Not necessarily. Alsace-Lorraine and Switzerland are mountainous, and weather can be pretty variable in the hills. It'd be useful as a general guide, and it's a clever idea, but there's still the possibility of rain catching them suddenly on the road, so they would need to be prepared for the eventuality.

(Also, she would fret inwardly about it regardless. :)

--G.
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Benjamin D. Hutchins, Co-Founder, Editor-in-Chief, & Forum Mod
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