frigid vs hibernal

frigid

adj
  • Very cold; lacking warmth; icy. 

  • Chilly in manner; lacking affection or zeal; impassive. 

  • Sexually unresponsive, especially of a woman. 

hibernal

adj
  • Of or pertaining to winter; brumal or hiemal 

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