PUBLIC INFORMATION STATEMENT
NATIONAL WEATHER SERVICE WILMINGTON OH
500 PM EDT THU APR 10 2008
WHEN DOES THE LAST FREEZE OF THE SEASON NORMALLY OCCUR?
A TEMPERATURE OF 32 DEGREES FARENHEIGHT HAS OFFICIALLY BEEN RECORDED
AS LATE AS MAY 25TH IN CINCINNATI...MAY 16TH AT COLUMBUS AND MAY
22ND 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 AT LEAST 30 YEARS OF
CLIMATOLOGICAL DATA FROM 1961-90 AT EACH OF THE LISTED LOCATIONS.
LOCATION AVG DATE LAST LAST 32F IN ONE LAST 32F IN NINE
32F IN SPRING YEAR OUT OF TEN YEARS OUT OF TEN
(10% PROBABILITY) (90% PROBABILITY)
..SOUTHWEST OHIO
CINCINNATI APR 21 APR 8 MAY 5
DAYTON APR 24 APR 2 MAY 9
HAMILTON APR 28 APR 14 MAY 11
HILLSBORO APR 23 APR 9 MAY 7
MILFORD APR 30 APR 17 MAY 18
WILMINGTON MAY 2 APR 15 MAY 12
XENIA APR 29 APR 15 MAY 12
..CENTRAL OHIO
CHILLICOTHE APR 22 APR 9 MAY 5
CIRCLEVILLE APR 30 APR 15 MAY 15
COLUMBUS APR 30 APR 15 MAY 15
DELAWARE MAY 3 APR 18 MAY 18
LANCASTER MAY 3 APR 20 MAY 16
LONDON MAY 2 APR 17 MAY 17
MARYSVILLE MAY 2 APR 17 MAY 17
NEWARK MAY 3 APR 18 MAY 19
WASHINGTON C.H. APR 26 APR 11 MAY 10
..WEST CENTRAL OH
BELLEFONTAINE MAY 3 APR 17 MAY 19
GREENVILLE MAY 3 APR 18 MAY 18
KENTON MAY 4 APR 20 MAY 18
SIDNEY MAY 5 APR 17 MAY 24
SPRINGFIELD APR 23 APR 8 MAY 9
URBANA MAY 3 APR 18 MAY 18
..SOUTH CENTRAL OH
PORTSMOUTH APR 14 APR 1 APR 26
WAVERLY MAY 3 APR 18 MAY 22
...KENTUCKY
CARROLLTON APR 21 APR 8 MAY 5
COVINGTON APR 21 APR 10 MAY 6
CYNTHIANA APR 25 APR 13 MAY 11
FALMOUTH APR 23 APR 11 MAY 21
MAYSVILLE APR 24 APR 2 MAY 9
WARSAW APR 27 APR 19 MAY 9
WILLIAMSTOWN APR 19 APR 6 MAY 5
..INDIANA
RICHMOND MAY 1 APR 14 MAY 18
VERSAILLES APR 28 APR 11 MAY 15
VEVAY APR 23 APR 6 MAY 10
FROST/FREEZE HEADLINES WILL BEGIN ACROSS MUCH OF THE TRI-STATE
AREA...NORTHERN KENTUCKY AND SOUTH CENTRAL OHIO ON APRIL 11TH.
THE MIAMI AND WHITEWATER VALLEY AND MUCH OF CENTRAL OHIO WILL BEGIN
ON APRIL 21ST. THE NORTHERN MIAMI VALLEY AND AREAS OF CENTRAL OHIO
NORTH OF COLUMBUS WILL BEGIN ON MAY 1ST.
A GRAPHICAL PRESENTATION ON THESE FROST/FREEZE START TIMES
WILL BE AVAILABLE AT OUR WEB SITE WWW.ERH.NOAA.GOV/ILN/ BY MONDAY,
APRIL 10TH.
$$
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