The ice crystals you see in this image, form on the snow when the temperature varies between a few degrees plus and then drops below zero again. This is someting we normally see at the end of the winter, not late in December.
It has been a while since I've done any landscape photography now. But last week I drove across Haukeli along route E134. I took the opportunity to stop and take a few shots. The weather was nice. About 25°C even at 1000 meters above sea level. Just a slight breeze. It was quiet and peaceful.