title_body: How can I talk about weather without expletives? In English, it is necessary to use a syntactic expletive ("it") when talking about weather:
  
  It   is     sun-ny.
  EXPL COP.3S sun-ADJ
  
  
  Pro-drop languages can easily avoid the explicit expletive by excluding it (Spanish):
  
  Hac-e sol.
  do-3S sun
  
  
  But in this Spanish example, there's still an implicit expletive subject. How can I completely avoid using expletive subject when talking about the weather?
upvoted_answer: There are also language with impersonal verb conjugation, and of course, nothing prevents a verb from being used only in the impersonal. Nahuatl has an impersonal voice, but because it's only used with verbs that normally have animate subjects, its weather verbs function much like Spanish's, ironically enough.
  
  In my own conlang Mfalen, weather verbs function as descriptors, so one says the equivalent of "X is raining" (i.e. It's raining on/in X) the same way one says "X is cold" or "X is windy" (or indeed, "X is red").