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Public Information Statement National Weather Service Wilmington OH 210 PM EST Thu Mar 9 2017 ...FROST/FREEZE HEADLINE INFORMATION... A temperature of 32 degrees fahrenheit has officially been recorded as late as May 25 in Cincinnati, May 16 at Columbus and May 21 at Dayton. However, elements such as topography, urban or rural setting and placement of the recording instrument can create wide variations in temperatures across an area. National Weather Service temperatures are officially taken at an elevation of five feet above the ground, but the temperature at ground level may be colder. On typical spring nights when frost occurs, the temperatures at the five foot level may read 36 degrees while at ground level it is actually the 32 degrees needed to form frost. The following reference table will give an idea as to when the last freezing temperatures might occur, based on the last 30 years of climatological data (1981 to 2010) at each of the listed locations. Location Avg date Last 32F in one Last 32F in nine last 32F year out of ten years out of ten in Spring (10% probability) (90% probability) ..Southwest Ohio Cincinnati (KLUK) Apr 17 Apr 3 May 1 Hamilton (KHAO) Apr 19 Apr 4 May 4 Milford Apr 20 Apr 4 May 4 Wilmington Apr 20 Apr 5 May 4 ..Central Ohio Circleville Apr 21 Apr 6 May 5 Columbus (KCMH) Apr 16 Apr 1 May 1 Delaware Apr 25 Apr 11 May 9 Lancaster Apr 19 Apr 5 May 6 Logan May 2 Apr 19 May 18 London Apr 27 Apr 14 May 9 Marysville Apr 19 Apr 4 May 4 Newark Apr 28 Apr 16 May 14 Washington CH Apr 18 Apr 4 May 3 ..Miami Valley Bellefontaine Apr 25 Apr 10 May 11 Celina Apr 22 Apr 8 May 6 Dayton (KDAY) Apr 19 Apr 5 May 3 Eaton Apr 22 Apr 9 May 6 Greenville Apr 23 Apr 9 May 7 Kenton Apr 23 Apr 9 May 8 Springfield Apr 25 Apr 12 May 9 Xenia Apr 17 Apr 2 May 2 ..South Central Ohio Chillicothe Apr 21 Apr 7 May 6 Hillsboro Apr 17 Apr 3 May 1 Portsmouth Apr 17 Apr 1 May 4 ..Kentucky Carrollton Apr 16 Mar 31 May 3 Covington (KCVG) Apr 16 Apr 2 May 2 Falmouth Apr 21 Apr 5 May 8 Maysville Apr 18 Apr 4 May 1 Warsaw Apr 23 Apr 7 May 8 Williamston Apr 14 Mar 29 Apr 30 ..Indiana Brookville Apr 21 Apr 7 May 5 Milan Apr 28 Apr 13 May 16 Richmond Apr 23 Apr 9 May 8 Vevay Apr 15 Mar 31 Apr 30 $$ |