Hell, I run the air conditioning in the van when it 45 degrees outside and we're heading south facing the sun , my dog and I love it ...
Buy the wife something fleeced , that will help , maybe wool , she'll itch but won't complain about being cold ....
When I head south to Texas for the winter they are wearing coats at 65 degrees and I'm wearing t-shirts , they make fun of the Minnesota man and I give it right back to them , I tell them I'm not a snowbird , I'm a frostback and I like it cooler ...