Sound scale for weather (5)
I believe the answer is:
clime
'for weather' is the definition.
(thesaurus)
'sound scale' is the wordplay.
'sound' shows a homophone (sound like).
'scale' becomes 'climb' (I've seen this before).
'climb' sounds like 'CLIME'.
(Other definitions for clime that I've seen before include "Country, region" , "Region characterised by its general weather" .)