National Weather Service Cleveland


Spring Thaw Dates



When does the last freeze of the season normally occur in your 
part of Ohio?
The following reference table will give an idea as to when the 
last freezing temperatures might occur... based on several years 
of climatological data... at each of the listed locations.
In the table that follows there are three columns which give the 
average date of the last 32 degree temperature in the spring... 
the date on which chances are one in ten that the last freeze 
will have occurred... and the date when the chances are nine in 
ten that the last freeze will have occurred.
location       ave date last  last 32f in one   last 32f in nine
               32f in spring  year out of ten   years out of ten
bowling green      may 2           apr 18             may 16
defiance           may 4           apr 19             may 18
findlay            apr 26          apr 14             may 9 
lima               may 4           apr 20             may 19
montpelier         may 5           apr 21             may 19
toledo             apr 27          apr 14             may 10
bucyrus            may 5           apr 21             may 19
elyria             may 4           apr 19             may 18
norwalk            may 3           apr 20             may 17
oberlin            may 13          apr 27             may 30
put-in-bay         apr 14          apr 4              apr 24
sandusky           apr 16          apr 4              apr 29
tiffin             apr 28          apr 17             may 10
ashtabula          may 2           apr 17             may 17
chardon            may 11          apr 25             may 27
cleveland          apr 21          apr 2              may 10
hiram              apr 30          apr 15             may 14
painesville        apr 26          apr 11             may 11
warren             may 14          apr 28             may 30
youngstown arpt    may 6           apr 19             may 24
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
circleville        apr 30          apr 15             may 15
columbus           apr 16          apr 3              apr 29
delaware           may 3           apr 18             may 18
lancaster          may 3           apr 20             may 16
london             may 2           apr 17             may 17
marion             apr 29          apr 13             may 15
marysville         may 2           apr 17             may 17
newark             may 3           apr 18             may 19
washington c.h.    apr 26          apr 11             may 10
ashland            may 4           apr 17             may 21
coshocton          may 6           apr 18             may 23
fredericktown      may 7           apr 24             may 19
mansfield          may 9           apr 25             may 23
millersburg        may 8           apr 23             may 23
plymouth           may 6           apr 22             may 21
wooster            may 8           apr 22             may 25
akron-canton arpt  may 3           apr 15             may 21
cadiz              apr 28          apr 13             may 14
canfield           may 14          apr 28             may 30
steubenville       apr 30          apr 15             may 16
cincinnati         apr 18          apr 3              may 3 
dayton             apr 19          apr 5              may 3
hamilton-fairfield apr 28          apr 14             may 11
hillsboro          apr 23          apr 9              may 7
milford            apr 30          apr 17             may 13
wilmington         may 2           apr 16             may 18
xenia              apr 29          apr 15             may 12
chillicothe        apr 22          apr 9              may 5
gallipolis         apr 30          apr 17             may 12
ironton            apr 21          apr 6              may 6 
jackson            may 8           apr 19             may 26
portsmouth         apr 14          apr 1              apr 26
waverly            may 5           apr 18             may 22
athens             may 16          may 1              may 31
barnesville        may 12          apr 26             may 29
caldwell           may 6           apr 19             may 23
cambridge          may 7           apr 20             may 23
marietta           apr 27          apr 13             may 12
mcconnelsville     may 5           apr 19             may 21
new lexington      may 7           apr 22             may 22
zanesville         may 6           apr 22             may 21
while the table above concerns itself only with the last recorded
freezing temperature in spring... we must add that frost can 
occur any time national weather service temperatures of 36 
degrees or less are recorded.  the reason for this apparent 
anomaly is that official temperature readings are taken at an 
elevation of five feet above ground... but the temperature at 
ground level may be colder.
on typical spring nights when frost occurs... the temperature at 
the five foot level may read 36 degrees while the temperature at 
ground level is actually the 32 degrees needed to form frost.