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.
We´ve had a mild autumn this year. Even early in November there was still leaves on many trees here in Oslo. But now it´s over and we´ve entered the transition phase between autumn and winter, which can be quite grey and dull photographically. But sometimes limitations can be the inspiration you need to try a little harder.