Что имеется в виду под "frost": ледяные порывы или снег?

В контексте:

A warm fire crackled beside Rainbow Dash as she sat on an open ledge facing the east horizon. The blizzard had stopped, but several swift winds pelted the mountains with brief frost. She had to re-kindle the fire at least three times, but it didn't matter to her. Rainbow was prepared to spend the entire night underneath the stars. After all, she had had her fill of closed-in spaces.