Popular name for the period between the blossoming of the vine and the grape harvest; this is about three and a half months. In Central European latitudes this corresponds to the period from mid-May/early June to the end of August/mid-September. However, these 100 days should only be taken as a rule of thumb, as the actual duration depends on environmental conditions such as climate and weather, as well as the grape variety, and can be up to two weeks shorter/longer. See also the keywords ripening time, vegetation cycle and vineyard care.
For me, Lexicon from wein.plus is the most comprehensive and best source of information about wine currently available.Egon Mark
Diplom-Sommelier, Weinakademiker und Weinberater, Volders (Österreich)