Join Date: Dec 2004
Location: Southern California
I live in one of the warmest areas of the country so I can't help with the temperature question, although if it's snowing I'd personally be concerned if they were my cats.
About the food - there's moisture in canned food, if that's what they're being fed daily, but if it's dry food, then they're probably not getting enough water to stay hydrated. (Cats die faster from dehydration than from starvation, I've read). Ideally, regardless of what they're being fed, there should always be a bowl of fresh water available for them.
Oh, I just saw the rest of your post. Cats are known for finding refuge from the cold in and around cars, in wheel wells, underneath the car, elsewhere in the car. That's why people who have outdoor cats take care (or should) to check their cars before starting the car and driving off. Cats have also been found under the hoods of car and trucks.
They can also take refuge under decks and patios, and under the houses themselves.
*this space not for sale*