my neighbors have a very young cat (less than six months old, very small, doesn't weigh much, doesn't look healthy or well-fed, I guess) - how cold is too cold for a cat to be left out all night? It cries/whines to come in for hours and hours & it averages 20something degrees (or less) here at night ... they keep telling me that cats can take such weather (we are in the mountains so it also snows/rains/sleets at least half the time here) ... I keep banging on their door until they bring the cat "in" ... am I terribly wrong here?