If they have made their choice to go out earlier than you thought it was because they wanted to. If they were cold they would go back in. As long as they can get in and out easily, trust their judgement. It is hard when you have lost livestock, but I think we all have, and it does knock your confidence. My goats like being inside, whereas a friend from my village also has goats, but his are always out, even in the rain. Have you had anymore snow? We have had non stop snow for about 36 hours and measures about 20 inches not including the stuff thats drifting. its boring now so much extra work.