We are not a family that does well in temperatures above the high 20s. Usually, we don't go further South than half-way down France, although the French Alps were fine last summer and we're risking the Italian Lakes this year (with air con!). But I've been googling average maximum temperatures and these suggest that Northern Spain is much cooler than Southern France. I kind of understand how that can be the case (maritime rather than continental climate) but I can't quite believe it somehow! Some of the reviews of places in Galicia I've been reading on HomeAway talk about it being very hot, but of course that could be unusual. So I guess partly I'm asking strangers on the internet to reassure me with personal experiences, rather than trusting rigorously collected systematic data
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But also, which parts of Northern Spain would you particularly recommend? Not sure how we'd get there yet but we'd probably fly because the ferry looks really expensive. Possibly ferry one way and drive back through France the other? But we don't mind driving several hours to get to our destination. The adults like beautiful views, remote countryside and walks on the doorstep, the children like more touristy settings with everything nearby and minimal driving to get to attractions (so we're never going to please everyone).