Grape vines are incredibly intolerant of harsh spring frosts during the budding season. Without buds, no flowers, and then no grapes.
Major cooling events, such as those which accompany a Grand Solar Minimum can be seen throughout history.
For example, prior to the Late Antique Little Ice Age, 585-640AD and after 50AD, it was sufficiently warm to grow grapes and harvest on south facing slopes in the English Roman province.
https://www.iceagenow.info/collapse-in-wine-production-was-to-be-expected/?fbclid=IwA
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