drought vs wetness

drought

noun
  • A period of unusually low rainfall, longer and more severe than a dry spell. 

  • A longer than expected term without success, particularly in sport. 

wetness

noun
  • Moisture. 

  • Rainy or damp weather. 

  • The condition of being wet. 

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