erratic vs weathery

erratic

adj
  • Unsteady, random; prone to unexpected changes; not consistent. 

  • Deviating from normal opinions or actions; eccentric; odd. 

noun
  • A rock moved from one location to another, usually by a glacier. 

  • Anything that has erratic characteristics. 

weathery

adj
  • Subject to frequent changes (of direction or fortune, for example). 

  • Lacking in flavour as a result of the leaves having been harvested during mid-season rains. 

  • Accompanied by or featuring wind and/or precipitation. 

  • Worn or otherwise affected by weather; (of a person's features or body) showing signs of age or wear. 

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