two weeks ago i used mi K110d near a river, in the fog, at night with near zero [celsius] temperature.
My precious is still alive and kickin'
The lesson i learnt is this: it's not extreme cold or wet the problem, it's the sudden change of ambiental condition the real problem! Finished shotting i went in a bar. In this case i turned the camera off and leave alone until slowly adapted to the temperature of the place: turning the camera on in these cases could be more dangerous than dropping it in a lake.
In a similar case you'll understand why looking the steam on the front lens element.
Then, AA batteries are heavily hit by cold and they won't last much: take spare batteries and keep them near your body to keep them a bit warm [but not too much].