A person purchasing grain may not use any measure for the grain other than the standard bushel, and a number of pounds may not be used or called a bushel other than the number of pounds provided by law as the standard weight of the kind of grain in question, except that during the months of October and November, not exceeding eighty-two pounds [37.19 kilograms], and during the months of December and January, not exceeding seventy-six pounds [34.47 kilograms], may be used as the standard weight per bushel of new ear corn.