hibernal vs nippy

hibernal

adj
  • Of or pertaining to winter; brumal or hiemal 

nippy

adj
  • Of the weather, rather cold. 

  • fast; speedy 

  • Inclined to nip; bitey. 

  • sharp in taste 

  • curt 

  • annoying; irritating 

  • parsimonious 

How often have the words hibernal and nippy occurred in a corpus of books? (source: Google Ngram Viewer )