Sorry, Bernard, but when I worked up north, if the temperature was below -35 deg C we wouldn't work because the equipment would freeze up, but if it was -32 with a windchill of -60 or -70, it was just another 12 hour day. -10 is pretty close to T-shirt weather!
Mike.
P.S. Wim: excellent work, as usual, although the one above and the Berdorf images in general are my favourites...