I'm not very familiar with the climate in your area. Relative humidity is the critical factor. RH is typically fairly steady outdoors, but indoor humidity tends to be lowered when you heat or cool the space. The more extreme the outdoor temperatures are, the more your indoor air will tend to dry out when you flip on the heat or AC to make the house comfortable. When the RH drops the wood will shrink, only to re-expand when you switch the climate controls off.

I would shy away from solid wood slab doors, and if you were going to use frame and panel doors then I'd steer you away from mitered corner joints in those. Veneered slab doors should be okay, as should solid wood frame and panel doors with non-mitered corners. For flooring, a lot depends on the look you're going for. If you want a smooth and unbroken floor with planks tightly butted together without gaps then I'd think an engineered flooring would be a better choice. If you were going for a more rustic appearance where small gaps between the floorboards would be acceptable then I'd think solid wood flooring could work just fine.