brass monkeys vs wintry

brass monkeys

adj
  • very cold 

wintry

adj
  • Suggestive or characteristic of winter; cold, stormy. 

  • Containing sleet or snow. 

  • Aged, white-haired. 

  • Chilling, cheerless. 

  • a wintry remark 

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