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 2021

View Period (Months):
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  • Record Driest
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  • Record Wettest
Period Value 1901-2000
Mean		 Anomaly Rank
(1895-2022)		 Wettest/Driest
Since		 Record
December 2021
1-Month 		3.30"
(83.82mm)		 3.11"
(78.99mm)		 0.19"
(4.83mm)		 76th Driest
Driest since:
 1958
53rd Wettest
Wettest since:
 1990
Nov–Dec 2021
2-Month 		4.65"
(118.11mm)		 6.23"
(158.24mm)		 -1.58"
(-40.13mm)		 22nd Driest
Driest since:
 1976
107th Wettest
Wettest since:
 2015
Oct–Dec 2021
3-Month 		9.96"
(252.98mm)		 9.13"
(231.90mm)		 0.83"
(21.08mm)		 76th Driest
Driest since:
 1963
53rd Wettest
Wettest since:
 1990
Sep–Dec 2021
4-Month 		13.44"
(341.38mm)		 12.60"
(320.04mm)		 0.84"
(21.34mm)		 72nd Driest
Driest since:
 1963
57th Wettest
Wettest since:
 1926
Aug–Dec 2021
5-Month 		17.85"
(453.39mm)		 16.27"
(413.26mm)		 1.58"
(40.13mm)		 84th Driest
Driest since:
 1953
45th Wettest
Wettest since:
 1926
Jul–Dec 2021
6-Month 		22.98"
(583.69mm)		 20.27"
(514.86mm)		 2.71"
(68.83mm)		 96th Driest
Driest since:
 1953
33rd Wettest
Wettest since:
 1926
Jun–Dec 2021
7-Month 		28.08"
(713.23mm)		 24.52"
(622.81mm)		 3.56"
(90.42mm)		 105th Driest
Driest since:
 1953
24th Wettest
Wettest since:
 2015
May–Dec 2021
8-Month 		32.21"
(818.13mm)		 28.79"
(731.27mm)		 3.42"
(86.86mm)		 98th Driest
Driest since:
 1953
31st Wettest
Wettest since:
 2015
Apr–Dec 2021
9-Month 		35.50"
(901.70mm)		 32.70"
(830.58mm)		 2.80"
(71.12mm)		 87th Driest
Driest since:
 1930
42nd Wettest
Wettest since:
 2015
Mar–Dec 2021
10-Month 		40.81"
(1,036.57mm)		 36.51"
(927.35mm)		 4.30"
(109.22mm)		 102nd Driest
Driest since:
 1930
27th Wettest
Wettest since:
 2011
Feb–Dec 2021
11-Month 		43.47"
(1,104.14mm)		 39.19"
(995.43mm)		 4.28"
(108.71mm)		 100th Driest
Driest since:
 1930
29th Wettest
Wettest since:
 2011
Jan–Dec 2021
12-Month 		46.41"
(1,178.81mm)		 42.23"
(1,072.64mm)		 4.18"
(106.17mm)		 98th Driest
Driest since:
 1930
31st Wettest
Wettest since:
 2019
Ties: 1949
Jul 2020–Dec 2021
18-Month 		67.61"
(1,717.29mm)		 62.51"
(1,587.75mm)		 5.10"
(129.54mm)		 96th Driest
Driest since:
 1953
32nd Wettest
Wettest since:
 2019
Jan 2020–Dec 2021
24-Month 		95.70"
(2,430.78mm)		 84.45"
(2,145.03mm)		 11.25"
(285.75mm)		 115th Driest
Driest since:
 1953
13th Wettest
Wettest since:
 2019
Jan 2019–Dec 2021
36-Month 		149.66"
(3,801.36mm)		 126.69"
(3,217.93mm)		 22.97"
(583.43mm)		 124th Driest
Driest since:
 1954
3rd Wettest
Wettest since:
 2020
Jan 2018–Dec 2021
48-Month 		202.72"
(5,149.09mm)		 168.95"
(4,291.33mm)		 33.77"
(857.76mm)		 125th Driest
Driest since:
 1955
1st Wettest
Wettest to Date
 2021
Jan 2017–Dec 2021
60-Month 		248.08"
(6,301.23mm)		 211.20"
(5,364.48mm)		 36.88"
(936.75mm)		 124th Driest
Driest since:
 1956
1st Wettest
Wettest to Date
 2021

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