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Diurnal temperature range

The diurnal temperature range (in short: diurnal range) is the maximal difference in temperature between day and night. Wine regions with a large diurnal temperature range often produce more balanced wines. The warm daytime conditions produce sugar in the grapes, whereas the cool nights preserve the fresh acids and aromas. A larger diurnal range is seen in wine regions that have an inland location or a high elevation. In contrast, large water bodies such as a river, lake or oceans buffer temperature fluctuations which results in a smaller diurnal temperature range (but they do protect against frost damage).


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