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, December 1909

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Period Value 1901-2000
Mean		 Anomaly Rank
(1895-2022)		 Wettest/Driest
Since		 Record
December 1909
1-Month 		3.03"
(76.96mm)		 3.11"
(78.99mm)		 -0.08"
(-2.03mm)		 59th Driest
Driest since:
 1958
70th Wettest
Wettest since:
 1990
Nov–Dec 1909
2-Month 		6.20"
(157.48mm)		 6.23"
(158.24mm)		 -0.03"
(-0.76mm)		 69th Driest
Driest since:
 1976
60th Wettest
Wettest since:
 2015
Oct–Dec 1909
3-Month 		8.86"
(225.04mm)		 9.13"
(231.90mm)		 -0.27"
(-6.86mm)		 55th Driest
Driest since:
 1963
74th Wettest
Wettest since:
 1990
Sep–Dec 1909
4-Month 		12.22"
(310.39mm)		 12.60"
(320.04mm)		 -0.38"
(-9.65mm)		 56th Driest
Driest since:
 1963
73rd Wettest
Wettest since:
 1926
Aug–Dec 1909
5-Month 		14.52"
(368.81mm)		 16.27"
(413.26mm)		 -1.75"
(-44.45mm)		 36th Driest
Driest since:
 1953
93rd Wettest
Wettest since:
 1926
Ties: 1933
Jul–Dec 1909
6-Month 		19.65"
(499.11mm)		 20.27"
(514.86mm)		 -0.62"
(-15.75mm)		 43rd Driest
Driest since:
 1953
86th Wettest
Wettest since:
 1926
Ties: 1914, 1965, 1989
Jun–Dec 1909
7-Month 		25.02"
(635.51mm)		 24.52"
(622.81mm)		 0.50"
(12.70mm)		 62nd Driest
Driest since:
 1953
67th Wettest
Wettest since:
 2015
May–Dec 1909
8-Month 		29.86"
(758.44mm)		 28.79"
(731.27mm)		 1.07"
(27.17mm)		 65th Driest
Driest since:
 1953
64th Wettest
Wettest since:
 2015
Apr–Dec 1909
9-Month 		35.07"
(890.78mm)		 32.70"
(830.58mm)		 2.37"
(60.20mm)		 80th Driest
Driest since:
 1930
49th Wettest
Wettest since:
 2015
Mar–Dec 1909
10-Month 		38.59"
(980.19mm)		 36.51"
(927.35mm)		 2.08"
(52.84mm)		 82nd Driest
Driest since:
 1930
47th Wettest
Wettest since:
 2011
Feb–Dec 1909
11-Month 		43.72"
(1,110.49mm)		 39.19"
(995.43mm)		 4.53"
(115.06mm)		 104th Driest
Driest since:
 1930
25th Wettest
Wettest since:
 2011
Jan–Dec 1909
12-Month 		46.54"
(1,182.12mm)		 42.23"
(1,072.64mm)		 4.31"
(109.48mm)		 99th Driest
Driest since:
 1930
30th Wettest
Wettest since:
 2019
Jul 1908–Dec 1909
18-Month 		60.70"
(1,541.78mm)		 62.51"
(1,587.75mm)		 -1.81"
(-45.97mm)		 38th Driest
Driest since:
 1953
90th Wettest
Wettest since:
 2019
Jan 1908–Dec 1909
24-Month 		86.37"
(2,193.80mm)		 84.45"
(2,145.03mm)		 1.92"
(48.77mm)		 73rd Driest
Driest since:
 1953
55th Wettest
Wettest since:
 2019
Jan 1907–Dec 1909
36-Month 		131.32"
(3,335.53mm)		 126.69"
(3,217.93mm)		 4.63"
(117.60mm)		 80th Driest
Driest since:
 1954
47th Wettest
Wettest since:
 2020
Jan 1906–Dec 1909
48-Month 		173.98"
(4,419.09mm)		 168.95"
(4,291.33mm)		 5.03"
(127.76mm)		 83rd Driest
Driest since:
 1955
43rd Wettest
Wettest to Date
 2021
Jan 1905–Dec 1909
60-Month 		218.26"
(5,543.80mm)		 211.20"
(5,364.48mm)		 7.06"
(179.32mm)		 82nd Driest
Driest since:
 1956
43rd Wettest
Wettest to Date
 2021

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