Bruce,
I lived in Norway from 1990 to 1994. I remember getting up one morning in December just before Christmas and looking outside to see the air sparkling with ice crystals and all the trees frosted over. It seems we had a inversion overnight and the temperature had dropped some 20 degrees in the night hours from just above freezing to well below. Any moisture in the air became frost and stuck to any surface it could find. It was on that morning that I truly came to understand what the expression 'it's a dry cold' really meant. It also brought a whole new meaning to a white Christmas.

Regards from the desert of Nevada,
Bob Ainsworth OTMCS (Ret.)