I would guess the US would be much like it is here in Australia, and it would depend on when and where you are.
In summer if I leave the butter on the counter, I have a puddle of melted butter pretty quickly, but in winter I can leave it out just fine. Ketchup (and other tomato sauces) live in the cupboard, not the fridge. Eggs always go in the fridge. Avocado I don’t buy, as it tastes like soap to me.
