Date
 2021
Jan 2016–Dec 2020
60-Month 		244.13"
(6,200.90mm)		 211.20"
(5,364.48mm)		 32.93"
(836.42mm)		 121st Driest
Driest since:
 1956
3rd Wettest
Wettest since:
 2021

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