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'Diurnal temperature variation' is a viticultural term that relates to the variation in temperature that occurs from the highs of the day to the cool of nights. Wine regions situated in areas of high altitude experience the most dramatic swing in temperature variation during the course of a day. In grapes this variation has the effect of producing high acid and high sugar contents as the grapes' exposure to sunlight increases the ripening qualities while the sudden drop in temperature at night preserves the balance of natural acids in the grape.^[1]

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References

References

1. J. Robinson ''"The Oxford Companion to Wine"'' Third Edition pg 691 Oxford University Press 2006 ISBN 0198609906