Cats can survive the cold except their ears are vunerable to frost bite. This is one of the things seen with outside cats in Saskatchewan. He does, of course, need food as fuel to keep warm. Cats often prefer water from strange places. Cats come on to my sundeck to lick at puddles. They seem to prefer rain water.
When I was feeding Hey Cat, he came to my back door through six inches of snow, although it doesn't get quite as cold here in Vancouver as it does in Ontario.
I do seem to recall that cats are kept at some Antarctic stations, but I doubt they're left outside all night. (Can you imagine what it must be like to walk around down there in bare feet?)
Can you provide some sort of shelter? A cardboard box covered with plastic might serve. If it was up againts the house, radiant heat might provide some comfort.
Last edited by jusjim; 10-23-2012 at 01:23 PM.