affirmation vs rain or shine

affirmation

noun
  • A form of self-forced meditation or repetition; autosuggestion. 

  • That which is affirmed; a declaration that something is true. 

  • The solemn declaration made by Quakers and others incapable of taking an oath. 

rain or shine

adv
  • Regardless of what the circumstances are, and how the weather is. 

How often have the words affirmation and rain or shine occurred in a corpus of books? (source: Google Ngram Viewer )